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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."><title>to_value in serde_json - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.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="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.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">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../serde_json/index.html">serde_json</a><span class="version">1.0.107</span></h2></div><div class="sidebar-elems"></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../serde_json/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Function <a href="index.html">serde_json</a>::<wbr><a class="fn" href="#">to_value</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/serde_json/value/mod.rs.html#961-966">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub fn to_value<T>(value: T) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<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>><div class="where">where
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T: <a class="trait" href="../serde/ser/trait.Serialize.html" title="trait serde::ser::Serialize">Serialize</a>,</div></code></pre><details class="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
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any valid JSON data.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>serde::Serialize;
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<span class="kw">use </span>serde_json::json;
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<span class="kw">use </span>std::error::Error;
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<span class="attr">#[derive(Serialize)]
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</span><span class="kw">struct </span>User {
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fingerprint: String,
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location: String,
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}
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<span class="kw">fn </span>compare_json_values() -> <span class="prelude-ty">Result</span><(), Box<<span class="kw">dyn </span>Error>> {
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<span class="kw">let </span>u = User {
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fingerprint: <span class="string">"0xF9BA143B95FF6D82"</span>.to_owned(),
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location: <span class="string">"Menlo Park, CA"</span>.to_owned(),
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};
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<span class="comment">// The type of `expected` is `serde_json::Value`
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</span><span class="kw">let </span>expected = <span class="macro">json!</span>({
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<span class="string">"fingerprint"</span>: <span class="string">"0xF9BA143B95FF6D82"</span>,
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<span class="string">"location"</span>: <span class="string">"Menlo Park, CA"</span>,
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});
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<span class="kw">let </span>v = serde_json::to_value(u).unwrap();
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<span class="macro">assert_eq!</span>(v, expected);
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<span class="prelude-val">Ok</span>(())
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}</code></pre></div>
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<h2 id="errors"><a href="#errors">Errors</a></h2>
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<p>This conversion can fail if <code>T</code>’s implementation of <code>Serialize</code> decides to
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fail, or if <code>T</code> contains a map with non-string keys.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::collections::BTreeMap;
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<span class="kw">fn </span>main() {
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<span class="comment">// The keys in this map are vectors, not strings.
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</span><span class="kw">let </span><span class="kw-2">mut </span>map = BTreeMap::new();
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map.insert(<span class="macro">vec!</span>[<span class="number">32</span>, <span class="number">64</span>], <span class="string">"x86"</span>);
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<span class="macro">println!</span>(<span class="string">"{}"</span>, serde_json::to_value(map).unwrap_err());
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}</code></pre></div>
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</div></details></section></div></main></body></html> |