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 <!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>AsyncStorage – React Native | A framework for building native apps using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="AsyncStorage – React Native | A framework for building native apps using React"><meta property="og:type" content="website"><meta property="og:url" content="http://facebook.github.io/react-native/index.html"><meta property="og:image" content="http://facebook.github.io/react-native/img/opengraph.png?2"><meta property="og:description" content="A framework for building native apps using React"><base href="/react-native/releases/next/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" href="css/react-native.css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script 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 system that is global to the app.  It should be used instead of LocalStorage.</p><p>It is recommended that you use an abstraction on top of AsyncStorage instead
 of AsyncStorage directly for anything more than light usage since it
-operates globally.</p><p>This JS code is a simple facade over the native iOS implementation to provide
-a clear JS API, real Error objects, and simple non-multi functions. Each
+operates globally.</p><p>On iOS, AsyncStorage is backed by native code that stores small values in a serialized
+dictionary and larger values in separate files. On Android, AsyncStorage will use either
+RocksDB or SQLite based on what is available. This JS code is a simple facade that
+provides a clear JS API, real Error objects, and simple non-multi functions. Each
 method returns a <code>Promise</code> object.</p></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/asyncstorage.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="getitem"></a><span class="propType">static </span>getItem<span class="propType">(key, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#getitem">#</a></h4><div><p>Fetches <code>key</code> and passes the result to <code>callback</code>, along with an <code>Error</code> if
 there is any. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="setitem"></a><span class="propType">static </span>setItem<span class="propType">(key, value, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#setitem">#</a></h4><div><p>Sets <code>value</code> for <code>key</code> and calls <code>callback</code> on completion, along with an
 <code>Error</code> if there is any. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="removeitem"></a><span class="propType">static </span>removeItem<span class="propType">(key, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#removeitem">#</a></h4><div><p>Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="mergeitem"></a><span class="propType">static </span>mergeItem<span class="propType">(key, value, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#mergeitem">#</a></h4><div><p>Merges existing value with input value, assuming they are stringified json.