# Trait serde_json::value::Index

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    pub trait Index: Sealed { }

Expand description

A type that can be used to index into a `serde_json::Value`.

The `get` and `get_mut` methods of `Value` accept any type that implements `Index`, as does the square-bracket indexing operator. This trait is implemented for strings which are used as the index into a JSON map, and for `usize` which is used as the index into a JSON array.

This trait is sealed and cannot be implemented for types outside of `serde_json`.

## Examples

    let data = json!({ "inner": [1, 2, 3] });

    // Data is a JSON map so it can be indexed with a string.
    let inner = &data["inner"];

    // Inner is a JSON array so it can be indexed with an integer.
    let first = &inner[0];

    assert_eq!(first, 1);

## Implementations on Foreign Types

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### impl Index for usize

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### impl Index for str

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### impl Index for String

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### impl<'a, T> Index for &'a T where
T: ?Sized + Index,

## Implementors