This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use 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 spec changes.

The caches read-only property of the WorkerGlobalScope interface returns the CacheStorage object associated with the current worker context. This object enables service worker functionality such as storing assets for offline use, and generating custom responses to requests.


var myCacheStorage = self.caches; // or just caches


A CacheStorage.


this.addEventListener('install', function(event) {
  event.waitUntil('v1').then(function(cache) {
      return cache.addAll(


Specification Status Comment
Service Workers Editor's Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 40.0 ? Not supported ? Not supported
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also


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

API Experimental Expérimental Property Reference Référence Service Workers Web Workers WorkerGlobalScope