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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/hermes.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Enabling Hermes</h1></header><article><div><span><p><a href="https://hermesvm.io">
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<img width="300" height="300" style="float: right; margin: -30px 4px 0;" src="/react-native/docs/assets/HermesLogo.svg"/>
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</a></p>
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<p><a href="https://hermesvm.io">Hermes</a> is an open-source JavaScript engine optimized for running React Native apps on Android. For many apps, simply enabling Hermes will result in improved start-up time, decreased memory usage and smaller app size. At this time Hermes is an <strong>opt-in</strong> React Native feature, and this guide explains how to enable it.</p>
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<p>First, ensure you're using at least version 0.60.1 of React Native. If you're upgrading an existing app ensure everything works before trying to switch to Hermes.</p>
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<p>Edit your <code>android/app/build.gradle</code> file and make the change illustrated below:</p>
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<pre><code class="hljs css language-diff"> project.ext.react = [
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entryFile: "index.js",
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<span class="hljs-deletion">- enableHermes: false // clean and rebuild if changing</span>
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<span class="hljs-addition">+ enableHermes: true // clean and rebuild if changing</span>
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]
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</code></pre>
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<p>Next, if you've already built your app at least once, clean the build:</p>
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<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> <span class="hljs-built_in">cd</span> android && ./gradlew clean</span>
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</code></pre>
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<p>That's it! You should now be able to develop and deploy your app as normal:</p>
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<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> react-native run-android</span>
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</code></pre>
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<h2><a class="anchor" aria-hidden="true" id="confirming-hermes-is-in-use"></a><a href="#confirming-hermes-is-in-use" 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>Confirming Hermes is in use</h2>
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<p>If you've just created a new app from scratch you should see if Hermes is enabled in the welcome view:</p>
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<p><img src="/react-native/docs/assets/HermesApp.jpg" alt="Where to find JS engine status in AwesomeProject"></p>
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<p>A <code>HermesInternal</code> global variable will be available in JavaScript that can be used to verify that Hermes is in use:</p>
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<pre><code class="hljs css language-javascript"><span class="token keyword">const</span> <span class="token function-variable function">isHermes</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> global<span class="token punctuation">.</span>HermesInternal <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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</code></pre>
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<p>To see the benefits of Hermes, try making a release build/deployment of your app to compare. For example:</p>
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<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> react-native run-android --variant release</span>
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</code></pre>
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<p>This will compile JavaScript to bytecode during build time which will improve your app's startup speed on device.</p>
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