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<html><head><meta charset="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1"/><title>AsyncStorage · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta property="og:title" content="AsyncStorage · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="`AsyncStorage` is a simple, unencrypted, asynchronous, persistent, key-value storage system that is global to the app. It should be used instead of LocalStorage."/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><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/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/blog/feed.xml" title="React Native Blog RSS Feed"/><script type="text/javascript" src="https://snack.expo.io/embed.js"></script><script type="text/javascript" src="/react-native/js/codeblocks.js"></script><link rel="stylesheet" href="/react-native/css/main.css"/></head><body class="sideNavVisible"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/react-native/"><img class="logo" src="/react-native/img/header_logo.png"/><h2 class="headerTitle">React Native</h2></a><a href="/react-native/versions.html"><h3>0.34</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li><a href="/react-native/docs/0.34/getting-started.html" target="_self">Docs</a></li><li><a href="/react-native/en/help.html" 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var toggler = document.getElementById('navToggler');
var nav = document.getElementById('docsNav');
toggler.onclick = function() {
nav.classList.toggle('docsSliderActive');
};
</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/asyncstorage.md" target="_blank">Edit</a><h1>AsyncStorage</h1></header><article><div><span><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/">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>
<pre><code class="hljs"><span class="hljs-keyword">try</span> {
<span class="hljs-function">await AsyncStorage.<span class="hljs-title">setItem</span><span class="hljs-params">(<span class="hljs-string">'@MySuperStore:key'</span>, <span class="hljs-string">'I like to save it.'</span>)</span></span>;
} <span class="hljs-keyword">catch</span> (<span class="hljs-keyword">error</span>) {
<span class="hljs-comment">// Error saving data</span>
}
</code></pre>
<p>Fetching data:</p>
<pre><code class="hljs"><span class="hljs-keyword">try</span> {
<span class="hljs-keyword">const</span> <span class="hljs-keyword">value</span> = <span class="hljs-keyword">await</span> AsyncStorage.getItem(<span class="hljs-string">'@MySuperStore:key'</span>);
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">value</span> !== <span class="hljs-literal">null</span>){
<span class="hljs-comment">// We have data!!</span>
console.log(<span class="hljs-keyword">value</span>);
}
} <span class="hljs-keyword">catch</span> (error) {
<span class="hljs-comment">// Error retrieving data</span>
}
</code></pre>
<h3><a class="anchor" aria-hidden="true" name="methods"></a><a href="#methods" aria-hidden="true" class="hash-link" ><svg 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>Methods</h3>
<ul>
<li><a href="/react-native/docs/0.34/asyncstorage.html#getitem"><code>getItem</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#setitem"><code>setItem</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#removeitem"><code>removeItem</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#mergeitem"><code>mergeItem</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#clear"><code>clear</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#getallkeys"><code>getAllKeys</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#flushgetrequests"><code>flushGetRequests</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#multiget"><code>multiGet</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#multiset"><code>multiSet</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#multiremove"><code>multiRemove</code></a></li>
<li><a href="/react-native/docs/0.34/asyncstorage.html#multimerge"><code>multiMerge</code></a></li>
</ul>
<hr>
<h1><a class="anchor" aria-hidden="true" name="reference"></a><a href="#reference" aria-hidden="true" class="hash-link" ><svg 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>Reference</h1>
<h2><a class="anchor" aria-hidden="true" name="methods"></a><a href="#methods" aria-hidden="true" class="hash-link" ><svg 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>Methods</h2>
<h3><a class="anchor" aria-hidden="true" name="getitem"></a><a href="#getitem" aria-hidden="true" class="hash-link" ><svg 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><code>getItem()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> getItem(key: string, [callback]: ?<span class="hljs-function">(<span class="hljs-params">error: ?<span class="hljs-built_in">Error</span>, result: ?string</span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<p>Fetches an item for a <code>key</code> and invokes a callback upon completion. Returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>key</td><td>string</td><td>Yes</td><td>Key of the item to fetch.</td></tr>
