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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deserialize an instance of type `T` from an IO stream of JSON."><meta name="keywords" content="rust, rustlang, rust-lang, from_reader"><title>from_reader in serde_json::de - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json::de</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">serde_json</a>::<wbr><a href="index.html">de</a>::<wbr><a class="fn" href="#">from_reader</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/de.rs.html#2516-2522">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_reader&lt;R, T&gt;(rdr: R) -&gt; <a class="type" href="../type.Result.html" title="type serde_json::Result">Result</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/1.64.0/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../serde/de/trait.DeserializeOwned.html" title="trait serde::de::DeserializeOwned">DeserializeOwned</a>,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deserialize an instance of type <code>T</code> from an IO stream of JSON.</p>
<p>The content of the IO stream is deserialized directly from the stream
without being buffered in memory by serde_json.</p>
<p>When reading from a source against which short reads are not efficient, such
as a <a href="https://doc.rust-lang.org/std/fs/struct.File.html"><code>File</code></a>, you will want to apply your own buffering because serde_json
will not buffer the input. See <a href="https://doc.rust-lang.org/std/io/struct.BufReader.html"><code>std::io::BufReader</code></a>.</p>
<p>It is expected that the input stream ends after the deserialized object.
If the stream does not end, such as in the case of a persistent socket connection,
this function will not return. It is possible instead to deserialize from a prefix of an input
stream without looking for EOF by managing your own <a href="../struct.Deserializer.html" title="Deserializer"><code>Deserializer</code></a>.</p>
<p>Note that counter to intuition, this function is usually slower than
reading a file completely into memory and then applying <a href="./fn.from_str.html"><code>from_str</code></a>
or <a href="./fn.from_slice.html"><code>from_slice</code></a> on it. See <a href="https://github.com/serde-rs/json/issues/160">issue #160</a>.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<p>Reading the contents of a file.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="kw">use</span> <span class="ident">std::error::Error</span>;
<span class="kw">use</span> <span class="ident">std::fs::File</span>;
<span class="kw">use</span> <span class="ident">std::io::BufReader</span>;
<span class="kw">use</span> <span class="ident">std::path::Path</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">read_user_from_file</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">Path</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">path</span>: <span class="ident">P</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">User</span>, <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Error</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="comment">// Open the file in read-only mode with buffer.</span>
<span class="kw">let</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File::open</span>(<span class="ident">path</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader::new</span>(<span class="ident">file</span>);
<span class="comment">// Read the JSON contents of the file as an instance of `User`.</span>
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">serde_json::from_reader</span>(<span class="ident">reader</span>)<span class="question-mark">?</span>;
<span class="comment">// Return the `User`.</span>
<span class="prelude-val">Ok</span>(<span class="ident">u</span>)
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">read_user_from_file</span>(<span class="string">&quot;test.json&quot;</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<p>Reading from a persistent socket connection.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="kw">use</span> <span class="ident">std::error::Error</span>;
<span class="kw">use</span> <span class="ident">std::net</span>::{<span class="ident">TcpListener</span>, <span class="ident">TcpStream</span>};
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">read_user_from_stream</span>(<span class="ident">tcp_stream</span>: <span class="ident">TcpStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">User</span>, <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Error</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de</span> <span class="op">=</span> <span class="ident">serde_json::Deserializer::from_reader</span>(<span class="ident">tcp_stream</span>);
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">User::deserialize</span>(<span class="kw-2">&amp;mut</span> <span class="ident">de</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">u</span>)
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">listener</span> <span class="op">=</span> <span class="ident">TcpListener::bind</span>(<span class="string">&quot;127.0.0.1:4000&quot;</span>).<span class="ident">unwrap</span>();
<span class="kw">for</span> <span class="ident">stream</span> <span class="kw">in</span> <span class="ident">listener</span>.<span class="ident">incoming</span>() {
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">read_user_from_stream</span>(<span class="ident">stream</span>.<span class="ident">unwrap</span>()));
}
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the input does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the input
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deserialize an instance of type `T` from bytes of JSON text."><meta name="keywords" content="rust, rustlang, rust-lang, from_slice"><title>from_slice in serde_json::de - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json::de</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">serde_json</a>::<wbr><a href="index.html">de</a>::<wbr><a class="fn" href="#">from_slice</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/de.rs.html#2559-2564">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_slice&lt;'a, T&gt;(v: &amp;'a [<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>]) -&gt; <a class="type" href="../type.Result.html" title="type serde_json::Result">Result</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../serde/de/trait.Deserialize.html" title="trait serde::de::Deserialize">Deserialize</a>&lt;'a&gt;,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deserialize an instance of type <code>T</code> from bytes of JSON text.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `j` is `&amp;[u8]`</span>
<span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <span class="string">b&quot;
{
\&quot;fingerprint\&quot;: \&quot;0xF9BA143B95FF6D82\&quot;,
\&quot;location\&quot;: \&quot;Menlo Park, CA\&quot;
}&quot;</span>;
<span class="kw">let</span> <span class="ident">u</span>: <span class="ident">User</span> <span class="op">=</span> <span class="ident">serde_json::from_slice</span>(<span class="ident">j</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the input does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the input
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deserialize an instance of type `T` from a string of JSON text."><meta name="keywords" content="rust, rustlang, rust-lang, from_str"><title>from_str in serde_json::de - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json::de</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">serde_json</a>::<wbr><a href="index.html">de</a>::<wbr><a class="fn" href="#">from_str</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/de.rs.html#2601-2606">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_str&lt;'a, T&gt;(s: &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a>) -&gt; <a class="type" href="../type.Result.html" title="type serde_json::Result">Result</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../serde/de/trait.Deserialize.html" title="trait serde::de::Deserialize">Deserialize</a>&lt;'a&gt;,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deserialize an instance of type <code>T</code> from a string of JSON text.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `j` is `&amp;str`</span>
<span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <span class="string">&quot;
{
\&quot;fingerprint\&quot;: \&quot;0xF9BA143B95FF6D82\&quot;,
\&quot;location\&quot;: \&quot;Menlo Park, CA\&quot;
}&quot;</span>;
<span class="kw">let</span> <span class="ident">u</span>: <span class="ident">User</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="ident">j</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the input does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the input
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deserialize JSON data to a Rust data structure."><meta name="keywords" content="rust, rustlang, rust-lang, de"><title>serde_json::de - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Module de</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div></section></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">serde_json</a>::<wbr><a class="mod" href="#">de</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/de.rs.html#1-2606">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deserialize JSON data to a Rust data structure.</p>
