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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."><title>json in serde_json - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="serde_json" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.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]--><rustdoc-topbar><h2><a href="#">json</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../serde_json/index.html">serde_<wbr>json</a><span class="version">1.0.149</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">serde_json</a></div><h1>Macro <span class="macro">json</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/serde_json/macros.rs.html#54-59">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! json {
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($($json:tt)+) => { ... };
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}</code></pre><details class="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>value = <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"
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</span>],
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<span class="string">"homepage"</span>: null
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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 an 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>code = <span class="number">200</span>;
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<span class="kw">let </span>features = <span class="macro">vec!</span>[<span class="string">"serde"</span>, <span class="string">"json"</span>];
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<span class="kw">let </span>value = <span class="macro">json!</span>({
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<span class="string">"code"</span>: code,
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<span class="string">"success"</span>: code == <span class="number">200</span>,
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<span class="string">"payload"</span>: {
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features[<span class="number">0</span>]: features[<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>value = <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></div></details></section></div></main></body></html> |