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<!DOCTYPE html><html><head><title>AsyncStorage</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="AsyncStorage"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><base href="/react-native/"><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" 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style="margin-left:10px;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:10px;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:10px;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:10px;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:10px;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:10px;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:10px;" class="" href="docs/shadow-props.html">Shadow Props</a></li><li><a style="margin-left:10px;" class="" href="docs/viewproptypes.html">ViewPropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/viewstyleproptypes.html">ViewStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/textstyleproptypes.html">TextStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestyleproptypes.html">ImageStylePropTypes</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="asyncstorage"></a>AsyncStorage <a class="hash-link" href="docs/asyncstorage.html#asyncstorage">#</a></h1><div><div><p><code>AsyncStorage</code> is a simple, unencrypted, asynchronous, persistent, key-value storage
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 <code>AsyncStorage</code>
instead of <code>AsyncStorage</code> directly for anything more than light usage since
it operates globally.</p><p>On iOS, <code>AsyncStorage</code> is backed by native code that stores small values in a
serialized dictionary and larger values in separate files. On Android,
<code>AsyncStorage</code> will use either <a href="http://rocksdb.org/" target="_blank">RocksDB</a> or SQLite
based on what is available.</p><p>The <code>AsyncStorage</code> JavaScript code is a simple facade that provides a clear
JavaScript API, real <code>Error</code> objects, and simple non-multi functions. Each
method in the API returns a <code>Promise</code> object.</p><p>Persisting data:</p><div class="prism language-javascript"><span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token keyword">await</span> AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem</span><span class="token punctuation">(</span><span class="token string">&#x27;@MySuperStore:key&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;I like to save it.&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true"> // Error saving data
</span><span class="token punctuation">}</span></div><p>Fetching data:</p><div class="prism language-javascript"><span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> value <span class="token operator">=</span> <span class="token keyword">await</span> AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span><span class="token string">&#x27;@MySuperStore:key&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>value <span class="token operator">!==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token comment" spellcheck="true"> // We have data!!
</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true"> // Error retrieving data
</span><span class="token punctuation">}</span></div></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="methodTitle"><a class="anchor" name="getitem"></a><span class="methodType">static </span>getItem<span class="methodType">(key: string, callback?: ?(error: ?Error, result: ?string) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#getitem">#</a></h4><div><p>Fetches an item for a <code>key</code> and invokes a callback upon completion.
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to fetch.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error, result: ?string) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with a result if found or
any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="setitem"></a><span class="methodType">static </span>setItem<span class="methodType">(key: string, value: string, callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#setitem">#</a></h4><div><p>Sets the value for a <code>key</code> and invokes a callback upon completion.
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to set.</p></div></td></tr><tr><td>value<br><br><div><span>string</span></div></td><td class="description"><div><p>Value to set for the <code>key</code>.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="removeitem"></a><span class="methodType">static </span>removeItem<span class="methodType">(key: string, callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#removeitem">#</a></h4><div><p>Removes an item for a <code>key</code> and invokes a callback upon completion.
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to remove.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="mergeitem"></a><span class="methodType">static </span>mergeItem<span class="methodType">(key: string, value: string, callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#mergeitem">#</a></h4><div><p>Merges an existing <code>key</code> value with an input value, assuming both values
are stringified JSON. Returns a <code>Promise</code> object.</p><p><strong>NOTE:</strong> This is not supported by all native implementations.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to modify.</p></div></td></tr><tr><td>value<br><br><div><span>string</span></div></td><td class="description"><div><p>New value to merge for the <code>key</code>.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript">
<span class="token keyword">let</span> UID123_object <span class="token operator">=</span> <span class="token punctuation">{</span>
name<span class="token punctuation">:</span> <span class="token string">&#x27;Chris&#x27;</span><span class="token punctuation">,</span>
age<span class="token punctuation">:</span> <span class="token number">30</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">
// You only need to define what will be added or updated
</span><span class="token keyword">let</span> UID123_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
age<span class="token punctuation">:</span> <span class="token number">31</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">&#x27;blue&#x27;</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem</span><span class="token punctuation">(</span><span class="token string">&#x27;UID123&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>UID123_object<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">mergeItem</span><span class="token punctuation">(</span><span class="token string">&#x27;UID123&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>UID123_delta<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span><span class="token string">&#x27;UID123&#x27;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> result<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// Console log result:
</span><span class="token comment" spellcheck="true">// =&gt; {&#x27;name&#x27;:&#x27;Chris&#x27;,&#x27;age&#x27;:31,&#x27;traits&#x27;:
</span><span class="token comment" spellcheck="true">// {&#x27;shoe_size&#x27;:10,&#x27;hair&#x27;:&#x27;brown&#x27;,&#x27;eyes&#x27;:&#x27;blue&#x27;}}</span></div></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="clear"></a><span class="methodType">static </span>clear<span class="methodType">(callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#clear">#</a></h4><div><p>Erases <em>all</em> <code>AsyncStorage</code> for all clients, libraries, etc. You probably
don&#x27;t want to call this; use <code>removeItem</code> or <code>multiRemove</code> to clear only
your app&#x27;s keys. Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>[callback]<br><br><div><span>?(error: ?Error) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="getallkeys"></a><span class="methodType">static </span>getAllKeys<span class="methodType">(callback?: ?(error: ?Error, keys: ?Array&lt;string&gt;) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#getallkeys">#</a></h4><div><p>Gets <em>all</em> keys known to your app; for all callers, libraries, etc.