</div></details><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Deserializer.html" title="serde_json::de::Deserializer struct">Deserializer</a></div><div class="item-right docblock-short"><p>A structure that deserializes JSON into Rust values.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.IoRead.html" title="serde_json::de::IoRead struct">IoRead</a></div><div class="item-right docblock-short"><p>JSON input source that reads from a std::io input stream.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.SliceRead.html" title="serde_json::de::SliceRead struct">SliceRead</a></div><div class="item-right docblock-short"><p>JSON input source that reads from a slice of bytes.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.StrRead.html" title="serde_json::de::StrRead struct">StrRead</a></div><div class="item-right docblock-short"><p>JSON input source that reads from a UTF-8 string.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.StreamDeserializer.html" title="serde_json::de::StreamDeserializer struct">StreamDeserializer</a></div><div class="item-right docblock-short"><p>Iterator that deserializes a stream into multiple JSON values.</p>
</div></div></div><h2 id="traits" class="small-section-header"><a href="#traits">Traits</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="trait" href="trait.Read.html" title="serde_json::de::Read trait">Read</a></div><div class="item-right docblock-short"><p>Trait used by the deserializer for iterating over input. This is manually
“specialized” for iterating over &amp;<a href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html" title="u8">u8</a>. Once feature(specialization) is
stable we can use actual specialization.</p>
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_reader.html" title="serde_json::de::from_reader fn">from_reader</a></div><div class="item-right docblock-short"><p>Deserialize an instance of type <code>T</code> from an IO stream of JSON.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_slice.html" title="serde_json::de::from_slice fn">from_slice</a></div><div class="item-right docblock-short"><p>Deserialize an instance of type <code>T</code> from bytes of JSON text.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_str.html" title="serde_json::de::from_str fn">from_str</a></div><div class="item-right docblock-short"><p>Deserialize an instance of type <code>T</code> from a string of JSON text.</p>
</div></div></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Trait used by the deserializer for iterating over input. This is manually “specialized” for iterating over &amp;[u8]. Once feature(specialization) is stable we can use actual specialization."><meta name="keywords" content="rust, rustlang, rust-lang, Read"><title>Read in serde_json::de - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Read</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul><li><a href="#impl-Read%3C%27de%3E-for-%26%27a%20mut%20R">&amp;&#39;a mut R</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div></section><h2 class="location"><a href="index.html">In serde_json::de</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Trait <a href="../index.html">serde_json</a>::<wbr><a href="index.html">de</a>::<wbr><a class="trait" href="#">Read</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/read.rs.html#26-115">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust trait"><code>pub trait Read&lt;'de&gt;: Sealed { }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Trait used by the deserializer for iterating over input. This is manually
“specialized” for iterating over &amp;<a href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html" title="u8">u8</a>. Once feature(specialization) is
stable we can use actual specialization.</p>
<p>This trait is sealed and cannot be implemented for types outside of
<code>serde_json</code>.</p>
</div></details><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><section id="impl-Read%3C%27de%3E-for-%26%27a%20mut%20R" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/read.rs.html#711-776">source</a></span><a href="#impl-Read%3C%27de%3E-for-%26%27a%20mut%20R" class="anchor"></a><h3 class="code-header in-band">impl&lt;'a, 'de, R&gt; <a class="trait" href="trait.Read.html" title="trait serde_json::de::Read">Read</a>&lt;'de&gt; for <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&amp;'a mut </a>R <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="trait.Read.html" title="trait serde_json::de::Read">Read</a>&lt;'de&gt;,&nbsp;</span></h3></section><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><section id="impl-Read%3C%27a%3E-for-SliceRead%3C%27a%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/read.rs.html#487-613">source</a></span><a href="#impl-Read%3C%27a%3E-for-SliceRead%3C%27a%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;'a&gt; <a class="trait" href="trait.Read.html" title="trait serde_json::de::Read">Read</a>&lt;'a&gt; for <a class="struct" href="struct.SliceRead.html" title="struct serde_json::de::SliceRead">SliceRead</a>&lt;'a&gt;</h3></section><section id="impl-Read%3C%27a%3E-for-StrRead%3C%27a%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/read.rs.html#630-705">source</a></span><a href="#impl-Read%3C%27a%3E-for-StrRead%3C%27a%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;'a&gt; <a class="trait" href="trait.Read.html" title="trait serde_json::de::Read">Read</a>&lt;'a&gt; for <a class="struct" href="struct.StrRead.html" title="struct serde_json::de::StrRead">StrRead</a>&lt;'a&gt;</h3></section><section id="impl-Read%3C%27de%3E-for-IoRead%3CR%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/read.rs.html#245-400">source</a></span><a href="#impl-Read%3C%27de%3E-for-IoRead%3CR%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;'de, R&gt; <a class="trait" href="trait.Read.html" title="trait serde_json::de::Read">Read</a>&lt;'de&gt; for <a class="struct" href="struct.IoRead.html" title="struct serde_json::de::IoRead">IoRead</a>&lt;R&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/1.64.0/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,&nbsp;</span></h3></section></div><script type="text/javascript" src="../../implementors/serde_json/read/trait.Read.js" data-ignore-extern-crates="" async></script></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="When serializing or deserializing JSON goes wrong."><meta name="keywords" content="rust, rustlang, rust-lang, error"><title>serde_json::error - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Module error</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#types">Type Definitions</a></li></ul></div></section></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">serde_json</a>::<wbr><a class="mod" href="#">error</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/error.rs.html#1-445">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>When serializing or deserializing JSON goes wrong.</p>
</div></details><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Error.html" title="serde_json::error::Error struct">Error</a></div><div class="item-right docblock-short"><p>This type represents all possible errors that can occur when serializing or
deserializing JSON data.</p>
</div></div></div><h2 id="enums" class="small-section-header"><a href="#enums">Enums</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="enum" href="enum.Category.html" title="serde_json::error::Category enum">Category</a></div><div class="item-right docblock-short"><p>Categorizes the cause of a <code>serde_json::Error</code>.</p>
</div></div></div><h2 id="types" class="small-section-header"><a href="#types">Type Definitions</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="type" href="type.Result.html" title="serde_json::error::Result type">Result</a></div><div class="item-right docblock-short"><p>Alias for a <code>Result</code> with the error type <code>serde_json::Error</code>.</p>
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</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deserialize an instance of type `T` from an IO stream of JSON."><meta name="keywords" content="rust, rustlang, rust-lang, from_reader"><title>from_reader in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="index.html">serde_json</a>::<wbr><a class="fn" href="#">from_reader</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/de.rs.html#2516-2522">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_reader&lt;R, T&gt;(rdr: R) -&gt; <a class="type" href="type.Result.html" title="type serde_json::Result">Result</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/1.64.0/std/io/trait.Read.html" title="trait std::io::Read">Read</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../serde/de/trait.DeserializeOwned.html" title="trait serde::de::DeserializeOwned">DeserializeOwned</a>,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deserialize an instance of type <code>T</code> from an IO stream of JSON.</p>
<p>The content of the IO stream is deserialized directly from the stream
without being buffered in memory by serde_json.</p>
<p>When reading from a source against which short reads are not efficient, such
as a <a href="https://doc.rust-lang.org/std/fs/struct.File.html"><code>File</code></a>, you will want to apply your own buffering because serde_json
will not buffer the input. See <a href="https://doc.rust-lang.org/std/io/struct.BufReader.html"><code>std::io::BufReader</code></a>.</p>
<p>It is expected that the input stream ends after the deserialized object.
