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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>AppRegistry · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="`AppRegistry` is the JS entry point to running all React Native apps. App root components should register themselves with `AppRegistry.registerComponent`, then the native system can load the bundle for the app and then actually run the app when it&#x27;s ready by invoking `AppRegistry.runApplication`."/><meta name="docsearch:version" content="0.40"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="AppRegistry · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://reactnative.dev/"/><meta property="og:description" content="`AppRegistry` is the JS entry point to running all React Native apps. App root components should register themselves with `AppRegistry.registerComponent`, then the native system can load the bundle for the app and then actually run the app when it&#x27;s ready by invoking `AppRegistry.runApplication`."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/img/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/appregistry.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">AppRegistry</h1></header><article><div><span><p><code>AppRegistry</code> is the JS entry point to running all React Native apps. App root components should register themselves with <code>AppRegistry.registerComponent</code>, then the native system can load the bundle for the app and then actually run the app when it's ready by invoking <code>AppRegistry.runApplication</code>.</p>
<p>To &quot;stop&quot; an application when a view should be destroyed, call <code>AppRegistry.unmountApplicationComponentAtRootTag</code> with the tag that was pass into <code>runApplication</code>. These should always be used as a pair.</p>
<p><code>AppRegistry</code> should be <code>require</code>d early in the <code>require</code> sequence to make sure the JS execution environment is setup before other modules are <code>require</code>d.</p>
<h3><a class="anchor" aria-hidden="true" id="methods"></a><a href="#methods" 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>Methods</h3>
<ul>
<li><a href="/docs/0.40/appregistry#registerconfig"><code>registerConfig</code></a></li>
<li><a href="/docs/0.40/appregistry#registercomponent"><code>registerComponent</code></a></li>
<li><a href="/docs/0.40/appregistry#registerrunnable"><code>registerRunnable</code></a></li>
<li><a href="/docs/0.40/appregistry#getappkeys"><code>getAppKeys</code></a></li>
<li><a href="/docs/0.40/appregistry#runapplication"><code>runApplication</code></a></li>
<li><a href="/docs/0.40/appregistry#unmountapplicationcomponentatroottag"><code>unmountApplicationComponentAtRootTag</code></a></li>
<li><a href="/docs/0.40/appregistry#registerheadlesstask"><code>registerHeadlessTask</code></a></li>
<li><a href="/docs/0.40/appregistry#startheadlesstask"><code>startHeadlessTask</code></a></li>
</ul>
<hr>
<h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" 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>Reference</h1>
<h2><a class="anchor" aria-hidden="true" id="methods-1"></a><a href="#methods-1" 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>Methods</h2>
<h3><a class="anchor" aria-hidden="true" id="registerconfig"></a><a href="#registerconfig" 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><code>registerConfig()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">registerConfig</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" id="registercomponent"></a><a href="#registercomponent" 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><code>registerComponent()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">registerComponent</span><span class="token punctuation">(</span>appKey<span class="token punctuation">,</span> getComponentFunc<span class="token punctuation">)</span>
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" id="registerrunnable"></a><a href="#registerrunnable" 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><code>registerRunnable()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">registerRunnable</span><span class="token punctuation">(</span>appKey<span class="token punctuation">,</span> func<span class="token punctuation">)</span>
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" id="getappkeys"></a><a href="#getappkeys" 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><code>getAppKeys()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">getAppKeys</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" id="runapplication"></a><a href="#runapplication" 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><code>runApplication()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">runApplication</span><span class="token punctuation">(</span>appKey<span class="token punctuation">,</span> appParameters<span class="token punctuation">)</span>
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" id="unmountapplicationcomponentatroottag"></a><a href="#unmountapplicationcomponentatroottag" 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><code>unmountApplicationComponentAtRootTag()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">unmountApplicationComponentAtRootTag</span><span class="token punctuation">(</span>rootTag<span class="token punctuation">)</span>
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" id="registerheadlesstask"></a><a href="#registerheadlesstask" 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><code>registerHeadlessTask()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">registerHeadlessTask</span><span class="token punctuation">(</span>taskKey<span class="token punctuation">,</span> task<span class="token punctuation">)</span>
</code></pre>
<p>Register a headless task. A headless task is a bit of code that runs without a UI. @param taskKey the key associated with this task @param task a promise returning function that takes some data passed from the native side as the only argument; when the promise is resolved or rejected the native side is notified of this event and it may decide to destroy the JS context.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="startheadlesstask"></a><a href="#startheadlesstask" 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><code>startHeadlessTask()</code></h3>
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">startHeadlessTask</span><span class="token punctuation">(</span>taskId<span class="token punctuation">,</span> taskKey<span class="token punctuation">,</span> data<span class="token punctuation">)</span>
</code></pre>
<p>Only called from native code. Starts a headless task.</p>
<p>@param taskId the native id for this task instance to keep track of its execution @param taskKey the key for the task to start @param data the data to pass to the task</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.40/animated"><span class="arrow-prev"></span><span>Animated</span></a><a class="docs-next button" href="/docs/0.40/appstate"><span class="function-name-prevnext">AppState</span><span class="arrow-next"></span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#methods-1">Methods</a><ul class="toc-headings"><li><a href="#registerconfig"><code>registerConfig()</code></a></li><li><a href="#registercomponent"><code>registerComponent()</code></a></li><li><a href="#registerrunnable"><code>registerRunnable()</code></a></li><li><a href="#getappkeys"><code>getAppKeys()</code></a></li><li><a href="#runapplication"><code>runApplication()</code></a></li><li><a href="#unmountapplicationcomponentatroottag"><code>unmountApplicationComponentAtRootTag()</code></a></li><li><a href="#registerheadlesstask"><code>registerHeadlessTask()</code></a></li><li><a href="#startheadlesstask"><code>startHeadlessTask()</code></a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/docs/getting-started">Getting Started</a><a href="/docs/tutorial">Tutorial</a><a href="/docs/components-and-apis">Components and APIs</a><a href="/docs/more-resources">More Resources</a></div><div><h5>Community</h5><a href="/help">The React Native Community</a><a href="/showcase">Who&#x27;s using React Native?</a><a href="https://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/blog">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="https://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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