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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Debugging · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="## Enabling Keyboard Shortcuts"/><meta name="docsearch:version" content="next"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Debugging · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/"/><meta property="og:description" content="## Enabling Keyboard Shortcuts"/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/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://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Debugging · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="## Accessing the In-App Developer Menu"/><meta name="docsearch:version" content="next"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Debugging · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/"/><meta property="og:description" content="## Accessing the In-App Developer Menu"/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/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://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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@@ -68,27 +68,16 @@
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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/react-native-website/blob/master/docs/debugging.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Debugging</h1></header><article><div><span><h2><a class="anchor" aria-hidden="true" id="enabling-keyboard-shortcuts"></a><a href="#enabling-keyboard-shortcuts" 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>Enabling Keyboard Shortcuts</h2>
<p>React Native supports a few keyboard shortcuts in the iOS Simulator. They are described below. To enable them, open the Hardware menu, select Keyboard, and make sure that &quot;Connect Hardware Keyboard&quot; is checked.</p>
<h2><a class="anchor" aria-hidden="true" id="accessing-the-in-app-developer-menu"></a><a href="#accessing-the-in-app-developer-menu" 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>Accessing the In-App Developer Menu</h2>
</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/react-native-website/blob/master/docs/debugging.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Debugging</h1></header><article><div><span><h2><a class="anchor" aria-hidden="true" id="accessing-the-in-app-developer-menu"></a><a href="#accessing-the-in-app-developer-menu" 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>Accessing the In-App Developer Menu</h2>
<p>You can access the developer menu by shaking your device or by selecting &quot;Shake Gesture&quot; inside the Hardware menu in the iOS Simulator. You can also use the <code>⌘D</code> keyboard shortcut when your app is running in the iOS Simulator, or <code>⌘M</code> when running in an Android emulator on Mac OS and <code>Ctrl+M</code> on Windows and Linux. Alternatively for Android, you can run the command <code>adb shell input keyevent 82</code> to open the dev menu (82 being the Menu key code).</p>
<p><img src="/react-native/docs/assets/DeveloperMenu.png" alt=""></p>
<blockquote>
<p>The Developer Menu is disabled in release (production) builds.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="reloading-javascript"></a><a href="#reloading-javascript" 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>Reloading JavaScript</h2>
<p>Instead of recompiling your app every time you make a change, you can reload your app's JavaScript code instantly. To do so, select &quot;Reload&quot; from the Developer Menu. You can also press <code>⌘R</code> in the iOS Simulator, or tap <code>R</code> twice on Android emulators.</p>
<h3><a class="anchor" aria-hidden="true" id="automatic-reloading"></a><a href="#automatic-reloading" 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>Automatic reloading</h3>
<p>You can speed up your development times by having your app reload automatically any time your code changes. Automatic reloading can be enabled by selecting &quot;Enable Live Reload&quot; from the Developer Menu.</p>
<p>You may even go a step further and keep your app running as new versions of your files are injected into the JavaScript bundle automatically by enabling <a href="https://facebook.github.io/react-native/blog/2016/03/24/introducing-hot-reloading">Hot Reloading</a> from the Developer Menu. This will allow you to persist the app's state through reloads.</p>
<blockquote>
<p>There are some instances where hot reloading cannot be implemented perfectly. If you run into any issues, use a full reload to reset your app.</p>
</blockquote>
<p>You will need to rebuild your app for changes to take effect in certain situations:</p>
<ul>
<li>You have added new resources to your native app's bundle, such as an image in <code>Images.xcassets</code> on iOS or the <code>res/drawable</code> folder on Android.</li>
<li>You have modified native code (Objective-C/Swift on iOS or Java/C++ on Android).</li>
</ul>
<h2><a class="anchor" aria-hidden="true" id="enabling-fast-refresh"></a><a href="#enabling-fast-refresh" 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>Enabling Fast Refresh</h2>
<p>Fast Refresh is a React Native feature that allows you to get near-instant feedback for changes in your React components. While debugging, it can help to have <a href="/react-native/docs/next/fast-refresh">Fast Refresh</a> enabled. Fast Refresh is enabled by default, and you can toggle &quot;Enable Fast Refresh&quot; in the React Native developer menu. When enabled, most of your edits should be visible within a second or two.</p>
