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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>AsyncStorage · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="`AsyncStorage` is an unencrypted, asynchronous, persistent, key-value storage system that is global to the app. It should be used instead of LocalStorage."/><meta name="docsearch:version" content="0.8"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="AsyncStorage · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://reactnative.dev/"/><meta property="og:description" content="`AsyncStorage` is an unencrypted, asynchronous, persistent, key-value storage system that is global to the app. It should be used instead of LocalStorage."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/img/favicon.ico"/><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://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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<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 facade that provides a clear JavaScript API, real <code>Error</code> objects, and non-multi functions. Each method in the API returns a <code>Promise</code> object.</p>
<p>Persisting data:</p>
<pre><code class="hljs css language-jsx"><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">'@MySuperStore:key'</span><span class="token punctuation">,</span>
<span class="token string">'I like to save it.'</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>error<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// Error saving data</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Fetching data:</p>
<pre><code class="hljs css language-jsx"><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">'@MySuperStore:key'</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">// 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>error<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// Error retrieving data</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Merging data:</p>
<pre><code class="hljs css language-jsx"><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">'Chris'</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">'brown'</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">'brown'</span> <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// 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">'blue'</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">'UID123'</span><span class="token punctuation">,</span>
<span class="token constant">JSON</span><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">=></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">'UID123'</span><span class="token punctuation">,</span>
<span class="token constant">JSON</span><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">=></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">'UID123'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> result</span><span class="token punctuation">)</span> <span class="token operator">=></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">// Console log result:</span>
<span class="token comment">// => {'name':'Chris','age':31,'traits':</span>
<span class="token comment">// {'shoe_size':10,'hair':'brown','eyes':'blue'}}</span>
</code></pre>
<p>Multi merge example:</p>
<pre><code class="hljs css language-jsx"><span class="token comment">// 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">'Chris'</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">'brown'</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">'brown'</span> <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// 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">'blue'</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 comment">// 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">'Marge'</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">'blonde'</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">'blue'</span> <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// 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">'green'</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 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">'UID234'</span><span class="token punctuation">,</span> <span class="token constant">JSON</span><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">'UID345'</span><span class="token punctuation">,</span> <span class="token constant">JSON</span><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 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">'UID234'</span><span class="token punctuation">,</span> <span class="token constant">JSON</span><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">'UID345'</span><span class="token punctuation">,</span> <span class="token constant">JSON</span><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><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><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token operator">=></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><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token operator">=></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">'UID234'</span><span class="token punctuation">,</span> <span class="token string">'UID345'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> stores</span><span class="token punctuation">)</span> <span class="token operator">=></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><span class="token parameter">result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store</span><span class="token punctuation">)</span> <span class="token operator">=></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">// Console log results:</span>
<span class="token comment">// => UID234 {"name":"Chris","age":31,"traits":{"shoe_size":10,"hair":"brown","eyes":"blue"}}</span>
<span class="token comment">// => UID345 {"name":"Marge","age":26,"traits":{"shoe_size":6,"hair":"blonde","eyes":"green"}}</span>
</code></pre>
<p>Fetching multiple items:</p>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">getAllKeys</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> keys</span><span class="token punctuation">)</span> <span class="token operator">=></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><span class="token parameter">err<span class="token punctuation">,</span> stores</span><span class="token punctuation">)</span> <span class="token operator">=></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><span class="token parameter">result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// get at each store'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>
</code></pre>
<p>Removing multiple items:</p>
<pre><code class="hljs css language-jsx"><span class="token keyword">let</span> keys <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'k1'</span><span class="token punctuation">,</span> <span class="token string">'k2'</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><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// keys k1 & k2 removed, if they existed</span>
<span class="token comment">// do most stuff after removal (if you want)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="methods"></a><a href="#methods" 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>Methods</h3>
<ul>
<li><a href="/docs/0.8/asyncstorage#getitem"><code>getItem</code></a></li>
<li><a href="/docs/0.8/asyncstorage#setitem"><code>setItem</code></a></li>
<li><a href="/docs/0.8/asyncstorage#removeitem"><code>removeItem</code></a></li>
<li><a href="/docs/0.8/asyncstorage#mergeitem"><code>mergeItem</code></a></li>
<li><a href="/docs/0.8/asyncstorage#clear"><code>clear</code></a></li>
<li><a href="/docs/0.8/asyncstorage#getallkeys"><code>getAllKeys</code></a></li>
</ul>
