---
title: RandomSource
slug: Web/API/RandomSource
tags:
  - API
  - Interface
  - NeedsTranslation
  - RandomSource
  - Reference
  - TopicStub
  - Web Crypto API
translation_of: Web/API/Crypto/getRandomValues
---
<p>{{APIRef("Web Crypto API")}}</p>

<p><strong><code>RandomSource</code></strong> represents a source of cryptographically secure random numbers. It is available via the {{domxref("Crypto")}} object of the global object: {{domxref("Window.crypto")}} on Web pages, {{domxref("WorkerGlobalScope.crypto")}} in workers.</p>

<p><code>RandomSource</code> is a not an interface and no object of this type can be created.</p>

<h2 id="Properties">Properties</h2>

<p><em><code>RandomSource</code> neither defines nor inherits any property.</em></p>

<dl>
</dl>

<h2 id="Methods">Methods</h2>

<dl>
 <dt>{{ domxref("RandomSource.getRandomValues()") }}</dt>
 <dd>Fills the passed {{ domxref("ArrayBufferView") }} with cryptographically sound random values.</dd>
</dl>

<h2 id="Specification" name="Specification">Specification</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('Web Crypto API', '#dfn-RandomSource')}}</td>
   <td>{{Spec2('Web Crypto API')}}</td>
   <td>Initial definition</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_Compatibility">Browser Compatibility</h2>

<p>{{ CompatibilityTable() }}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>11.0 {{ webkitbug("22049") }}</td>
   <td>{{CompatGeckoDesktop(21)}} [1]</td>
   <td>11.0</td>
   <td>15.0</td>
   <td>3.1</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Chrome for Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{ CompatNo() }}</td>
   <td>23</td>
   <td>{{CompatGeckoMobile(21)}}</td>
   <td>{{ CompatNo() }}</td>
   <td>{{ CompatNo() }}</td>
   <td>6</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] Although the transparent <code>RandomSource</code> is only available since Firefox 26, the feature was available in Firefox 21.</p>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{ domxref("Window.crypto") }} to get a {{domxref("Crypto")}} object.</li>
 <li>{{jsxref("Math.random")}}, a non-cryptographic source of random numbers.</li>
</ul>