<h2><a class="anchor" aria-hidden="true" id="enabling-keyboard-shortcuts"></a><a href="#enabling-keyboard-shortcuts" 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>Enabling Keyboard Shortcuts</h2>
<p>React Native supports a few keyboard shortcuts in the iOS Simulator. They are described below. To enable them, open the Hardware menu, select Keyboard, and make sure that &quot;Connect Hardware Keyboard&quot; is checked.</p>
<h2><a class="anchor" aria-hidden="true" id="in-app-errors-and-warnings"></a><a href="#in-app-errors-and-warnings" 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>In-app Errors and Warnings</h2>
<p>Errors and warnings are displayed inside your app in development builds.</p>
<h3><a class="anchor" aria-hidden="true" id="errors"></a><a href="#errors" 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>Errors</h3>
@@ -188,7 +177,7 @@ YellowBox<span class="token punctuation">.</span><span class="token function">ig
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="debugging-native-code"></a><a href="#debugging-native-code" 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>Debugging native code</h2>
<p>When working with native code, such as when writing native modules, you can launch the app from Android Studio or Xcode and take advantage of the native debugging features (setting up breakpoints, etc.) as you would in case of building a standard native app.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/timers"><span class="arrow-prev">← </span><span>Timers</span></a><a class="docs-next button" href="/react-native/docs/next/performance"><span>Performance</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#enabling-keyboard-shortcuts">Enabling Keyboard Shortcuts</a></li><li><a href="#accessing-the-in-app-developer-menu">Accessing the In-App Developer Menu</a></li><li><a href="#reloading-javascript">Reloading JavaScript</a><ul class="toc-headings"><li><a href="#automatic-reloading">Automatic reloading</a></li></ul></li><li><a href="#in-app-errors-and-warnings">In-app Errors and Warnings</a><ul class="toc-headings"><li><a href="#errors">Errors</a></li><li><a href="#warnings">Warnings</a></li></ul></li><li><a href="#chrome-developer-tools">Chrome Developer Tools</a><ul class="toc-headings"><li><a href="#debugging-using-a-custom-javascript-debugger">Debugging using a custom JavaScript debugger</a></li></ul></li><li><a href="#safari-developer-tools">Safari Developer Tools</a></li><li><a href="#react-developer-tools">React Developer Tools</a><ul class="toc-headings"><li><a href="#integration-with-react-native-inspector">Integration with React Native Inspector</a></li><li><a href="#inspecting-component-instances">Inspecting Component Instances</a></li></ul></li><li><a href="#performance-monitor">Performance Monitor</a></li><li><a href="#accessing-console-logs">Accessing console logs</a></li><li><a href="#debugging-on-a-device-with-chrome-developer-tools">Debugging on a device with Chrome Developer Tools</a></li><li><a href="#debugging-native-code">Debugging native code</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://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="/react-native/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="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/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>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'));
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/timers"><span class="arrow-prev">← </span><span>Timers</span></a><a class="docs-next button" href="/react-native/docs/next/performance"><span>Performance</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#accessing-the-in-app-developer-menu">Accessing the In-App Developer Menu</a></li><li><a href="#enabling-fast-refresh">Enabling Fast Refresh</a></li><li><a href="#enabling-keyboard-shortcuts">Enabling Keyboard Shortcuts</a></li><li><a href="#in-app-errors-and-warnings">In-app Errors and Warnings</a><ul class="toc-headings"><li><a href="#errors">Errors</a></li><li><a href="#warnings">Warnings</a></li></ul></li><li><a href="#chrome-developer-tools">Chrome Developer Tools</a><ul class="toc-headings"><li><a href="#debugging-using-a-custom-javascript-debugger">Debugging using a custom JavaScript debugger</a></li></ul></li><li><a href="#safari-developer-tools">Safari Developer Tools</a></li><li><a href="#react-developer-tools">React Developer Tools</a><ul class="toc-headings"><li><a href="#integration-with-react-native-inspector">Integration with React Native Inspector</a></li><li><a href="#inspecting-component-instances">Inspecting Component Instances</a></li></ul></li><li><a href="#performance-monitor">Performance Monitor</a></li><li><a href="#accessing-console-logs">Accessing console logs</a></li><li><a href="#debugging-on-a-device-with-chrome-developer-tools">Debugging on a device with Chrome Developer Tools</a></li><li><a href="#debugging-native-code">Debugging native code</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://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="/react-native/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="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/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>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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