If the stream does not end, such as in the case of a persistent socket connection,
this function will not return. It is possible instead to deserialize from a prefix of an input
stream without looking for EOF by managing your own <a href="struct.Deserializer.html" title="Deserializer"><code>Deserializer</code></a>.</p>
<p>Note that counter to intuition, this function is usually slower than
reading a file completely into memory and then applying <a href="./fn.from_str.html"><code>from_str</code></a>
or <a href="./fn.from_slice.html"><code>from_slice</code></a> on it. See <a href="https://github.com/serde-rs/json/issues/160">issue #160</a>.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<p>Reading the contents of a file.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="kw">use</span> <span class="ident">std::error::Error</span>;
<span class="kw">use</span> <span class="ident">std::fs::File</span>;
<span class="kw">use</span> <span class="ident">std::io::BufReader</span>;
<span class="kw">use</span> <span class="ident">std::path::Path</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">read_user_from_file</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">Path</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">path</span>: <span class="ident">P</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">User</span>, <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Error</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="comment">// Open the file in read-only mode with buffer.</span>
<span class="kw">let</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File::open</span>(<span class="ident">path</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader::new</span>(<span class="ident">file</span>);
<span class="comment">// Read the JSON contents of the file as an instance of `User`.</span>
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">serde_json::from_reader</span>(<span class="ident">reader</span>)<span class="question-mark">?</span>;
<span class="comment">// Return the `User`.</span>
<span class="prelude-val">Ok</span>(<span class="ident">u</span>)
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">read_user_from_file</span>(<span class="string">&quot;test.json&quot;</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<p>Reading from a persistent socket connection.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="kw">use</span> <span class="ident">std::error::Error</span>;
<span class="kw">use</span> <span class="ident">std::net</span>::{<span class="ident">TcpListener</span>, <span class="ident">TcpStream</span>};
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">read_user_from_stream</span>(<span class="ident">tcp_stream</span>: <span class="ident">TcpStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">User</span>, <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Error</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de</span> <span class="op">=</span> <span class="ident">serde_json::Deserializer::from_reader</span>(<span class="ident">tcp_stream</span>);
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">User::deserialize</span>(<span class="kw-2">&amp;mut</span> <span class="ident">de</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">u</span>)
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">listener</span> <span class="op">=</span> <span class="ident">TcpListener::bind</span>(<span class="string">&quot;127.0.0.1:4000&quot;</span>).<span class="ident">unwrap</span>();
<span class="kw">for</span> <span class="ident">stream</span> <span class="kw">in</span> <span class="ident">listener</span>.<span class="ident">incoming</span>() {
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">read_user_from_stream</span>(<span class="ident">stream</span>.<span class="ident">unwrap</span>()));
}
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the input does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the input
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deserialize an instance of type `T` from bytes of JSON text."><meta name="keywords" content="rust, rustlang, rust-lang, from_slice"><title>from_slice in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="index.html">serde_json</a>::<wbr><a class="fn" href="#">from_slice</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/de.rs.html#2559-2564">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_slice&lt;'a, T&gt;(v: &amp;'a [<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>]) -&gt; <a class="type" href="type.Result.html" title="type serde_json::Result">Result</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../serde/de/trait.Deserialize.html" title="trait serde::de::Deserialize">Deserialize</a>&lt;'a&gt;,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deserialize an instance of type <code>T</code> from bytes of JSON text.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `j` is `&amp;[u8]`</span>
<span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <span class="string">b&quot;
{
\&quot;fingerprint\&quot;: \&quot;0xF9BA143B95FF6D82\&quot;,
\&quot;location\&quot;: \&quot;Menlo Park, CA\&quot;
}&quot;</span>;
<span class="kw">let</span> <span class="ident">u</span>: <span class="ident">User</span> <span class="op">=</span> <span class="ident">serde_json::from_slice</span>(<span class="ident">j</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the input does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the input
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deserialize an instance of type `T` from a string of JSON text."><meta name="keywords" content="rust, rustlang, rust-lang, from_str"><title>from_str in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="index.html">serde_json</a>::<wbr><a class="fn" href="#">from_str</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/de.rs.html#2601-2606">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_str&lt;'a, T&gt;(s: &amp;'a <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a>) -&gt; <a class="type" href="type.Result.html" title="type serde_json::Result">Result</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../serde/de/trait.Deserialize.html" title="trait serde::de::Deserialize">Deserialize</a>&lt;'a&gt;,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deserialize an instance of type <code>T</code> from a string of JSON text.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `j` is `&amp;str`</span>
<span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <span class="string">&quot;
{
\&quot;fingerprint\&quot;: \&quot;0xF9BA143B95FF6D82\&quot;,
\&quot;location\&quot;: \&quot;Menlo Park, CA\&quot;
}&quot;</span>;
<span class="kw">let</span> <span class="ident">u</span>: <span class="ident">User</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="ident">j</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the input does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the input
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Interpret a `serde_json::Value` as an instance of type `T`."><meta name="keywords" content="rust, rustlang, rust-lang, from_value"><title>from_value in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="index.html">serde_json</a>::<wbr><a class="fn" href="#">from_value</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/value/mod.rs.html#982-987">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_value&lt;T&gt;(value: <a class="enum" href="enum.Value.html" title="enum serde_json::Value">Value</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, <a class="struct" href="struct.Error.html" title="struct serde_json::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../serde/de/trait.DeserializeOwned.html" title="trait serde::de::DeserializeOwned">DeserializeOwned</a>,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Interpret a <code>serde_json::Value</code> as an instance of type <code>T</code>.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="kw">use</span> <span class="ident">serde_json::json</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `j` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;fingerprint&quot;</span>: <span class="string">&quot;0xF9BA143B95FF6D82&quot;</span>,
<span class="string">&quot;location&quot;</span>: <span class="string">&quot;Menlo Park, CA&quot;</span>
});
<span class="kw">let</span> <span class="ident">u</span>: <span class="ident">User</span> <span class="op">=</span> <span class="ident">serde_json::from_value</span>(<span class="ident">j</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the Value does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the Value
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Convert a `T` into `serde_json::Value` which is an enum that can represent any valid JSON data."><meta name="keywords" content="rust, rustlang, rust-lang, to_value"><title>to_value in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="index.html">serde_json</a>::<wbr><a class="fn" href="#">to_value</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/value/mod.rs.html#940-945">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn to_value&lt;T&gt;(value: T) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="enum.Value.html" title="enum serde_json::Value">Value</a>, <a class="struct" href="struct.Error.html" title="struct serde_json::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../serde/ser/trait.Serialize.html" title="trait serde::ser::Serialize">Serialize</a>,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Convert a <code>T</code> into <code>serde_json::Value</code> which is an enum that can represent
any valid JSON data.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Serialize</span>;
<span class="kw">use</span> <span class="ident">serde_json::json</span>;