<p>The following batched functions are useful for executing a lot of operations at once, allowing for native optimizations and provide the convenience of a single callback after all operations are complete.</p>
<p>These functions return arrays of errors, potentially one for every key. For key-specific errors, the Error object will have a key property to indicate which key caused the error.</p>
<ul>
<li><a href="/docs/0.8/asyncstorage#flushgetrequests"><code>flushGetRequests</code></a></li>
<li><a href="/docs/0.8/asyncstorage#multiget"><code>multiGet</code></a></li>
<li><a href="/docs/0.8/asyncstorage#multiset"><code>multiSet</code></a></li>
<li><a href="/docs/0.8/asyncstorage#multiremove"><code>multiRemove</code></a></li>
<li><a href="/docs/0.8/asyncstorage#multimerge"><code>multiMerge</code></a></li>
</ul>
<hr>
<h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" 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>Reference</h1>
<h2><a class="anchor" aria-hidden="true" id="methods-1"></a><a href="#methods-1" 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>Methods</h2>
<h3><a class="anchor" aria-hidden="true" id="getitem"></a><a href="#getitem" 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><code>getItem()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> <span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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, result) => 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" id="setitem"></a><a href="#setitem" 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><code>setItem()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> value<span class="token punctuation">,</span> <span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Sets the value for a <code>key</code> and invokes a callback upon completion.</p>
<p>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) => void</td><td>No</td><td>Function that will be called with any error.</td></tr>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" id="removeitem"></a><a href="#removeitem" 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><code>removeItem()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">removeItem</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> <span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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) => 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" id="mergeitem"></a><a href="#mergeitem" 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><code>mergeItem()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">mergeItem</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> value<span class="token punctuation">,</span> <span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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>
<blockquote>
<p>Note: This is not supported by all native implementations.</p>
</blockquote>
<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) => 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" id="clear"></a><a href="#clear" 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><code>clear()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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) => 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" id="getallkeys"></a><a href="#getallkeys" 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><code>getAllKeys()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">getAllKeys</span><span class="token punctuation">(</span><span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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, keys) => void</td><td>No</td><td>Function that will be called with an array of keys found, and any error.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" id="flushgetrequests"></a><a href="#flushgetrequests" 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><code>flushGetRequests()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">flushGetRequests</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</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" id="multiget"></a><a href="#multiget" 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><code>multiGet()</code></h3>
<pre><code class="hljs css language-jsx">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>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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) -> 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, result) => 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>
<hr>
<h3><a class="anchor" aria-hidden="true" id="multiset"></a><a href="#multiset" 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><code>multiSet()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">multiSet</span><span class="token punctuation">(</span>keyValuePairs<span class="token punctuation">,</span> <span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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<Array<string>></td><td>Yes</td><td>Array of key-value array for the items to set.</td></tr>
<tr><td>callback</td><td>(errors) => 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" id="multiremove"></a><a href="#multiremove" 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><code>multiRemove()</code></h3>
<pre><code class="hljs css language-jsx">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>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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) => void</td><td>No</td><td>Function that will be called an array of any key-specific errors found.</td></tr>
</tbody>
</table>
<hr>
<h3><a class="anchor" aria-hidden="true" id="multimerge"></a><a href="#multimerge" 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><code>multiMerge()</code></h3>
<pre><code class="hljs css language-jsx">AsyncStorage<span class="token punctuation">.</span><span class="token function">multiMerge</span><span class="token punctuation">(</span>keyValuePairs<span class="token punctuation">,</span> <span class="token punctuation">[</span>callback<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</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<Array<string>></td><td>Yes</td><td>Array of key-value array for the items to merge.</td></tr>
<tr><td>callback</td><td>(errors) => void</td><td>No</td><td>Function that will be called with an array of any key-specific errors found.</td></tr>
</tbody>
</table>
</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#methods-1">Methods</a><ul class="toc-headings"><li><a href="#getitem"><code>getItem()</code></a></li><li><a href="#setitem"><code>setItem()</code></a></li><li><a href="#removeitem"><code>removeItem()</code></a></li><li><a href="#mergeitem"><code>mergeItem()</code></a></li><li><a href="#clear"><code>clear()</code></a></li><li><a href="#getallkeys"><code>getAllKeys()</code></a></li><li><a href="#flushgetrequests"><code>flushGetRequests()</code></a></li><li><a href="#multiget"><code>multiGet()</code></a></li><li><a href="#multiset"><code>multiSet()</code></a></li><li><a href="#multiremove"><code>multiRemove()</code></a></li><li><a href="#multimerge"><code>multiMerge()</code></a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/docs/getting-started">Getting Started</a><a href="/docs/tutorial">Tutorial</a><a href="/docs/components-and-apis">Components and APIs</a><a href="/docs/more-resources">More Resources</a></div><div><h5>Community</h5><a href="/help">The React Native Community</a><a href="/showcase">Who's using React Native?</a><a href="https://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/blog">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="https://reactjs.org" target="_blank">React</a></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 © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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