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>[callback]<br><br><div><span>?(error: ?Error, keys: ?Array&lt;string&gt;) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called the keys found and any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="flushgetrequests"></a><span class="methodType">static </span>flushGetRequests<span class="methodType">()</span> <a class="hash-link" href="docs/asyncstorage.html#flushgetrequests">#</a></h4><div><p>Flushes any pending requests using a single batch call to get the data.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multiget"></a><span class="methodType">static </span>multiGet<span class="methodType">(keys: Array&lt;string&gt;, callback?: ?(errors: ?Array&lt;Error&gt;, result: ?Array&lt;Array&lt;string&gt;&gt;) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#multiget">#</a></h4><div><p>This allows you to batch the fetching of items given an array of <code>key</code>
inputs. Your callback will be invoked with an array of corresponding
key-value pairs found:</p><div class="prism language-javascript"><span class="token function">multiGet</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">&#x27;k1&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;k2&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">,</span> cb<span class="token punctuation">)</span> <span class="token operator">-</span><span class="token operator">&gt;</span> <span class="token function">cb</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">&#x27;k1&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;val1&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">&#x27;k2&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;val2&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">)</span></div><p>The method returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keys<br><br><div><span>Array&lt;string&gt;</span></div></td><td class="description"><div><p>Array of key for the items to get.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array&lt;Error&gt;, result: ?Array&lt;Array&lt;string&gt;&gt;) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with a key-value array of
the results, plus an array of any key-specific errors found.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript">AsyncStorage<span class="token punctuation">.</span><span class="token function">getAllKeys</span><span class="token punctuation">(</span><span class="token punctuation">(</span>err<span class="token punctuation">,</span> keys<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiGet</span><span class="token punctuation">(</span>keys<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> stores<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
stores<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true"> // get at each store&#x27;s key/value so you can work with it
</span> <span class="token keyword">let</span> key <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> value <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multiset"></a><span class="methodType">static </span>multiSet<span class="methodType">(keyValuePairs: Array&lt;Array&lt;string&gt;&gt;, callback?: ?(errors: ?Array&lt;Error&gt;) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#multiset">#</a></h4><div><p>Use this as a batch operation for storing multiple key-value pairs. When
the operation completes you&#x27;ll get a single callback with any errors:</p><div class="prism language-javascript"><span class="token function">multiSet</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">&#x27;k1&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;val1&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">&#x27;k2&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;val2&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">,</span> cb<span class="token punctuation">)</span><span class="token punctuation">;</span></div><p>The method returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keyValuePairs<br><br><div><span>Array&lt;Array&lt;string&gt;&gt;</span></div></td><td class="description"><div><p>Array of key-value array for the items to set.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array&lt;Error&gt;) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with an array of any
key-specific errors found.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multiremove"></a><span class="methodType">static </span>multiRemove<span class="methodType">(keys: Array&lt;string&gt;, callback?: ?(errors: ?Array&lt;Error&gt;) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#multiremove">#</a></h4><div><p>Call this to batch the deletion of all keys in the <code>keys</code> array. Returns
a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keys<br><br><div><span>Array&lt;string&gt;</span></div></td><td class="description"><div><p>Array of key for the items to delete.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array&lt;Error&gt;) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called an array of any key-specific
errors found.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript">
<span class="token keyword">let</span> keys <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">&#x27;k1&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;k2&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiRemove</span><span class="token punctuation">(</span>keys<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true"> // keys k1 &amp; k2 removed, if they existed
</span> <span class="token comment" spellcheck="true"> // do most stuff after removal (if you want)
</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multimerge"></a><span class="methodType">static </span>multiMerge<span class="methodType">(keyValuePairs: Array&lt;Array&lt;string&gt;&gt;, callback?: ?(errors: ?Array&lt;Error&gt;) =&gt; void)</span> <a class="hash-link" href="docs/asyncstorage.html#multimerge">#</a></h4><div><p>Batch operation to merge in existing and new values for a given set of
keys. This assumes that the values are stringified JSON. Returns a
<code>Promise</code> object.</p><p><strong>NOTE</strong>: This is not supported by all native implementations.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keyValuePairs<br><br><div><span>Array&lt;Array&lt;string&gt;&gt;</span></div></td><td class="description"><div><p>Array of key-value array for the items to merge.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array&lt;Error&gt;) =&gt; void</span></div></td><td class="description"><div><p>Function that will be called with an array of any