<span class="kw">use</span> <span class="ident">std::error::Error</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">compare_json_values</span>() -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Error</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="string">&quot;0xF9BA143B95FF6D82&quot;</span>.<span class="ident">to_owned</span>(),
<span class="ident">location</span>: <span class="string">&quot;Menlo Park, CA&quot;</span>.<span class="ident">to_owned</span>(),
};
<span class="comment">// The type of `expected` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;fingerprint&quot;</span>: <span class="string">&quot;0xF9BA143B95FF6D82&quot;</span>,
<span class="string">&quot;location&quot;</span>: <span class="string">&quot;Menlo Park, CA&quot;</span>,
});
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">serde_json::to_value</span>(<span class="ident">u</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, <span class="ident">expected</span>);
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">std::collections::BTreeMap</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The keys in this map are vectors, not strings.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">BTreeMap::new</span>();
<span class="ident">map</span>.<span class="ident">insert</span>(<span class="macro">vec!</span>[<span class="number">32</span>, <span class="number">64</span>], <span class="string">&quot;x86&quot;</span>);
<span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">serde_json::to_value</span>(<span class="ident">map</span>).<span class="ident">unwrap_err</span>());
}</code></pre></div>
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<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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stream.</p>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Serde JSON"><meta name="keywords" content="rust, rustlang, rust-lang, serde_json"><title>serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="../crates.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Crate serde_json</a></h2><div class="sidebar-elems"><div class="block"><ul><li class="version">Version 1.0.91</li><li><a id="all-types" href="all.html">All Items</a></li></ul></div><section><div class="block"><ul><li><a href="#modules">Modules</a></li><li><a href="#macros">Macros</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#functions">Functions</a></li><li><a href="#types">Type Definitions</a></li></ul></div></section></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Crate <a class="mod" href="#">serde_json</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/lib.rs.html#1-421">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><h2 id="serde-json"><a href="#serde-json">Serde JSON</a></h2>
<p>JSON is a ubiquitous open-standard format that uses human-readable text to
transmit data objects consisting of key-value pairs.</p>
<div class="example-wrap"><pre class="language-json"><code>{
&quot;name&quot;: &quot;John Doe&quot;,
&quot;age&quot;: 43,
&quot;address&quot;: {
&quot;street&quot;: &quot;10 Downing Street&quot;,
&quot;city&quot;: &quot;London&quot;
},
&quot;phones&quot;: [
&quot;+44 1234567&quot;,
&quot;+44 2345678&quot;
]
}</code></pre></div>
<p>There are three common ways that you might find yourself needing to work
with JSON data in Rust.</p>
<ul>
<li><strong>As text data.</strong> An unprocessed string of JSON data that you receive on
an HTTP endpoint, read from a file, or prepare to send to a remote
server.</li>
<li><strong>As an untyped or loosely typed representation.</strong> Maybe you want to
check that some JSON data is valid before passing it on, but without
knowing the structure of what it contains. Or you want to do very basic
manipulations like insert a key in a particular spot.</li>
<li><strong>As a strongly typed Rust data structure.</strong> When you expect all or most
of your data to conform to a particular structure and want to get real
work done without JSON’s loosey-goosey nature tripping you up.</li>
</ul>
<p>Serde JSON provides efficient, flexible, safe ways of converting data
between each of these representations.</p>
<h2 id="operating-on-untyped-json-values"><a href="#operating-on-untyped-json-values">Operating on untyped JSON values</a></h2>
<p>Any valid JSON data can be manipulated in the following recursive enum
representation. This data structure is <a href="https://docs.serde.rs/serde_json/value/enum.Value.html"><code>serde_json::Value</code></a>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">enum</span> <span class="ident">Value</span> {
<span class="ident">Null</span>,
<span class="ident">Bool</span>(<span class="ident">bool</span>),
<span class="ident">Number</span>(<span class="ident">Number</span>),
<span class="ident">String</span>(<span class="ident">String</span>),
<span class="ident">Array</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Value</span><span class="op">&gt;</span>),
<span class="ident">Object</span>(<span class="ident">Map</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">Value</span><span class="op">&gt;</span>),
}</code></pre></div>
<p>A string of JSON data can be parsed into a <code>serde_json::Value</code> by the
<a href="https://docs.serde.rs/serde_json/de/fn.from_str.html"><code>serde_json::from_str</code></a> function. There is also
<a href="https://docs.serde.rs/serde_json/de/fn.from_slice.html"><code>from_slice</code></a> for parsing from a byte slice &amp;<a href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html" title="u8">u8</a> and
<a href="https://docs.serde.rs/serde_json/de/fn.from_reader.html"><code>from_reader</code></a> for parsing from any <code>io::Read</code> like a File or
a TCP stream.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde_json</span>::{<span class="prelude-ty">Result</span>, <span class="ident">Value</span>};
<span class="kw">fn</span> <span class="ident">untyped_example</span>() -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="comment">// Some JSON input data as a &amp;str. Maybe this comes from the user.</span>
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="string">r#&quot;
{
&quot;name&quot;: &quot;John Doe&quot;,
&quot;age&quot;: 43,
&quot;phones&quot;: [
&quot;+44 1234567&quot;,
&quot;+44 2345678&quot;
]
}&quot;#</span>;
<span class="comment">// Parse the string of data into serde_json::Value.</span>
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Value</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="ident">data</span>)<span class="question-mark">?</span>;
<span class="comment">// Access parts of the data by indexing with square brackets.</span>
<span class="macro">println!</span>(<span class="string">&quot;Please call {} at the number {}&quot;</span>, <span class="ident">v</span>[<span class="string">&quot;name&quot;</span>], <span class="ident">v</span>[<span class="string">&quot;phones&quot;</span>][<span class="number">0</span>]);
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
<p>The result of square bracket indexing like <code>v[&quot;name&quot;]</code> is a borrow of the
data at that index, so the type is <code>&amp;Value</code>. A JSON map can be indexed with
string keys, while a JSON array can be indexed with integer keys. If the
type of the data is not right for the type with which it is being indexed,
or if a map does not contain the key being indexed, or if the index into a
vector is out of bounds, the returned element is <code>Value::Null</code>.</p>
<p>When a <code>Value</code> is printed, it is printed as a JSON string. So in the code
above, the output looks like <code>Please call &quot;John Doe&quot; at the number &quot;+44 1234567&quot;</code>. The quotation marks appear because <code>v[&quot;name&quot;]</code> is a <code>&amp;Value</code>
containing a JSON string and its JSON representation is <code>&quot;John Doe&quot;</code>.
Printing as a plain string without quotation marks involves converting from
a JSON string to a Rust string with <a href="https://docs.serde.rs/serde_json/enum.Value.html#method.as_str"><code>as_str()</code></a> or avoiding the use of
<code>Value</code> as described in the following section.</p>
<p>The <code>Value</code> representation is sufficient for very basic tasks but can be
tedious to work with for anything more significant. Error handling is
verbose to implement correctly, for example imagine trying to detect the
presence of unrecognized fields in the input data. The compiler is powerless
to help you when you make a mistake, for example imagine typoing <code>v[&quot;name&quot;]</code>
as <code>v[&quot;nmae&quot;]</code> in one of the dozens of places it is used in your code.</p>
<h2 id="parsing-json-as-strongly-typed-data-structures"><a href="#parsing-json-as-strongly-typed-data-structures">Parsing JSON as strongly typed data structures</a></h2>
<p>Serde provides a powerful way of mapping JSON data into Rust data structures
largely automatically.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};
<span class="kw">use</span> <span class="ident">serde_json::Result</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">struct</span> <span class="ident">Person</span> {
<span class="ident">name</span>: <span class="ident">String</span>,
<span class="ident">age</span>: <span class="ident">u8</span>,
<span class="ident">phones</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}
<span class="kw">fn</span> <span class="ident">typed_example</span>() -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="comment">// Some JSON input data as a &amp;str. Maybe this comes from the user.</span>
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="string">r#&quot;
{
&quot;name&quot;: &quot;John Doe&quot;,
&quot;age&quot;: 43,
&quot;phones&quot;: [
&quot;+44 1234567&quot;,
&quot;+44 2345678&quot;
]
}&quot;#</span>;
<span class="comment">// Parse the string of data into a Person object. This is exactly the</span>
