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+---
+title: ServiceWorkerRegistration.active
+slug: Web/API/ServiceWorkerRegistration/active
+translation_of: Web/API/ServiceWorkerRegistration/active
+---
+<div>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</div>
+
+<p>The <strong><code>active</code></strong> property of the {{domxref("ServiceWorkerRegistration")}} interface returns a service worker whose {{domxref("ServiceWorker.state")}} is <code style="font-style: normal;">activating</code> or <code style="font-style: normal;">activated</code>. This property is initially set to <code style="font-style: normal;">null</code>.</p>
+
+<p>An active worker controls a {{domxref("ServiceWorkerClient")}} if the client's URL falls within the scope of the registration (the <code>scope</code> option set when {{domxref("ServiceWorkerContainer.register")}} is first called.)</p>
+
+<div class="note">
+<p><strong>Note</strong>: This feature is available in <a href="/en-US/docs/Web/API/Web_Workers_API">Web Workers</a>.</p>
+</div>
+
+<h2 id="Syntax" name="Syntax" style="line-height: 30px; font-size: 2.14285714285714rem;">Syntax</h2>
+
+<pre class="syntaxbox" style="font-size: 14px;">sw = ServiceWorker.active
+</pre>
+
+<h3 id="Value">Value</h3>
+
+<p>A {{domxref("ServiceWorker")}} object, if it is currently in an <code>activating</code> or <code>activated</code> state.</p>
+
+<h2 id="Specifications" style="line-height: 30px; font-size: 2.14285714285714rem;">Specifications</h2>
+
+<div> </div>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col"><font face="Open Sans, sans-serif"><span style="font-weight: normal;">Specification</span></font></th>
+   <th scope="col"><font face="Open Sans, sans-serif"><span style="font-weight: normal;">Status</span></font></th>
+   <th scope="col"><font face="Open Sans, sans-serif"><span style="font-weight: normal;">Comment</span></font></th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Service Workers', '#service-worker-registration-active-attribute', 'ServiceWorkerRegistration.active')}}</td>
+   <td>{{Spec2('Service Workers')}}</td>
+   <td>Initial definition.<br>
+     </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<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 (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(40.0)}}</td>
+   <td>{{ CompatGeckoDesktop("44.0") }}<sup>[1]</sup></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td>Available in web workers</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("44.0")}}<sup>[1]</sup></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{ CompatGeckoMobile("44.0") }}</td>
+   <td>{{ CompatVersionUnknown }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td>Available in web workers</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Service workers (and <a href="/en-US/docs/Web/API/Push_API">Push</a>) have been disabled in the <a href="https://www.mozilla.org/en-US/firefox/organizations/">Firefox 45 and 52 Extended Support Releases</a> (ESR.)</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/ServiceWorker_API/Using_Service_Workers">Using Service Workers</a></li>
+ <li><a href="https://github.com/mdn/sw-test">Service workers basic code example</a></li>
+ <li><a href="https://jakearchibald.github.io/isserviceworkerready/">Is ServiceWorker ready?</a></li>
+ <li>{{jsxref("Promise")}}</li>
+ <li><a href="/en-US/docs/Web/Guide/Performance/Using_web_workers">Using web workers</a></li>
+</ul>