<tr><td>callback</td><td>?(error: ?Error, result: ?string) =&gt; void</td><td>No</td><td>Function that will be called with a result if found or any error.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" name="setitem"></a><a href="#setitem" aria-hidden="true" class="hash-link" ><svg 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><code>setItem()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> setItem(key: string, <span class="hljs-attr">value</span>: string, [callback]: ?<span class="hljs-function">(<span class="hljs-params">error: ?<span class="hljs-built_in">Error</span></span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<p>Sets the value for a <code>key</code> and invokes a callback upon completion. Returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>key</td><td>string</td><td>Yes</td><td>Key of the item to set.</td></tr>
<tr><td>value</td><td>string</td><td>Yes</td><td>Value to set for the <code>key</code>.</td></tr>
<tr><td>callback</td><td>?(error: ?Error) =&gt; void</td><td>No</td><td>Function that will be called with any error.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" name="removeitem"></a><a href="#removeitem" aria-hidden="true" class="hash-link" ><svg 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><code>removeItem()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> removeItem(key: string, [callback]: ?<span class="hljs-function">(<span class="hljs-params">error: ?<span class="hljs-built_in">Error</span></span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<p>Removes an item for a <code>key</code> and invokes a callback upon completion. Returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>key</td><td>string</td><td>Yes</td><td>Key of the item to remove.</td></tr>
<tr><td>callback</td><td>?(error: ?Error) =&gt; void</td><td>No</td><td>Function that will be called with any error.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" name="mergeitem"></a><a href="#mergeitem" aria-hidden="true" class="hash-link" ><svg 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><code>mergeItem()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> mergeItem(key: string, <span class="hljs-attr">value</span>: string, [callback]: ?<span class="hljs-function">(<span class="hljs-params">error: ?<span class="hljs-built_in">Error</span></span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<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>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>key</td><td>string</td><td>Yes</td><td>Key of the item to modify.</td></tr>
<tr><td>value</td><td>string</td><td>Yes</td><td>New value to merge for the <code>key</code>.</td></tr>
<tr><td>callback</td><td>?(error: ?Error) =&gt; void</td><td>No</td><td>Function that will be called with any error.</td></tr>
</tbody>
</table>
<p>Example:</p>
<pre><code class="hljs css javascript"><span class="hljs-keyword">let</span> UID123_object = {
<span class="hljs-attr">name</span>: <span class="hljs-string">'Chris'</span>,
<span class="hljs-attr">age</span>: <span class="hljs-number">30</span>,
<span class="hljs-attr">traits</span>: {<span class="hljs-attr">hair</span>: <span class="hljs-string">'brown'</span>, <span class="hljs-attr">eyes</span>: <span class="hljs-string">'brown'</span>},
};
<span class="hljs-comment">// You only need to define what will be added or updated</span>
<span class="hljs-keyword">let</span> UID123_delta = {
<span class="hljs-attr">age</span>: <span class="hljs-number">31</span>,
<span class="hljs-attr">traits</span>: {<span class="hljs-attr">eyes</span>: <span class="hljs-string">'blue'</span>, <span class="hljs-attr">shoe_size</span>: <span class="hljs-number">10</span>},
};
AsyncStorage.setItem(<span class="hljs-string">'UID123'</span>, <span class="hljs-built_in">JSON</span>.stringify(UID123_object), () =&gt; {
AsyncStorage.mergeItem(<span class="hljs-string">'UID123'</span>, <span class="hljs-built_in">JSON</span>.stringify(UID123_delta), () =&gt; {
AsyncStorage.getItem(<span class="hljs-string">'UID123'</span>, (err, result) =&gt; {
<span class="hljs-built_in">console</span>.log(result);
});
});
});
<span class="hljs-comment">// Console log result:</span>
<span class="hljs-comment">// =&gt; {'name':'Chris','age':31,'traits':</span>
<span class="hljs-comment">// {'shoe_size':10,'hair':'brown','eyes':'blue'}}</span>
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" name="clear"></a><a href="#clear" aria-hidden="true" class="hash-link" ><svg 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><code>clear()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> clear([callback]: ?<span class="hljs-function">(<span class="hljs-params">error: ?<span class="hljs-built_in">Error</span></span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<p>Erases <em>all</em> <code>AsyncStorage</code> for all clients, libraries, etc. You probably don't want to call this; use <code>removeItem</code> or <code>multiRemove</code> to clear only your app's keys. Returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>callback</td><td>?(error: ?Error) =&gt; void</td><td>No</td><td>Function that will be called with any error.