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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">☰</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">−</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> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">json</span>:<span class="ident">tt</span>)<span class="op">+</span>) => { ... };
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}</code></pre></div>
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</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>
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<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>({
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<span class="string">"code"</span>: <span class="number">200</span>,
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<span class="string">"success"</span>: <span class="bool-val">true</span>,
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<span class="string">"payload"</span>: {
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<span class="string">"features"</span>: [
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<span class="string">"serde"</span>,
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<span class="string">"json"</span>
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]
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}
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});</code></pre></div>
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<p>Variables or expressions can be interpolated into the JSON literal. Any type
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interpolated into an array element or object value must implement Serde’s
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<code>Serialize</code> trait, while any type interpolated into a object key must
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implement <code>Into<String></code>. If the <code>Serialize</code> implementation of the
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interpolated type decides to fail, or if the interpolated type contains a
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map with non-string keys, the <code>json!</code> macro will panic.</p>
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<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>;
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<span class="kw">let</span> <span class="ident">features</span> <span class="op">=</span> <span class="macro">vec!</span>[<span class="string">"serde"</span>, <span class="string">"json"</span>];
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<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json!</span>({
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<span class="string">"code"</span>: <span class="ident">code</span>,
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<span class="string">"success"</span>: <span class="ident">code</span> <span class="op">==</span> <span class="number">200</span>,
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<span class="string">"payload"</span>: {
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<span class="ident">features</span>[<span class="number">0</span>]: <span class="ident">features</span>[<span class="number">1</span>]
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}
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});</code></pre></div>
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<p>Trailing commas are allowed inside both arrays and objects.</p>
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<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>([
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<span class="string">"notice"</span>,
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<span class="string">"the"</span>,
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<span class="string">"trailing"</span>,
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<span class="string">"comma -->"</span>,
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]);</code></pre></div>
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