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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."><title>from_slice in serde_json - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.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" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.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="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../serde_json/index.html">serde_<wbr>json</a><span class="version">1.0.133</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">from_<wbr>slice</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#example" title="Example">Example</a></li><li><a href="#errors" title="Errors">Errors</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate serde_<wbr>json</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">serde_json</a></span><h1>Function <span class="fn">from_slice</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/de.rs.html#2650-2655">Source</a> </span></div><pre class="rust item-decl"><code>pub fn from_slice&lt;'a, T&gt;(v: &amp;'a [<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.u8.html">u8</a>]) -&gt; <a class="type" href="type.Result.html" title="type serde_json::Result">Result</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="../serde/de/trait.Deserialize.html" title="trait serde::de::Deserialize">Deserialize</a>&lt;'a&gt;,</div></code></pre><details class="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 class="doc-anchor" href="#example">§</a>Example</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>serde::Deserialize;
<span class="attr">#[derive(Deserialize, Debug)]
</span><span class="kw">struct </span>User {
fingerprint: String,
location: String,
}
<span class="kw">fn </span>main() {
<span class="comment">// The type of `j` is `&amp;[u8]`
</span><span class="kw">let </span>j = <span class="string">b"
{
\"fingerprint\": \"0xF9BA143B95FF6D82\",
\"location\": \"Menlo Park, CA\"
}"</span>;
<span class="kw">let </span>u: User = serde_json::from_slice(j).unwrap();
<span class="macro">println!</span>(<span class="string">"{:#?}"</span>, u);
}</code></pre></div>
<h2 id="errors"><a class="doc-anchor" href="#errors">§</a>Errors</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></body></html>