key-specific errors found.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript"><span class="token comment" spellcheck="true">
// first user, initial values
</span><span class="token keyword">let</span> UID234_object <span class="token operator">=</span> <span class="token punctuation">{</span>
name<span class="token punctuation">:</span> <span class="token string">&#x27;Chris&#x27;</span><span class="token punctuation">,</span>
age<span class="token punctuation">:</span> <span class="token number">30</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// first user, delta values
</span><span class="token keyword">let</span> UID234_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
age<span class="token punctuation">:</span> <span class="token number">31</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">&#x27;blue&#x27;</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// second user, initial values
</span><span class="token keyword">let</span> UID345_object <span class="token operator">=</span> <span class="token punctuation">{</span>
name<span class="token punctuation">:</span> <span class="token string">&#x27;Marge&#x27;</span><span class="token punctuation">,</span>
age<span class="token punctuation">:</span> <span class="token number">25</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">&#x27;blonde&#x27;</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">&#x27;blue&#x27;</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// second user, delta values
</span><span class="token keyword">let</span> UID345_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
age<span class="token punctuation">:</span> <span class="token number">26</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">&#x27;green&#x27;</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">6</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> multi_set_pairs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">&#x27;UID234&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>UID234_object<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">&#x27;UID345&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>UID345_object<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
<span class="token keyword">let</span> multi_merge_pairs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">&#x27;UID234&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>UID234_delta<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">&#x27;UID345&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>UID345_delta<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiSet</span><span class="token punctuation">(</span>multi_set_pairs<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiMerge</span><span class="token punctuation">(</span>multi_merge_pairs<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiGet</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">&#x27;UID234&#x27;</span><span class="token punctuation">,</span><span class="token string">&#x27;UID345&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> stores<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
stores<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span> <span class="token punctuation">(</span>result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
<span class="token keyword">let</span> key <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> val <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> val<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// Console log results:
</span><span class="token comment" spellcheck="true">// =&gt; UID234 {&quot;name&quot;:&quot;Chris&quot;,&quot;age&quot;:31,&quot;traits&quot;:{&quot;shoe_size&quot;:10,&quot;hair&quot;:&quot;brown&quot;,&quot;eyes&quot;:&quot;blue&quot;}}
</span><span class="token comment" spellcheck="true">// =&gt; UID345 {&quot;name&quot;:&quot;Marge&quot;,&quot;age&quot;:26,&quot;traits&quot;:{&quot;shoe_size&quot;:6,&quot;hair&quot;:&quot;blonde&quot;,&quot;eyes&quot;:&quot;green&quot;}}</span></div></div></div></div></span></div><p class="edit-page-block"><a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Storage/AsyncStorage.js">Improve this page</a> by sending a pull request!</p><div class="docs-prevnext"><a class="docs-prev" href="docs/appstate.html#content">← Prev</a><a class="docs-next" href="docs/backandroid.html#content">Next →</a></div></div></section><footer class="nav-footer"><section class="sitemap"><a href="/react-native" class="nav-home"><img src="img/header_logo.png" alt="React Native" width="66" height="58"></a><div><h5><a href="docs/">Docs</a></h5><a href="docs/getting-started.html">Getting Started</a><a href="docs/tutorial.html">Learn the Basics</a><a href="docs/components-and-apis.html">Components and APIs</a><a href="docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/support.html">Community</a></h5><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Meetups</a><a href="https://www.facebook.com/groups/react.native.community" target="_blank">Facebook Group</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a></div><div><h5><a href="/react-native/support.html">Help</a></h5><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a><a href="/react-native/versions.html" target="_blank">Latest Releases</a><a href="https://react-native.canny.io/feature-requests" target="_blank">Feature Requests</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="http://facebook.github.io/react/" target="_blank">React</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><div class="githubButton"><a class="github-button" href="https://github.com/facebook/react-native" data-icon="octicon-star" data-count-href="/facebook/react-native/stargazers" data-count-api="/repos/facebook/react-native#stargazers_count" data-count-aria-label="# stargazers on GitHub" aria-label="Star facebook/react-native on GitHub">Star</a></div></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&amp;id=47cd41008f" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate><div id="mc_embed_signup_scroll"><label for="mce-EMAIL"><h5>Get the React Native Newsletter</h5></label><input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required><div style="position:absolute;left:-5000px;" aria-hidden="true"><input type="text" name="b_db0dd948e2b729ee62625b1a8_47cd41008f" tabindex="-1" value=""></div><div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded-subscribe" class="button"></div></div></form></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 © 2017 Facebook Inc.</section></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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