<span class="comment">// same function as the one that produced serde_json::Value above, but</span>
<span class="comment">// now we are asking it for a Person as output.</span>
<span class="kw">let</span> <span class="ident">p</span>: <span class="ident">Person</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="ident">data</span>)<span class="question-mark">?</span>;
<span class="comment">// Do things just like with any other Rust data structure.</span>
<span class="macro">println!</span>(<span class="string">&quot;Please call {} at the number {}&quot;</span>, <span class="ident">p</span>.<span class="ident">name</span>, <span class="ident">p</span>.<span class="ident">phones</span>[<span class="number">0</span>]);
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
<p>This is the same <code>serde_json::from_str</code> function as before, but this time we
assign the return value to a variable of type <code>Person</code> so Serde will
automatically interpret the input data as a <code>Person</code> and produce informative
error messages if the layout does not conform to what a <code>Person</code> is expected
to look like.</p>
<p>Any type that implements Serde’s <code>Deserialize</code> trait can be deserialized
this way. This includes built-in Rust standard library types like <code>Vec&lt;T&gt;</code>
and <code>HashMap&lt;K, V&gt;</code>, as well as any structs or enums annotated with
<code>#[derive(Deserialize)]</code>.</p>
<p>Once we have <code>p</code> of type <code>Person</code>, our IDE and the Rust compiler can help us
use it correctly like they do for any other Rust code. The IDE can
autocomplete field names to prevent typos, which was impossible in the
<code>serde_json::Value</code> representation. And the Rust compiler can check that
when we write <code>p.phones[0]</code>, then <code>p.phones</code> is guaranteed to be a
<code>Vec&lt;String&gt;</code> so indexing into it makes sense and produces a <code>String</code>.</p>
<h2 id="constructing-json-values"><a href="#constructing-json-values">Constructing JSON values</a></h2>
<p>Serde JSON provides a <a href="https://docs.serde.rs/serde_json/macro.json.html"><code>json!</code> macro</a> to build <code>serde_json::Value</code>
objects with very natural JSON syntax.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde_json::json</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `john` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">john</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;name&quot;</span>: <span class="string">&quot;John Doe&quot;</span>,
<span class="string">&quot;age&quot;</span>: <span class="number">43</span>,
<span class="string">&quot;phones&quot;</span>: [
<span class="string">&quot;+44 1234567&quot;</span>,
<span class="string">&quot;+44 2345678&quot;</span>
]
});
<span class="macro">println!</span>(<span class="string">&quot;first phone number: {}&quot;</span>, <span class="ident">john</span>[<span class="string">&quot;phones&quot;</span>][<span class="number">0</span>]);
<span class="comment">// Convert to a string of JSON and print it out</span>
<span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">john</span>.<span class="ident">to_string</span>());
}</code></pre></div>
<p>The <code>Value::to_string()</code> function converts a <code>serde_json::Value</code> into a
<code>String</code> of JSON text.</p>
<p>One neat thing about the <code>json!</code> macro is that variables and expressions can
be interpolated directly into the JSON value as you are building it. Serde
will check at compile time that the value you are interpolating is able to
be represented as JSON.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">full_name</span> <span class="op">=</span> <span class="string">&quot;John Doe&quot;</span>;
<span class="kw">let</span> <span class="ident">age_last_year</span> <span class="op">=</span> <span class="number">42</span>;
<span class="comment">// The type of `john` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">john</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;name&quot;</span>: <span class="ident">full_name</span>,
<span class="string">&quot;age&quot;</span>: <span class="ident">age_last_year</span> <span class="op">+</span> <span class="number">1</span>,
<span class="string">&quot;phones&quot;</span>: [
<span class="macro">format!</span>(<span class="string">&quot;+44 {}&quot;</span>, <span class="ident">random_phone</span>())
]
});</code></pre></div>
<p>This is amazingly convenient, but we have the problem we had before with
<code>Value</code>: the IDE and Rust compiler cannot help us if we get it wrong. Serde
JSON provides a better way of serializing strongly-typed data structures
into JSON text.</p>
<h2 id="creating-json-by-serializing-data-structures"><a href="#creating-json-by-serializing-data-structures">Creating JSON by serializing data structures</a></h2>
<p>A data structure can be converted to a JSON string by
<a href="https://docs.serde.rs/serde_json/ser/fn.to_string.html"><code>serde_json::to_string</code></a>. There is also
<a href="https://docs.serde.rs/serde_json/ser/fn.to_vec.html"><code>serde_json::to_vec</code></a> which serializes to a <code>Vec&lt;u8&gt;</code> and
<a href="https://docs.serde.rs/serde_json/ser/fn.to_writer.html"><code>serde_json::to_writer</code></a> which serializes to any <code>io::Write</code>
such as a File or a TCP stream.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};
<span class="kw">use</span> <span class="ident">serde_json::Result</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">struct</span> <span class="ident">Address</span> {
<span class="ident">street</span>: <span class="ident">String</span>,
<span class="ident">city</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">print_an_address</span>() -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="comment">// Some data structure.</span>
<span class="kw">let</span> <span class="ident">address</span> <span class="op">=</span> <span class="ident">Address</span> {
<span class="ident">street</span>: <span class="string">&quot;10 Downing Street&quot;</span>.<span class="ident">to_owned</span>(),
<span class="ident">city</span>: <span class="string">&quot;London&quot;</span>.<span class="ident">to_owned</span>(),
};
<span class="comment">// Serialize it to a JSON string.</span>
<span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <span class="ident">serde_json::to_string</span>(<span class="kw-2">&amp;</span><span class="ident">address</span>)<span class="question-mark">?</span>;
<span class="comment">// Print, write to a file, or send to an HTTP server.</span>
<span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">j</span>);
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
<p>Any type that implements Serde’s <code>Serialize</code> trait can be serialized this
way. This includes built-in Rust standard library types like <code>Vec&lt;T&gt;</code> and
<code>HashMap&lt;K, V&gt;</code>, as well as any structs or enums annotated with
<code>#[derive(Serialize)]</code>.</p>
<h2 id="no-std-support"><a href="#no-std-support">No-std support</a></h2>
<p>As long as there is a memory allocator, it is possible to use serde_json
without the rest of the Rust standard library. Disable the default “std”
feature and enable the “alloc” feature:</p>
<div class="example-wrap"><pre class="language-toml"><code>[dependencies]
serde_json = { version = &quot;1.0&quot;, default-features = false, features = [&quot;alloc&quot;] }</code></pre></div>
<p>For JSON support in Serde without a memory allocator, please see the
<a href="https://github.com/rust-embedded-community/serde-json-core"><code>serde-json-core</code></a> crate.</p>
</div></details><h2 id="modules" class="small-section-header"><a href="#modules">Modules</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="mod" href="de/index.html" title="serde_json::de mod">de</a></div><div class="item-right docblock-short"><p>Deserialize JSON data to a Rust data structure.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="error/index.html" title="serde_json::error mod">error</a></div><div class="item-right docblock-short"><p>When serializing or deserializing JSON goes wrong.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="map/index.html" title="serde_json::map mod">map</a></div><div class="item-right docblock-short"><p>A map of String to serde_json::Value.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="ser/index.html" title="serde_json::ser mod">ser</a></div><div class="item-right docblock-short"><p>Serialize a Rust data structure into JSON data.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="value/index.html" title="serde_json::value mod">value</a></div><div class="item-right docblock-short"><p>The Value enum, a loosely typed way of representing any valid JSON value.</p>
</div></div></div><h2 id="macros" class="small-section-header"><a href="#macros">Macros</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="macro" href="macro.json.html" title="serde_json::json macro">json</a></div><div class="item-right docblock-short"><p>Construct a <code>serde_json::Value</code> from a JSON literal.</p>
</div></div></div><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Deserializer.html" title="serde_json::Deserializer struct">Deserializer</a></div><div class="item-right docblock-short"><p>A structure that deserializes JSON into Rust values.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Error.html" title="serde_json::Error struct">Error</a></div><div class="item-right docblock-short"><p>This type represents all possible errors that can occur when serializing or
