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<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>React Native | Build Native Apps Using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="React Native | Build 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"><meta property="og:description" content="Build Native Apps Using React"><link rel="shortcut icon" href="/react-native/img/favicon.png"><link rel="stylesheet" href="/react-native/css/react-native.css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href="/react-native/"><img src="/react-native/img/logo.png">React Native</a><ul class="nav-site"><li><a href="/react-native/docs/getting-started.html#content" class="active">docs</a></li><li><a href="/react-native/support.html" class="">support</a></li><li><a href="http://github.com/facebook/react-native" class="">github</a></li></ul></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div class="nav-docs-section"><h3>Quick Start</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/getting-started.html#content">Getting Started</a></li></ul></div><div class="nav-docs-section"><h3>Community Resources</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/videos.html#content">Videos</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/pixels.html#content">Physical vs Logical Pixels</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/style.html#content">Style</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/nativemodulesios.html#content">Native Modules (iOS)</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/activityindicatorios.html#content">ActivityIndicatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/datepickerios.html#content">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/image.html#content">Image</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/listview.html#content">ListView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/mapview.html#content">MapView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigatorios.html#content">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pickerios.html#content">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/scrollview.html#content">ScrollView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/sliderios.html#content">SliderIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/switchios.html#content">SwitchIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tabbarios.html#content">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/text.html#content">Text</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/textinput.html#content">TextInput</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablehighlight.html#content">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchableopacity.html#content">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablewithoutfeedback.html#content">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/view.html#content">View</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/webview.html#content">WebView</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/alertios.html#content">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/animation.html#content">Animation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appregistry.html#content">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appstate.html#content">AppState</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appstateios.html#content">AppStateIOS</a></li><li><a style="margin-left:0;" class="active" href="/react-native/docs/asyncstorage.html#content">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/cameraroll.html#content">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/interactionmanager.html#content">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/layoutanimation.html#content">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/netinfo.html#content">NetInfo</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pixelratio.html#content">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/statusbarios.html#content">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/stylesheet.html#content">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/vibrationios.html#content">VibrationIOS</a></li></ul></div><div class="nav-docs-section"><h3>styles</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/layoutproptypes.html#content">LayoutPropTypes</a></li></ul></div><div class="nav-docs-section"><h3>Polyfills</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/network.html#content">Network</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/timers.html#content">Timers</a></li></ul></div></div><div class="inner-content"><a id="content"></a><h1>AsyncStorage</h1><div><div><p>AsyncStorage is a simple, asynchronous, persistent, global, key-value storage
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system. It should be used instead of LocalStorage.</p><p>It is recommended that you use an abstraction on top of AsyncStorage instead
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of AsyncStorage directly for anything more than light usage since it
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operates globally.</p><p>This JS code is a simple facad over the native iOS implementation to provide
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a clear JS API, real Error objects, and simple non-multi functions.</p></div><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="#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: string, callback: (error: ?Error, result: ?string) => void)</span> <a class="hash-link" href="#getitem">#</a></h4><div><p>Fetches <code>key</code> and passes the result to <code>callback</code>, along with an <code>Error</code> if
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there is any.</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: string, value: string, callback: ?(error: ?Error) => void)</span> <a class="hash-link" href="#setitem">#</a></h4><div><p>Sets <code>value</code> for <code>key</code> and calls <code>callback</code> on completion, along with an
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<code>Error</code> if there is any.</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: string, callback: ?(error: ?Error) => void)</span> <a class="hash-link" href="#removeitem">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="mergeitem"></a><span class="propType">static </span>mergeItem<span class="propType">(key: string, value: string, callback: ?(error: ?Error) => void)</span> <a class="hash-link" href="#mergeitem">#</a></h4><div><p>Merges existing value with input value, assuming they are stringified json.</p><p>Not supported by all native implementations.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="clear"></a><span class="propType">static </span>clear<span class="propType">(callback: ?(error: ?Error) => void)</span> <a class="hash-link" href="#clear">#</a></h4><div><p>Erases <em>all</em> AsyncStorage for all clients, libraries, etc. You probably
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don't want to call this - use removeItem or multiRemove to clear only your
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own keys instead.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="getallkeys"></a><span class="propType">static </span>getAllKeys<span class="propType">(callback: (error: ?Error) => void)</span> <a class="hash-link" href="#getallkeys">#</a></h4><div><p>Gets <em>all</em> keys known to the system, for all callers, libraries, etc.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiget"></a><span class="propType">static </span>multiGet<span class="propType">(keys: Array<string>, callback: (errors: ?Array<Error>, result: ?Array<Array<string>>) => void)</span> <a class="hash-link" href="#multiget">#</a></h4><div><p>multiGet invokes callback with an array of key-value pair arrays that
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matches the input format of multiSet.</p><p> multiGet(['k1', 'k2'], cb) -> cb([['k1', 'val1'], ['k2', 'val2']])</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiset"></a><span class="propType">static </span>multiSet<span class="propType">(keyValuePairs: Array<Array<string>>, callback: ?(errors: ?Array<Error>) => void)</span> <a class="hash-link" href="#multiset">#</a></h4><div><p>multiSet and multiMerge take arrays of key-value array pairs that match
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the output of multiGet, e.g.</p><p> multiSet([['k1', 'val1'], ['k2', 'val2']], cb);</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiremove"></a><span class="propType">static </span>multiRemove<span class="propType">(keys: Array<string>, callback: ?(errors: ?Array<Error>) => void)</span> <a class="hash-link" href="#multiremove">#</a></h4><div><p>Delete all the keys in the <code>keys</code> array.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multimerge"></a><span class="propType">static </span>multiMerge<span class="propType">(keyValuePairs: Array<Array<string>>, callback: ?(errors: ?Array<Error>) => void)</span> <a class="hash-link" href="#multimerge">#</a></h4><div><p>Merges existing values with input values, assuming they are stringified
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json.</p><p>Not supported by all native implementations.</p></div></div></div></div><noscript></noscript><div class="docs-prevnext"><a class="docs-next" href="cameraroll.html#content">Next →</a></div></div></section><footer class="wrap"><div class="right">© 2015 Facebook Inc.</div></footer></div><div id="fb-root"></div><script>
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