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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Using the Public Folder · Create React App</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="<blockquote>
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Usage<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/can-i-use-decorators">Can I Use Decorators?</a></li><li class="navListItem"><a class="navItem" href="/docs/pre-rendering-into-static-html-files">Pre-Rendering Static HTML</a></li><li class="navListItem"><a class="navItem" href="/docs/advanced-configuration">Advanced Configuration</a></li><li class="navListItem"><a class="navItem" href="/docs/alternatives-to-ejecting">Alternatives to Ejecting</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Support<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul 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</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/create-react-app/edit/master/docusaurus/docs/using-the-public-folder.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Using the Public Folder</h1></header><article><div><span><blockquote>
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<p>Note: this feature is available with <code>react-scripts@0.5.0</code> and higher.</p>
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</blockquote>
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<h2><a class="anchor" aria-hidden="true" id="changing-the-html"></a><a href="#changing-the-html" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Changing the HTML</h2>
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<p>The <code>public</code> folder contains the HTML file so you can tweak it, for example, to <a href="/docs/title-and-meta-tags">set the page title</a>.
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The <code><script></code> tag with the compiled code will be added to it automatically during the build process.</p>
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<h2><a class="anchor" aria-hidden="true" id="adding-assets-outside-of-the-module-system"></a><a href="#adding-assets-outside-of-the-module-system" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding Assets Outside of the Module System</h2>
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<p>You can also add other assets to the <code>public</code> folder.</p>
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<p>Note that we normally encourage you to <code>import</code> assets in JavaScript files instead.
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For example, see the sections on <a href="/docs/adding-a-stylesheet">adding a stylesheet</a> and <a href="/docs/adding-images-fonts-and-files">adding images and fonts</a>.
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This mechanism provides a number of benefits:</p>
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<ul>
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<li>Scripts and stylesheets get minified and bundled together to avoid extra network requests.</li>
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<li>Missing files cause compilation errors instead of 404 errors for your users.</li>
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<li>Result filenames include content hashes so you don’t need to worry about browsers caching their old versions.</li>
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</ul>
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<p>However there is an <strong>escape hatch</strong> that you can use to add an asset outside of the module system.</p>
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<p>If you put a file into the <code>public</code> folder, it will <strong>not</strong> be processed by Webpack. Instead it will be copied into the build folder untouched. To reference assets in the <code>public</code> folder, you need to use a special variable called <code>PUBLIC_URL</code>.</p>
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<p>Inside <code>index.html</code>, you can use it like this:</p>
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<pre><code class="hljs css language-html"><span class="hljs-tag"><<span class="hljs-name">link</span> <span class="hljs-attr">rel</span>=<span class="hljs-string">"shortcut icon"</span> <span class="hljs-attr">href</span>=<span class="hljs-string">"%PUBLIC_URL%/favicon.ico"</span>></span>
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</code></pre>
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<p>Only files inside the <code>public</code> folder will be accessible by <code>%PUBLIC_URL%</code> prefix. If you need to use a file from <code>src</code> or <code>node_modules</code>, you’ll have to copy it there to explicitly specify your intention to make this file a part of the build.</p>
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<p>When you run <code>npm run build</code>, Create React App will substitute <code>%PUBLIC_URL%</code> with a correct absolute path so your project works even if you use client-side routing or host it at a non-root URL.</p>
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<p>In JavaScript code, you can use <code>process.env.PUBLIC_URL</code> for similar purposes:</p>
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<pre><code class="hljs css language-js">render() {
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<span class="hljs-comment">// Note: this is an escape hatch and should be used sparingly!</span>
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<span class="hljs-comment">// Normally we recommend using `import` for getting asset URLs</span>
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<span class="hljs-comment">// as described in “Adding Images and Fonts” above this section.</span>
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<span class="hljs-keyword">return</span> <span class="xml"><span class="hljs-tag"><<span class="hljs-name">img</span> <span class="hljs-attr">src</span>=<span class="hljs-string">{process.env.PUBLIC_URL</span> + '/<span class="hljs-attr">img</span>/<span class="hljs-attr">logo.png</span>'} /></span>;
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}
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</span></code></pre>
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<p>Keep in mind the downsides of this approach:</p>
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<ul>
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<li>None of the files in <code>public</code> folder get post-processed or minified.</li>
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<li>Missing files will not be called at compilation time, and will cause 404 errors for your users.</li>
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<li>Result filenames won’t include content hashes so you’ll need to add query arguments or rename them every time they change.</li>
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</ul>
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<h2><a class="anchor" aria-hidden="true" id="when-to-use-the-public-folder"></a><a href="#when-to-use-the-public-folder" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When to Use the <code>public</code> Folder</h2>
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<p>Normally we recommend importing <a href="/docs/adding-a-stylesheet">stylesheets</a>, <a href="/docs/adding-images-fonts-and-files">images, and fonts</a> from JavaScript.
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The <code>public</code> folder is useful as a workaround for a number of less common cases:</p>
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<ul>
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<li>You need a file with a specific name in the build output, such as <a href="https://developer.mozilla.org/en-US/docs/Web/Manifest"><code>manifest.webmanifest</code></a>.</li>
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<li>You have thousands of images and need to dynamically reference their paths.</li>
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<li>You want to include a small script like <a href="https://github.hubspot.com/pace/docs/welcome/"><code>pace.js</code></a> outside of the bundled code.</li>
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<li>Some library may be incompatible with Webpack and you have no other option but to include it as a <code><script></code> tag.</li>
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</ul>
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<p>Note that if you add a <code><script></code> that declares global variables, you also need to read the next section on using them.</p>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/10/2019 by Ian Schmitz</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/loading-graphql-files"><span class="arrow-prev">← </span><span>Loading .graphql Files</span></a><a class="docs-next button" href="/docs/code-splitting"><span>Code Splitting</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#changing-the-html">Changing the HTML</a></li><li><a href="#adding-assets-outside-of-the-module-system">Adding Assets Outside of the Module System</a></li><li><a href="#when-to-use-the-public-folder">When to Use the <code>public</code> Folder</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/logo.svg" alt="Create React App" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/getting-started">Get Started</a><a href="https://reactjs.org/" target="_blank" rel="noreferrer noopener">Learn React</a></div><div><h5>Community</h5><a href="https://stackoverflow.com/questions/tagged/create-react-app" target="_blank" rel="noreferrer noopener">Stack Overflow</a><a href="https://spectrum.chat/create-react-app" target="_blank" rel="noreferrer noopener">Spectrum</a><a href="https://twitter.com/reactjs" target="_blank" rel="noreferrer noopener">Twitter</a></div><div><h5>More</h5><a href="https://www.github.com/facebook/create-react-app">GitHub</a><a class="github-button" href="https://github.com/facebook/create-react-app" data-icon="octicon-star" data-count-href="/facebook/create-react-app/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" rel="noreferrer noopener" class="fbOpenSource"><img src="/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2019 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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apiKey: '3be60f4f8ffc24c75da84857d6323791',
|
||
indexName: 'create-react-app',
|
||
inputSelector: '#search_input_react'
|
||
});
|
||
</script></body></html> |