deserializing JSON data.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Map.html" title="serde_json::Map struct">Map</a></div><div class="item-right docblock-short"><p>Represents a JSON key/value type.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Number.html" title="serde_json::Number struct">Number</a></div><div class="item-right docblock-short"><p>Represents a JSON number, whether integer or floating point.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Serializer.html" title="serde_json::Serializer struct">Serializer</a></div><div class="item-right docblock-short"><p>A structure for serializing Rust values into JSON.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.StreamDeserializer.html" title="serde_json::StreamDeserializer struct">StreamDeserializer</a></div><div class="item-right docblock-short"><p>Iterator that deserializes a stream into multiple JSON values.</p>
</div></div></div><h2 id="enums" class="small-section-header"><a href="#enums">Enums</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="enum" href="enum.Value.html" title="serde_json::Value enum">Value</a></div><div class="item-right docblock-short"><p>Represents any valid JSON value.</p>
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_reader.html" title="serde_json::from_reader fn">from_reader</a></div><div class="item-right docblock-short"><p>Deserialize an instance of type <code>T</code> from an IO stream of JSON.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_slice.html" title="serde_json::from_slice fn">from_slice</a></div><div class="item-right docblock-short"><p>Deserialize an instance of type <code>T</code> from bytes of JSON text.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_str.html" title="serde_json::from_str fn">from_str</a></div><div class="item-right docblock-short"><p>Deserialize an instance of type <code>T</code> from a string of JSON text.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_value.html" title="serde_json::from_value fn">from_value</a></div><div class="item-right docblock-short"><p>Interpret a <code>serde_json::Value</code> as an instance of type <code>T</code>.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_string.html" title="serde_json::to_string fn">to_string</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a String of JSON.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_string_pretty.html" title="serde_json::to_string_pretty fn">to_string_pretty</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a pretty-printed String of JSON.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_value.html" title="serde_json::to_value fn">to_value</a></div><div class="item-right docblock-short"><p>Convert a <code>T</code> into <code>serde_json::Value</code> which is an enum that can represent
any valid JSON data.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_vec.html" title="serde_json::to_vec fn">to_vec</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a JSON byte vector.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_vec_pretty.html" title="serde_json::to_vec_pretty fn">to_vec_pretty</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a pretty-printed JSON byte vector.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_writer.html" title="serde_json::to_writer fn">to_writer</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as JSON into the IO stream.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_writer_pretty.html" title="serde_json::to_writer_pretty fn">to_writer_pretty</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as pretty-printed JSON into the IO
stream.</p>
</div></div></div><h2 id="types" class="small-section-header"><a href="#types">Type Definitions</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="type" href="type.Result.html" title="serde_json::Result type">Result</a></div><div class="item-right docblock-short"><p>Alias for a <code>Result</code> with the error type <code>serde_json::Error</code>.</p>
</div></div></div></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Construct a `serde_json::Value` from a JSON literal."><meta name="keywords" content="rust, rustlang, rust-lang, json"><title>json in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Macro <a href="index.html">serde_json</a>::<wbr><a class="macro" href="#">json</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/macros.rs.html#53-58">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><div class="example-wrap"><pre class="rust macro"><code><span class="macro">macro_rules!</span> <span class="ident">json</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">json</span>:<span class="ident">tt</span>)<span class="op">+</span>) =&gt; { ... };
}</code></pre></div>
</div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Construct a <code>serde_json::Value</code> from a JSON literal.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;code&quot;</span>: <span class="number">200</span>,
<span class="string">&quot;success&quot;</span>: <span class="bool-val">true</span>,
<span class="string">&quot;payload&quot;</span>: {
<span class="string">&quot;features&quot;</span>: [
<span class="string">&quot;serde&quot;</span>,
<span class="string">&quot;json&quot;</span>
]
}
});</code></pre></div>
<p>Variables or expressions can be interpolated into the JSON literal. Any type
interpolated into an array element or object value must implement Serde’s
<code>Serialize</code> trait, while any type interpolated into a object key must
implement <code>Into&lt;String&gt;</code>. If the <code>Serialize</code> implementation of the
interpolated type decides to fail, or if the interpolated type contains a
map with non-string keys, the <code>json!</code> macro will panic.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="number">200</span>;
<span class="kw">let</span> <span class="ident">features</span> <span class="op">=</span> <span class="macro">vec!</span>[<span class="string">&quot;serde&quot;</span>, <span class="string">&quot;json&quot;</span>];
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;code&quot;</span>: <span class="ident">code</span>,
<span class="string">&quot;success&quot;</span>: <span class="ident">code</span> <span class="op">==</span> <span class="number">200</span>,
<span class="string">&quot;payload&quot;</span>: {
<span class="ident">features</span>[<span class="number">0</span>]: <span class="ident">features</span>[<span class="number">1</span>]
}
});</code></pre></div>
<p>Trailing commas are allowed inside both arrays and objects.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json!</span>([
<span class="string">&quot;notice&quot;</span>,
<span class="string">&quot;the&quot;</span>,
<span class="string">&quot;trailing&quot;</span>,
<span class="string">&quot;comma --&gt;&quot;</span>,
]);</code></pre></div>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A map of String to serde_json::Value."><meta name="keywords" content="rust, rustlang, rust-lang, map"><title>serde_json::map - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Module map</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li></ul></div></section></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">serde_json</a>::<wbr><a class="mod" href="#">map</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/map.rs.html#1-940">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A map of String to serde_json::Value.</p>
<p>By default the map is backed by a <a href="https://doc.rust-lang.org/std/collections/struct.BTreeMap.html"><code>BTreeMap</code></a>. Enable the <code>preserve_order</code>
feature of serde_json to use <a href="https://docs.rs/indexmap/*/indexmap/map/struct.IndexMap.html"><code>IndexMap</code></a> instead.</p>
</div></details><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.IntoIter.html" title="serde_json::map::IntoIter struct">IntoIter</a></div><div class="item-right docblock-short"><p>An owning iterator over a serde_json::Map’s entries.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Iter.html" title="serde_json::map::Iter struct">Iter</a></div><div class="item-right docblock-short"><p>An iterator over a serde_json::Map’s entries.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.IterMut.html" title="serde_json::map::IterMut struct">IterMut</a></div><div class="item-right docblock-short"><p>A mutable iterator over a serde_json::Map’s entries.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Keys.html" title="serde_json::map::Keys struct">Keys</a></div><div class="item-right docblock-short"><p>An iterator over a serde_json::Map’s keys.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Map.html" title="serde_json::map::Map struct">Map</a></div><div class="item-right docblock-short"><p>Represents a JSON key/value type.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.OccupiedEntry.html" title="serde_json::map::OccupiedEntry struct">OccupiedEntry</a></div><div class="item-right docblock-short"><p>An occupied Entry. It is part of the <a href="enum.Entry.html"><code>Entry</code></a> enum.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.VacantEntry.html" title="serde_json::map::VacantEntry struct">VacantEntry</a></div><div class="item-right docblock-short"><p>A vacant Entry. It is part of the <a href="enum.Entry.html"><code>Entry</code></a> enum.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Values.html" title="serde_json::map::Values struct">Values</a></div><div class="item-right docblock-short"><p>An iterator over a serde_json::Map’s values.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.ValuesMut.html" title="serde_json::map::ValuesMut struct">ValuesMut</a></div><div class="item-right docblock-short"><p>A mutable iterator over a serde_json::Map’s values.</p>
</div></div></div><h2 id="enums" class="small-section-header"><a href="#enums">Enums</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="enum" href="enum.Entry.html" title="serde_json::map::Entry enum">Entry</a></div><div class="item-right docblock-short"><p>A view into a single entry in a map, which may either be vacant or occupied.
