---
title: ServiceWorkerRegistration
slug: Web/API/ServiceWorkerRegistration
tags:
  - API
  - Draft
  - Interface
  - NeedsTranslation
  - Offline
  - Reference
  - Service Workers
  - ServiceWorkerRegistration
  - TopicStub
  - Workers
translation_of: Web/API/ServiceWorkerRegistration
---
<div>
<div>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</div>
</div>

<p>The <code>ServiceWorkerRegistration</code> interface of the <a href="/en-US/docs/Web/API/ServiceWorker_API">ServiceWorker API</a> represents the service worker registration. You register a service worker to control one or more pages that share the same origin.</p>

<p>The lifetime of a service worker registration is beyond that of the <code>ServiceWorkerRegistration</code> objects that represent them within the lifetime of their corresponding service worker clients. The browser maintains a persistent list of active <code>ServiceWorkerRegistration</code> objects.</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="Properties">Properties</h2>

<p><em>Also implements properties from its parent interface, </em>{{domxref("EventTarget")}}.</p>

<dl>
 <dt>{{domxref("ServiceWorkerRegistration.scope")}} {{readonlyinline}}</dt>
 <dd>Returns a unique identifier for a service worker registration. This must be on the same origin as the document that registers the {{domxref("ServiceWorker")}}.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.installing")}} <strong style="font-weight: bold;">{{readonlyinline}}</strong></dt>
 <dd>Returns a service worker whose state is <code>installing</code>. This is initially set to <code>null</code>.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.waiting")}} <strong style="font-weight: bold;">{{readonlyinline}}</strong></dt>
 <dd>Returns a service worker whose state is <code>installed</code>. This is initially set to <code>null</code>.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.active")}} <strong style="font-weight: bold;">{{readonlyinline}}</strong></dt>
 <dd>Returns a service worker whose state is either <code>activating</code> or <code>activated</code>. This is initially set to <code>null</code>. An active worker will control 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.)</dd>
 <dt>{{domxref("serviceWorkerRegistration.periodicSync")}} {{non-standard_inline}} {{readonlyinline}}</dt>
 <dd>Returns a reference to the {{domxref("PeriodicSyncManager")}} interface, which manages periodic background synchronization processes.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.pushManager")}} {{readonlyinline}}</dt>
 <dd>Returns a reference to the {{domxref("PushManager")}} interface for managing push subscriptions including subscribing, getting an active subscription, and accessing push permission status.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.sync")}} <strong style="font-weight: bold; line-height: 19.0909080505371px;">{{non-standard_inline}} </strong>{{readonlyinline}} </dt>
 <dd>Returns a reference to the {{domxref("SyncManager")}} interface, which manages background synchronization processes.</dd>
</dl>

<h3 id="Event_handlers">Event handlers</h3>

<dl>
 <dt>{{domxref("ServiceWorkerRegistration.onupdatefound")}} {{readonlyinline}}</dt>
 <dd>An <a href="https://developer.mozilla.org/en-US/docs/Web/API/EventListener" title="This method is called whenever an event occurs of the type for which the EventListener interface was registered."><code>EventListener</code></a> property called whenever an event of type <code>updatefound</code> is fired; it is fired any time the {{domxref("ServiceWorkerRegistration.installing")}} property acquires a new service worker.</dd>
</dl>

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

<p><em>Also implements methods from its parent interface, </em>{{domxref("EventTarget")}}.</p>

<dl>
 <dt>{{domxref("ServiceWorkerRegistration.getNotifications()")}}</dt>
 <dd>Returns a {{jsxref("Promise")}} that resolves to an array of {{domxref("Notification")}} objects.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.showNotification()")}}</dt>
 <dd>Displays the notification with the requested title.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.update()")}}</dt>
 <dd>Checks the server for an updated version of the service worker without consulting caches.</dd>
 <dt>{{domxref("ServiceWorkerRegistration.unregister()")}}</dt>
 <dd>Unregisters the service worker registration and returns a promise (see {{jsxref("Promise")}}). The service worker will finish any ongoing operations before it is unregistered.</dd>
</dl>

<h2 id="Examples">Examples</h2>

<p>This code snippet is from the <a href="https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/registration-events/index.html">service worker registration-events sample</a> (<a class="external external-icon" href="https://googlechrome.github.io/samples/service-worker/registration-events/">live demo</a>). The code checks to see if the browser supports service workers and if there's currently a service worker handling requests on this page for the current navigation.</p>

<p>Any new service workers are registered; if there's an existing service worker, the code overrides its default scope so that the registration applies to the current directory and everything underneath it. The example also reports any registration failures.</p>

<pre class="brush: js">if ('serviceWorker' in navigator) {
  document.querySelector('#availability').innerText = 'are';
  document.querySelector('#controlled').innerText = navigator.serviceWorker.controller ? 'is' : 'is not';
  navigator.serviceWorker.register('service-worker.js', {scope: './'}).then(function(registration) {
    document.querySelector('#register').textContent = 'succeeded';
  }).catch(function(error) {
    document.querySelector('#register').textContent = 'failed: ' + error;
  });
} else {
  document.querySelector('#availability').innerText = 'are not';
}</pre>

<h2 id="Specifications">Specifications</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('Service Workers', '#service-worker-registration-obj', 'ServiceWorkerRegistration')}}</td>
   <td>{{Spec2('Service Workers')}}</td>
   <td>Initial definition.</td>
  </tr>
  <tr>
   <td>{{SpecName('Push API', '#widl-ServiceWorkerRegistration-pushManager', 'PushManager')}}</td>
   <td>{{Spec2('Push API')}}</td>
   <td>Adds the {{domxref("PushManager","pushManager")}} property.</td>
  </tr>
  <tr>
   <td>{{SpecName('Web Notifications')}}</td>
   <td>{{Spec2('Web Notifications')}}</td>
   <td>Adds the {{domxref("ServiceWorkerRegistration.showNotification()","showNotification()")}} method and the {{domxref("ServiceWorkerRegistration.getNotifications()","getNotifications()")}} method.</td>
  </tr>
  <tr>
   <td>{{SpecName('Background Sync')}}</td>
   <td>{{Spec2('Background Sync')}}</td>
   <td>Adds the {{domxref("ServiceWorkerRegistration.sync","sync")}} property.</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>
  <tr>
   <td><code>getNotifications()</code>, <code>showNotification()</code></td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop("46.0")}}<sup>[1]</sup></td>
   <td>{{CompatNo}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatNo}}</td>
  </tr>
  <tr>
   <td><code>sync</code> property</td>
   <td>{{CompatChrome(49.0)}}</td>
   <td> </td>
   <td> </td>
   <td> </td>
   <td> </td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Android Webview</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>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{ CompatGeckoMobile("44.0") }}</td>
   <td>{{ CompatVersionUnknown }}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatChrome(40.0)}}</td>
  </tr>
  <tr>
   <td>Available in web workers</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoMobile("44.0")}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
  <tr>
   <td><code>getNotifications()</code>, <code>showNotification()</code></td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoMobile("46.0")}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
  <tr>
   <td><code>sync</code> property</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td> </td>
   <td> </td>
   <td> </td>
   <td> </td>
   <td> </td>
   <td>{{CompatChrome(49.0)}}</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>