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" name="getallkeys"></a><a href="#getallkeys" aria-hidden="true" class="hash-link" ><svg 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><code>getAllKeys()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> getAllKeys([callback]: ?<span class="hljs-function">(<span class="hljs-params">error: ?<span class="hljs-built_in">Error</span>, keys: ?<span class="hljs-built_in">Array</span>&lt;string&gt;</span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<p>Gets <em>all</em> keys known to your app; for all callers, libraries, etc. Returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>callback</td><td>?(error: ?Error, keys: ?Array<string>) =&gt; void</td><td>No</td><td>Function that will be called the keys found and any error.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" name="flushgetrequests"></a><a href="#flushgetrequests" aria-hidden="true" class="hash-link" ><svg 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><code>flushGetRequests()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> flushGetRequests(): [object <span class="hljs-built_in">Object</span>]
</code></pre>
<p>Flushes any pending requests using a single batch call to get the data.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="multiget"></a><a href="#multiget" aria-hidden="true" class="hash-link" ><svg 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><code>multiGet()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> multiGet(keys: <span class="hljs-built_in">Array</span>&lt;string&gt;, [callback]: ?<span class="hljs-function">(<span class="hljs-params">errors: ?<span class="hljs-built_in">Array</span>&lt;<span class="hljs-built_in">Error</span>&gt;, result: ?<span class="hljs-built_in">Array</span>&lt;<span class="hljs-built_in">Array</span>&lt;string&gt;&gt;</span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<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>
<pre><code class="hljs">multiGet([<span class="hljs-string">'k1'</span>, <span class="hljs-string">'k2'</span>], cb) -&gt; cb([[<span class="hljs-string">'k1'</span>, <span class="hljs-string">'val1'</span>], [<span class="hljs-string">'k2'</span>, <span class="hljs-string">'val2'</span>]])
</code></pre>
<p>The method returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>keys</td><td>Array<string></td><td>Yes</td><td>Array of key for the items to get.</td></tr>
<tr><td>callback</td><td>?(errors: ?Array<Error>, result: ?Array&lt;Array<string>&gt;) =&gt; void</td><td>No</td><td>Function that will be called with a key-value array of the results, plus an array of any key-specific errors found.</td></tr>
</tbody>
</table>
<p>Example:</p>
<pre><code class="hljs css javascript">AsyncStorage.getAllKeys(<span class="hljs-function">(<span class="hljs-params">err, keys</span>) =&gt;</span> {
AsyncStorage.multiGet(keys, (err, stores) =&gt; {
stores.map(<span class="hljs-function">(<span class="hljs-params">result, i, store</span>) =&gt;</span> {
<span class="hljs-comment">// get at each store's key/value so you can work with it</span>
<span class="hljs-keyword">let</span> key = store[i][<span class="hljs-number">0</span>];
<span class="hljs-keyword">let</span> value = store[i][<span class="hljs-number">1</span>];
});
});
});
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" name="multiset"></a><a href="#multiset" aria-hidden="true" class="hash-link" ><svg 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><code>multiSet()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> multiSet(keyValuePairs: <span class="hljs-built_in">Array</span>&lt;<span class="hljs-built_in">Array</span>&lt;string&gt;&gt;, [callback]: ?<span class="hljs-function">(<span class="hljs-params">errors: ?<span class="hljs-built_in">Array</span>&lt;<span class="hljs-built_in">Error</span>&gt;</span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<p>Use this as a batch operation for storing multiple key-value pairs. When the operation completes you'll get a single callback with any errors:</p>
<pre><code class="hljs">multiSet([[<span class="hljs-string">'k1'</span>, <span class="hljs-string">'val1'</span>], [<span class="hljs-string">'k2'</span>, <span class="hljs-string">'val2'</span>]], cb);
</code></pre>
<p>The method returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>keyValuePairs</td><td>Array&lt;Array<string>&gt;</td><td>Yes</td><td>Array of key-value array for the items to set.</td></tr>
<tr><td>callback</td><td>?(errors: ?Array<Error>) =&gt; void</td><td>No</td><td>Function that will be called with an array of any key-specific errors found.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" name="multiremove"></a><a href="#multiremove" aria-hidden="true" class="hash-link" ><svg 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><code>multiRemove()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> multiRemove(keys: <span class="hljs-built_in">Array</span>&lt;string&gt;, [callback]: ?<span class="hljs-function">(<span class="hljs-params">errors: ?<span class="hljs-built_in">Array</span>&lt;<span class="hljs-built_in">Error</span>&gt;</span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<p>Call this to batch the deletion of all keys in the <code>keys</code> array. Returns a <code>Promise</code> object.</p>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>keys</td><td>Array<string></td><td>Yes</td><td>Array of key for the items to delete.</td></tr>