This enum is constructed from the <a href="struct.Map.html#method.entry"><code>entry</code></a> method on <a href="struct.Map.html"><code>Map</code></a>.</p>
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Serialize the given data structure as a String of JSON."><meta name="keywords" content="rust, rustlang, rust-lang, to_string"><title>to_string in serde_json::ser - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json::ser</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">serde_json</a>::<wbr><a href="index.html">ser</a>::<wbr><a class="fn" href="#">to_string</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/ser.rs.html#2139-2149">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn to_string&lt;T&gt;(value: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&amp;</a>T) -&gt; <a class="type" href="../type.Result.html" title="type serde_json::Result">Result</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../serde/ser/trait.Serialize.html" title="trait serde::ser::Serialize">Serialize</a>,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Serialize the given data structure as a String of JSON.</p>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>Serialization can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Serialize a Rust data structure into JSON data."><meta name="keywords" content="rust, rustlang, rust-lang, ser"><title>serde_json::ser - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Module ser</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div></section></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">serde_json</a>::<wbr><a class="mod" href="#">ser</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/ser.rs.html#1-2179">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Serialize a Rust data structure into JSON data.</p>
</div></details><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.CompactFormatter.html" title="serde_json::ser::CompactFormatter struct">CompactFormatter</a></div><div class="item-right docblock-short"><p>This structure compacts a JSON value with no extra whitespace.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.PrettyFormatter.html" title="serde_json::ser::PrettyFormatter struct">PrettyFormatter</a></div><div class="item-right docblock-short"><p>This structure pretty prints a JSON value to make it human readable.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Serializer.html" title="serde_json::ser::Serializer struct">Serializer</a></div><div class="item-right docblock-short"><p>A structure for serializing Rust values into JSON.</p>
</div></div></div><h2 id="enums" class="small-section-header"><a href="#enums">Enums</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="enum" href="enum.CharEscape.html" title="serde_json::ser::CharEscape enum">CharEscape</a></div><div class="item-right docblock-short"><p>Represents a character escape code in a type-safe manner.</p>
</div></div></div><h2 id="traits" class="small-section-header"><a href="#traits">Traits</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="trait" href="trait.Formatter.html" title="serde_json::ser::Formatter trait">Formatter</a></div><div class="item-right docblock-short"><p>This trait abstracts away serializing the JSON control characters, which allows the user to
optionally pretty print the JSON output.</p>
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_string.html" title="serde_json::ser::to_string fn">to_string</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a String of JSON.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_string_pretty.html" title="serde_json::ser::to_string_pretty fn">to_string_pretty</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a pretty-printed String of JSON.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_vec.html" title="serde_json::ser::to_vec fn">to_vec</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a JSON byte vector.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_vec_pretty.html" title="serde_json::ser::to_vec_pretty fn">to_vec_pretty</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as a pretty-printed JSON byte vector.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_writer.html" title="serde_json::ser::to_writer fn">to_writer</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as JSON into the IO stream.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_writer_pretty.html" title="serde_json::ser::to_writer_pretty fn">to_writer_pretty</a></div><div class="item-right docblock-short"><p>Serialize the given data structure as pretty-printed JSON into the IO
stream.</p>
</div></div></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Alias for a `Result` with the error type `serde_json::Error`."><meta name="keywords" content="rust, rustlang, rust-lang, Result"><title>Result in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc type"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Result</a></h2><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde_json/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Type Definition <a href="index.html">serde_json</a>::<wbr><a class="type" href="#">Result</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/serde_json/error.rs.html#23">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust typedef"><code>pub type Result&lt;T&gt; = <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, <a class="struct" href="struct.Error.html" title="struct serde_json::Error">Error</a>&gt;;</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Alias for a <code>Result</code> with the error type <code>serde_json::Error</code>.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Interpret a `serde_json::Value` as an instance of type `T`."><meta name="keywords" content="rust, rustlang, rust-lang, from_value"><title>from_value in serde_json::value - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json::value</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">serde_json</a>::<wbr><a href="index.html">value</a>::<wbr><a class="fn" href="#">from_value</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/value/mod.rs.html#982-987">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn from_value&lt;T&gt;(value: <a class="enum" href="../enum.Value.html" title="enum serde_json::Value">Value</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, <a class="struct" href="../struct.Error.html" title="struct serde_json::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../serde/de/trait.DeserializeOwned.html" title="trait serde::de::DeserializeOwned">DeserializeOwned</a>,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Interpret a <code>serde_json::Value</code> as an instance of type <code>T</code>.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Deserialize</span>;
<span class="kw">use</span> <span class="ident">serde_json::json</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `j` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;fingerprint&quot;</span>: <span class="string">&quot;0xF9BA143B95FF6D82&quot;</span>,
<span class="string">&quot;location&quot;</span>: <span class="string">&quot;Menlo Park, CA&quot;</span>
});
<span class="kw">let</span> <span class="ident">u</span>: <span class="ident">User</span> <span class="op">=</span> <span class="ident">serde_json::from_value</span>(<span class="ident">j</span>).<span class="ident">unwrap</span>();
<span class="macro">println!</span>(<span class="string">&quot;{:#?}&quot;</span>, <span class="ident">u</span>);
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if the structure of the Value does not match the
structure expected by <code>T</code>, for example if <code>T</code> is a struct type but the Value
contains something other than a JSON map. It can also fail if the structure
is correct but <code>T</code>’s implementation of <code>Deserialize</code> decides that something
is wrong with the data, for example required struct fields are missing from
the JSON map or some number is too big to fit in the expected primitive
type.</p>
</div></details></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Convert a `T` into `serde_json::Value` which is an enum that can represent any valid JSON data."><meta name="keywords" content="rust, rustlang, rust-lang, to_value"><title>to_value in serde_json::value - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In serde_json::value</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">serde_json</a>::<wbr><a href="index.html">value</a>::<wbr><a class="fn" href="#">to_value</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/value/mod.rs.html#940-945">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn to_value&lt;T&gt;(value: T) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="../enum.Value.html" title="enum serde_json::Value">Value</a>, <a class="struct" href="../struct.Error.html" title="struct serde_json::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../serde/ser/trait.Serialize.html" title="trait serde::ser::Serialize">Serialize</a>,&nbsp;</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Convert a <code>T</code> into <code>serde_json::Value</code> which is an enum that can represent
any valid JSON data.</p>
<h2 id="example"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde::Serialize</span>;
<span class="kw">use</span> <span class="ident">serde_json::json</span>;
<span class="kw">use</span> <span class="ident">std::error::Error</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>)]</span>
<span class="kw">struct</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="ident">String</span>,
<span class="ident">location</span>: <span class="ident">String</span>,
}
<span class="kw">fn</span> <span class="ident">compare_json_values</span>() -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Error</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">User</span> {
<span class="ident">fingerprint</span>: <span class="string">&quot;0xF9BA143B95FF6D82&quot;</span>.<span class="ident">to_owned</span>(),
<span class="ident">location</span>: <span class="string">&quot;Menlo Park, CA&quot;</span>.<span class="ident">to_owned</span>(),
};
<span class="comment">// The type of `expected` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;fingerprint&quot;</span>: <span class="string">&quot;0xF9BA143B95FF6D82&quot;</span>,
<span class="string">&quot;location&quot;</span>: <span class="string">&quot;Menlo Park, CA&quot;</span>,
});
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">serde_json::to_value</span>(<span class="ident">u</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq!</span>(<span class="ident">v</span>, <span class="ident">expected</span>);
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
<h2 id="errors"><a href="#errors">Errors</a></h2>
<p>This conversion can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
fail, or if <code>T</code> contains a map with non-string keys.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">std::collections::BTreeMap</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The keys in this map are vectors, not strings.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">BTreeMap::new</span>();
<span class="ident">map</span>.<span class="ident">insert</span>(<span class="macro">vec!</span>[<span class="number">32</span>, <span class="number">64</span>], <span class="string">&quot;x86&quot;</span>);
