This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The register() method of the ServiceWorkerContainer interface creates or updates a ServiceWorkerRegistration for the given scriptURL.

If successful, a service worker registration ties the provided script URL to a scope, which is subsequently used for navigation matching. If the method can't return a ServiceWorkerRegistration, it returns a Promise. You can call this method unconditionally from the controlled page, i.e., you don't need to first check whether there's an active registration.


ServiceWorkerContainer.register(scriptURL, options)
  .then(function(ServiceWorkerRegistration) { ... });


The URL of the service worker script.
options Optional
An options object to provide options upon registration. Currently available options are:
  • scope: A USVString representing a URL that defines a service worker's registration scope; what range of URLs a service worker can control. This is usually a relative URL. The default value is the URL you'd get if you resolved './' using the service worker script's location as the base.


A Promise that resolves to a ServiceWorkerRegistration object.


if ('serviceWorker' in navigator) {
  navigator.serviceWorker.register('service-worker.js', {scope: './'}).then(function(registration) {
    document.querySelector('#status').textContent = 'succeeded';
  }).catch(function(error) {
    document.querySelector('#status').textContent = error;
} else {
  // The current browser doesn't support service workers.
  var aElement = document.createElement('a');
  aElement.href = '';
  aElement.textContent = 'unavailable';


Specification Status Comment
Service Workers
The definition of 'ServiceWorkerContainer' in that specification.
Working Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 40.0 44.0 (44.0)[1] No support 24 No support
Feature Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? 44.0 (44.0) (Yes) No support ? No support 40.0

[1] Service workers (and Push) have been disabled in the Firefox 45 Extended Support Release (ESR.)


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Method Reference register Référence Service Workers ServiceWorker ServiceWorkerContainer