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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Making a Progressive Web App · Create React App</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="<p>The production build has all the tools necessary to generate a first-class</p>
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</script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/logo.svg" alt="Create React App"/><h2 class="headerTitleWithLogo">Create React App</h2></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/getting-started" target="_self">Docs</a></li><li class=""><a href="https://reactjs.org/community/support.html" target="_self">Help</a></li><li class=""><a href="https://www.github.com/facebook/create-react-app" target="_self">GitHub</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container docsNavContainer" id="docsNav"><nav class="toc"><div class="toggleNav"><section class="navWrapper wrapper"><div class="navBreadcrumb wrapper"><div class="navToggle" id="navToggler"><i></i></div><h2><i>›</i><span>Building your App</span></h2><div class="tocToggler" id="tocToggler"><i class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Welcome<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/documentation-intro">About Docs</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting Started<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 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href="/docs/setting-up-your-editor">Editor Setup</a></li><li class="navListItem"><a class="navItem" href="/docs/developing-components-in-isolation">Developing Components in Isolation</a></li><li class="navListItem"><a class="navItem" href="/docs/analyzing-the-bundle-size">Analyzing Bundle Size</a></li><li class="navListItem"><a class="navItem" href="/docs/using-https-in-development">HTTPS in Development</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Styles and Assets<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/adding-a-stylesheet">Adding Stylesheets</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-a-css-modules-stylesheet">Adding CSS Modules</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-a-sass-stylesheet">Adding Sass Stylesheets</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-css-reset">Adding CSS Reset</a></li><li class="navListItem"><a class="navItem" href="/docs/post-processing-css">Post-Processing CSS</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-images-fonts-and-files">Adding Images, Fonts, and Files</a></li><li class="navListItem"><a class="navItem" href="/docs/loading-graphql-files">Loading .graphql Files</a></li><li class="navListItem"><a class="navItem" href="/docs/using-the-public-folder">Using the Public Folder</a></li><li class="navListItem"><a class="navItem" href="/docs/code-splitting">Code Splitting</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Building your App<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/installing-a-dependency">Installing a Dependency</a></li><li class="navListItem"><a class="navItem" href="/docs/importing-a-component">Importing a Component</a></li><li class="navListItem"><a class="navItem" href="/docs/using-global-variables">Using Global Variables</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-bootstrap">Adding Bootstrap</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-flow">Adding Flow</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-typescript">Adding TypeScript</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-relay">Adding Relay</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-a-router">Adding a Router</a></li><li class="navListItem"><a class="navItem" href="/docs/adding-custom-environment-variables">Environment Variables</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/making-a-progressive-web-app">Making a Progressive Web App</a></li><li class="navListItem"><a class="navItem" href="/docs/production-build">Creating a Production Build</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Testing<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/running-tests">Running Tests</a></li><li class="navListItem"><a class="navItem" href="/docs/debugging-tests">Debugging Tests</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Back-End Integration<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/proxying-api-requests-in-development">Proxying in Development</a></li><li class="navListItem"><a class="navItem" href="/docs/fetching-data-with-ajax-requests">Fetching Data</a></li><li class="navListItem"><a class="navItem" href="/docs/integrating-with-an-api-backend">Integrating with an API</a></li><li class="navListItem"><a class="navItem" href="/docs/title-and-meta-tags">Title & Meta Tags</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Deployment<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/deployment">Deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Advanced 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/making-a-progressive-web-app.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Making a Progressive Web App</h1></header><article><div><span><p>The production build has all the tools necessary to generate a first-class
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<a href="https://developers.google.com/web/progressive-web-apps/">Progressive Web App</a>,
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but <strong>the offline/cache-first behavior is opt-in only</strong>. By default,
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the build process will generate a service worker file, but it will not be
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registered, so it will not take control of your production web app.</p>
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<p>In order to opt-in to the offline-first behavior, developers should look for the
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following in their <a href="https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/src/index.js"><code>src/index.js</code></a> file:</p>
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<pre><code class="hljs css language-js"><span class="hljs-comment">// If you want your app to work offline and load faster, you can change</span>
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<span class="hljs-comment">// unregister() to register() below. Note this comes with some pitfalls.</span>
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<span class="hljs-comment">// Learn more about service workers: https://bit.ly/CRA-PWA</span>
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serviceWorker.unregister();
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</code></pre>
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<p>As the comment states, switching <code>serviceWorker.unregister()</code> to
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<code>serviceWorker.register()</code> will opt you in to using the service worker.</p>
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<h2><a class="anchor" aria-hidden="true" id="why-opt-in"></a><a href="#why-opt-in" 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>Why Opt-in?</h2>
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<p>Offline-first Progressive Web Apps are faster and more reliable than traditional web pages, and provide an engaging mobile experience:</p>
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<ul>
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<li>All static site assets are cached so that your page loads fast on subsequent visits, regardless of network connectivity (such as 2G or 3G). Updates are downloaded in the background.</li>
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<li>Your app will work regardless of network state, even if offline. This means your users will be able to use your app at 10,000 feet and on the subway.</li>
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<li>On mobile devices, your app can be added directly to the user's home screen, app icon and all. This eliminates the need for the app store.</li>
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</ul>
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<p>However, they <a href="https://github.com/facebook/create-react-app/issues/2398">can make debugging deployments more challenging</a> so, starting with Create React App 2, service workers are opt-in.</p>
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<p>The <a href="https://developers.google.com/web/tools/workbox/modules/workbox-webpack-plugin"><code>workbox-webpack-plugin</code></a>
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is integrated into production configuration,
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and it will take care of generating a service worker file that will automatically
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precache all of your local assets and keep them up to date as you deploy updates.