<tr><td>callback</td><td>?(errors: ?Array<Error>) =&gt; void</td><td>No</td><td>Function that will be called an array of any key-specific errors found.</td></tr>
</tbody>
</table>
<p>Example:</p>
<pre><code class="hljs css javascript"><span class="hljs-keyword">let</span> keys = [<span class="hljs-string">'k1'</span>, <span class="hljs-string">'k2'</span>];
AsyncStorage.multiRemove(keys, err =&gt; {
<span class="hljs-comment">// keys k1 &amp; k2 removed, if they existed</span>
<span class="hljs-comment">// do most stuff after removal (if you want)</span>
});
</code></pre>
<hr>
<h3><a class="anchor" aria-hidden="true" name="multimerge"></a><a href="#multimerge" aria-hidden="true" class="hash-link" ><svg 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><code>multiMerge()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> multiMerge(keyValuePairs: <span class="hljs-built_in">Array</span>&lt;<span class="hljs-built_in">Array</span>&lt;string&gt;&gt;, [callback]: ?<span class="hljs-function">(<span class="hljs-params">errors: ?<span class="hljs-built_in">Array</span>&lt;<span class="hljs-built_in">Error</span>&gt;</span>) =&gt;</span> <span class="hljs-keyword">void</span>)
</code></pre>
<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>
<p><strong>Parameters:</strong></p>
<table>
<thead>
<tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>keyValuePairs</td><td>Array&lt;Array<string>&gt;</td><td>Yes</td><td>Array of key-value array for the items to merge.</td></tr>
<tr><td>callback</td><td>?(errors: ?Array<Error>) =&gt; void</td><td>No</td><td>Function that will be called with an array of any key-specific errors found.</td></tr>
</tbody>
</table>
<p>Example:</p>
<pre><code class="hljs css javascript"><span class="hljs-comment">// first user, initial values</span>
<span class="hljs-keyword">let</span> UID234_object = {
<span class="hljs-attr">name</span>: <span class="hljs-string">'Chris'</span>,
<span class="hljs-attr">age</span>: <span class="hljs-number">30</span>,
<span class="hljs-attr">traits</span>: {<span class="hljs-attr">hair</span>: <span class="hljs-string">'brown'</span>, <span class="hljs-attr">eyes</span>: <span class="hljs-string">'brown'</span>},
};
<span class="hljs-comment">// first user, delta values</span>
<span class="hljs-keyword">let</span> UID234_delta = {
<span class="hljs-attr">age</span>: <span class="hljs-number">31</span>,
<span class="hljs-attr">traits</span>: {<span class="hljs-attr">eyes</span>: <span class="hljs-string">'blue'</span>, <span class="hljs-attr">shoe_size</span>: <span class="hljs-number">10</span>},
};
<span class="hljs-comment">// second user, initial values</span>
<span class="hljs-keyword">let</span> UID345_object = {
<span class="hljs-attr">name</span>: <span class="hljs-string">'Marge'</span>,
<span class="hljs-attr">age</span>: <span class="hljs-number">25</span>,
<span class="hljs-attr">traits</span>: {<span class="hljs-attr">hair</span>: <span class="hljs-string">'blonde'</span>, <span class="hljs-attr">eyes</span>: <span class="hljs-string">'blue'</span>},
};
<span class="hljs-comment">// second user, delta values</span>
<span class="hljs-keyword">let</span> UID345_delta = {
<span class="hljs-attr">age</span>: <span class="hljs-number">26</span>,
<span class="hljs-attr">traits</span>: {<span class="hljs-attr">eyes</span>: <span class="hljs-string">'green'</span>, <span class="hljs-attr">shoe_size</span>: <span class="hljs-number">6</span>},
};
<span class="hljs-keyword">let</span> multi_set_pairs = [
[<span class="hljs-string">'UID234'</span>, <span class="hljs-built_in">JSON</span>.stringify(UID234_object)],
[<span class="hljs-string">'UID345'</span>, <span class="hljs-built_in">JSON</span>.stringify(UID345_object)],
];
<span class="hljs-keyword">let</span> multi_merge_pairs = [
[<span class="hljs-string">'UID234'</span>, <span class="hljs-built_in">JSON</span>.stringify(UID234_delta)],
[<span class="hljs-string">'UID345'</span>, <span class="hljs-built_in">JSON</span>.stringify(UID345_delta)],
];
AsyncStorage.multiSet(multi_set_pairs, err =&gt; {
AsyncStorage.multiMerge(multi_merge_pairs, err =&gt; {
AsyncStorage.multiGet([<span class="hljs-string">'UID234'</span>, <span class="hljs-string">'UID345'</span>], (err, stores) =&gt; {
stores.map(<span class="hljs-function">(<span class="hljs-params">result, i, store</span>) =&gt;</span> {
<span class="hljs-keyword">let</span> key = store[i][<span class="hljs-number">0</span>];
<span class="hljs-keyword">let</span> val = store[i][<span class="hljs-number">1</span>];
<span class="hljs-built_in">console</span>.log(key, val);
});
});
});
});
<span class="hljs-comment">// Console log results:</span>
<span class="hljs-comment">// =&gt; UID234 {"name":"Chris","age":31,"traits":{"shoe_size":10,"hair":"brown","eyes":"blue"}}</span>
<span class="hljs-comment">// =&gt; UID345 {"name":"Marge","age":26,"traits":{"shoe_size":6,"hair":"blonde","eyes":"green"}}</span>
</code></pre>
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