<span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">serde_json::to_value</span>(<span class="ident">map</span>).<span class="ident">unwrap_err</span>());
}</code></pre></div>
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="The Value enum, a loosely typed way of representing any valid JSON value."><meta name="keywords" content="rust, rustlang, rust-lang, value"><title>serde_json::value - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Module value</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#reexports">Re-exports</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div></section></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">serde_json</a>::<wbr><a class="mod" href="#">value</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/value/mod.rs.html#1-987">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>The Value enum, a loosely typed way of representing any valid JSON value.</p>
<h2 id="constructing-json"><a href="#constructing-json">Constructing JSON</a></h2>
<p>Serde JSON provides a <a href="https://docs.serde.rs/serde_json/macro.json.html"><code>json!</code> macro</a> to build <code>serde_json::Value</code>
objects with very natural JSON syntax.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde_json::json</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// The type of `john` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">john</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;name&quot;</span>: <span class="string">&quot;John Doe&quot;</span>,
<span class="string">&quot;age&quot;</span>: <span class="number">43</span>,
<span class="string">&quot;phones&quot;</span>: [
<span class="string">&quot;+44 1234567&quot;</span>,
<span class="string">&quot;+44 2345678&quot;</span>
]
});
<span class="macro">println!</span>(<span class="string">&quot;first phone number: {}&quot;</span>, <span class="ident">john</span>[<span class="string">&quot;phones&quot;</span>][<span class="number">0</span>]);
<span class="comment">// Convert to a string of JSON and print it out</span>
<span class="macro">println!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">john</span>.<span class="ident">to_string</span>());
}</code></pre></div>
<p>The <code>Value::to_string()</code> function converts a <code>serde_json::Value</code> into a
<code>String</code> of JSON text.</p>
<p>One neat thing about the <code>json!</code> macro is that variables and expressions can
be interpolated directly into the JSON value as you are building it. Serde
will check at compile time that the value you are interpolating is able to
be represented as JSON.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">full_name</span> <span class="op">=</span> <span class="string">&quot;John Doe&quot;</span>;
<span class="kw">let</span> <span class="ident">age_last_year</span> <span class="op">=</span> <span class="number">42</span>;
<span class="comment">// The type of `john` is `serde_json::Value`</span>
<span class="kw">let</span> <span class="ident">john</span> <span class="op">=</span> <span class="macro">json!</span>({
<span class="string">&quot;name&quot;</span>: <span class="ident">full_name</span>,
<span class="string">&quot;age&quot;</span>: <span class="ident">age_last_year</span> <span class="op">+</span> <span class="number">1</span>,
<span class="string">&quot;phones&quot;</span>: [
<span class="macro">format!</span>(<span class="string">&quot;+44 {}&quot;</span>, <span class="ident">random_phone</span>())
]
});</code></pre></div>
<p>A string of JSON data can be parsed into a <code>serde_json::Value</code> by the
<a href="https://docs.serde.rs/serde_json/de/fn.from_str.html"><code>serde_json::from_str</code></a> function. There is also
<a href="https://docs.serde.rs/serde_json/de/fn.from_slice.html"><code>from_slice</code></a> for parsing from a byte slice <code>&amp;[u8]</code> and
<a href="https://docs.serde.rs/serde_json/de/fn.from_reader.html"><code>from_reader</code></a> for parsing from any <code>io::Read</code> like a File or
a TCP stream.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">serde_json</span>::{<span class="ident">json</span>, <span class="ident">Value</span>, <span class="ident">Error</span>};
<span class="kw">fn</span> <span class="ident">untyped_example</span>() -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
<span class="comment">// Some JSON input data as a &amp;str. Maybe this comes from the user.</span>
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="string">r#&quot;
{
&quot;name&quot;: &quot;John Doe&quot;,
&quot;age&quot;: 43,
&quot;phones&quot;: [
&quot;+44 1234567&quot;,
&quot;+44 2345678&quot;
]
}&quot;#</span>;
<span class="comment">// Parse the string of data into serde_json::Value.</span>
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Value</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="ident">data</span>)<span class="question-mark">?</span>;
<span class="comment">// Access parts of the data by indexing with square brackets.</span>
<span class="macro">println!</span>(<span class="string">&quot;Please call {} at the number {}&quot;</span>, <span class="ident">v</span>[<span class="string">&quot;name&quot;</span>], <span class="ident">v</span>[<span class="string">&quot;phones&quot;</span>][<span class="number">0</span>]);
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
</div></details><h2 id="reexports" class="small-section-header"><a href="#reexports">Re-exports</a></h2><div class="item-table"><div class="item-row"><div class="item-left import-item" id="reexport.Map"><code>pub use crate::map::<a class="struct" href="../struct.Map.html" title="struct serde_json::Map">Map</a>;</code></div><div class="item-right docblock-short"></div></div></div><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Number.html" title="serde_json::value::Number struct">Number</a></div><div class="item-right docblock-short"><p>Represents a JSON number, whether integer or floating point.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Serializer.html" title="serde_json::value::Serializer struct">Serializer</a></div><div class="item-right docblock-short"><p>Serializer whose output is a <code>Value</code>.</p>
</div></div></div><h2 id="enums" class="small-section-header"><a href="#enums">Enums</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="enum" href="enum.Value.html" title="serde_json::value::Value enum">Value</a></div><div class="item-right docblock-short"><p>Represents any valid JSON value.</p>
</div></div></div><h2 id="traits" class="small-section-header"><a href="#traits">Traits</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="trait" href="trait.Index.html" title="serde_json::value::Index trait">Index</a></div><div class="item-right docblock-short"><p>A type that can be used to index into a <code>serde_json::Value</code>.</p>
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.from_value.html" title="serde_json::value::from_value fn">from_value</a></div><div class="item-right docblock-short"><p>Interpret a <code>serde_json::Value</code> as an instance of type <code>T</code>.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.to_value.html" title="serde_json::value::to_value fn">to_value</a></div><div class="item-right docblock-short"><p>Convert a <code>T</code> into <code>serde_json::Value</code> which is an enum that can represent
any valid JSON data.</p>
</div></div></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A type that can be used to index into a `serde_json::Value`."><meta name="keywords" content="rust, rustlang, rust-lang, Index"><title>Index in serde_json::value - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Index</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul><li><a href="#impl-Index-for-%26%27a%20T">&amp;&#39;a T</a></li><li><a href="#impl-Index-for-String">String</a></li><li><a href="#impl-Index-for-str">str</a></li><li><a href="#impl-Index-for-usize">usize</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div></section><h2 class="location"><a href="index.html">In serde_json::value</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde_json/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Trait <a href="../index.html">serde_json</a>::<wbr><a href="index.html">value</a>::<wbr><a class="trait" href="#">Index</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/serde_json/value/index.rs.html#37-52">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust trait"><code>pub trait Index: Sealed { }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A type that can be used to index into a <code>serde_json::Value</code>.</p>
<p>The <a href="../enum.Value.html#method.get"><code>get</code></a> and <a href="../enum.Value.html#method.get_mut"><code>get_mut</code></a> methods of <code>Value</code> accept any type that
implements <code>Index</code>, as does the <a href="../enum.Value.html#impl-Index%3CI%3E">square-bracket indexing operator</a>. This
trait is implemented for strings which are used as the index into a JSON
map, and for <code>usize</code> which is used as the index into a JSON array.</p>
<p>This trait is sealed and cannot be implemented for types outside of
<code>serde_json</code>.</p>
<h2 id="examples"><a href="#examples">Examples</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="macro">json!</span>({ <span class="string">&quot;inner&quot;</span>: [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>] });
<span class="comment">// Data is a JSON map so it can be indexed with a string.</span>
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">data</span>[<span class="string">&quot;inner&quot;</span>];
<span class="comment">// Inner is a JSON array so it can be indexed with an integer.</span>
<span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">inner</span>[<span class="number">0</span>];
<span class="macro">assert_eq!</span>(<span class="ident">first</span>, <span class="number">1</span>);</code></pre></div>
</div></details><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><section id="impl-Index-for-usize" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#54-81">source</a></span><a href="#impl-Index-for-usize" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.usize.html">usize</a></h3></section><section id="impl-Index-for-str" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#83-105">source</a></span><a href="#impl-Index-for-str" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a></h3></section><section id="impl-Index-for-String" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#107-117">source</a></span><a href="#impl-Index-for-String" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h3></section><section id="impl-Index-for-%26%27a%20T" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde_json/value/index.rs.html#119-132">source</a></span><a href="#impl-Index-for-%26%27a%20T" class="anchor"></a><h3 class="code-header in-band">impl&lt;'a, T&gt; <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a> for <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&amp;'a </a>T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.Index.html" title="trait serde_json::value::Index">Index</a>,&nbsp;</span></h3></section><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"></div><script type="text/javascript" src="../../implementors/serde_json/value/index/trait.Index.js" data-ignore-extern-crates="std,alloc" async></script></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>