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The service worker will use a <a href="https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#cache-falling-back-to-network">cache-first strategy</a>
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for handling all requests for local assets, including
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<a href="https://developers.google.com/web/fundamentals/primers/service-workers/high-performance-loading#first_what_are_navigation_requests">navigation requests</a>
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for your HTML, ensuring that your web app is consistently fast, even on a slow
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or unreliable network.</p>
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<h2><a class="anchor" aria-hidden="true" id="offline-first-considerations"></a><a href="#offline-first-considerations" 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>Offline-First Considerations</h2>
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<p>If you do decide to opt-in to service worker registration, please take the
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following into account:</p>
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<ol>
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<li><p>After the initial caching is done, the <a href="https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle">service worker lifecycle</a>
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controls when updated content ends up being shown to users. In order to guard against
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<a href="https://github.com/facebook/create-react-app/issues/3613#issuecomment-353467430">race conditions with lazy-loaded content</a>,
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the default behavior is to conservatively keep the updated service worker in the "<a href="https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle#waiting">waiting</a>"
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state. This means that users will end up seeing older content until they close (reloading is not
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enough) their existing, open tabs. See <a href="https://jeffy.info/2018/10/10/sw-in-c-r-a.html">this blog post</a>
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for more details about this behavior.</p></li>
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<li><p>Users aren't always familiar with offline-first web apps. It can be useful to
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<a href="https://developers.google.com/web/fundamentals/instant-and-offline/offline-ux#inform_the_user_when_the_app_is_ready_for_offline_consumption">let the user know</a>
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when the service worker has finished populating your caches (showing a "This web
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app works offline!" message) and also let them know when the service worker has
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fetched the latest updates that will be available the next time they load the
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page (showing a "New content is available once existing tabs are closed." message). Showing
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these messages is currently left as an exercise to the developer, but as a
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starting point, you can make use of the logic included in <a href="https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/src/serviceWorker.js"><code>src/serviceWorker.js</code></a>, which
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demonstrates which service worker lifecycle events to listen for to detect each
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scenario, and which as a default, just logs appropriate messages to the
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JavaScript console.</p></li>
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<li><p>Service workers <a href="https://developers.google.com/web/fundamentals/getting-started/primers/service-workers#you_need_https">require HTTPS</a>,
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although to facilitate local testing, that policy
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<a href="https://stackoverflow.com/questions/34160509/options-for-testing-service-workers-via-http/34161385#34161385">does not apply to <code>localhost</code></a>.
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If your production web server does not support HTTPS, then the service worker
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registration will fail, but the rest of your web app will remain functional.</p></li>
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<li><p>The service worker is only enabled in the <a href="/docs/deployment">production environment</a>,
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e.g. the output of <code>npm run build</code>. It's recommended that you do not enable an
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offline-first service worker in a development environment, as it can lead to
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frustration when previously cached assets are used and do not include the latest
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changes you've made locally.</p></li>
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<li><p>If you <em>need</em> to test your offline-first service worker locally, build
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the application (using <code>npm run build</code>) and run a simple http server from your
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||
build directory. After running the build script, <code>create-react-app</code> will give
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instructions for one way to test your production build locally and the <a href="/docs/deployment">deployment instructions</a> have
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instructions for using other methods. <em>Be sure to always use an
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incognito window to avoid complications with your browser cache.</em></p></li>
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<li><p>By default, the generated service worker file will not intercept or cache any
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cross-origin traffic, like HTTP <a href="/docs/integrating-with-an-api-backend">API requests</a>,
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images, or embeds loaded from a different domain.</p></li>
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</ol>
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<h2><a class="anchor" aria-hidden="true" id="progressive-web-app-metadata"></a><a href="#progressive-web-app-metadata" 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>Progressive Web App Metadata</h2>
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<p>The default configuration includes a web app manifest located at
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<a href="https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/public/manifest.json"><code>public/manifest.json</code></a>, that you can customize with
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details specific to your web application.</p>
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<p>When a user adds a web app to their homescreen using Chrome or Firefox on
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Android, the metadata in <a href="https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/public/manifest.json"><code>manifest.json</code></a> determines what
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icons, names, and branding colors to use when the web app is displayed.
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<a href="https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/">The Web App Manifest guide</a>
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provides more context about what each field means, and how your customizations
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will affect your users' experience.</p>
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<p>Progressive web apps that have been added to the homescreen will load faster and
|
||
work offline when there's an active service worker. That being said, the
|
||
metadata from the web app manifest will still be used regardless of whether or
|
||
not you opt-in to service worker registration.</p>
|
||
</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/adding-custom-environment-variables"><span class="arrow-prev">← </span><span>Environment Variables</span></a><a class="docs-next button" href="/docs/production-build"><span>Creating a Production Build</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#why-opt-in">Why Opt-in?</a></li><li><a href="#offline-first-considerations">Offline-First Considerations</a></li><li><a href="#progressive-web-app-metadata">Progressive Web App Metadata</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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