This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

Syntax

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

Value

A CacheStorage object.

Example

the following example shows how you'd use a cache in a service worker context to store assets offline.

this.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open('v1').then(function(cache) {
      return cache.addAll([
        '/sw-test/',
        '/sw-test/index.html',
        '/sw-test/style.css',
        '/sw-test/app.js',
        '/sw-test/image-list.js',
        '/sw-test/star-wars-logo.jpg',
        '/sw-test/gallery/',
        '/sw-test/gallery/bountyHunters.jpg',
        '/sw-test/gallery/myLittleVader.jpg',
        '/sw-test/gallery/snowTroopers.jpg'
      ]);
    })
  );
});

Specifications

Specification Status Comment
Service Workers
The definition of 'caches' in that specification.
Working Draft Defined in a WindowOrWorkerGlobalScope partial in the newest spec.
Service Workers Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 40Edge ? Firefox Full support 42
Full support 42
Full support 52
Notes
Notes caches now defined on WindowOrWorkerGlobalScope mixin.
IE No support NoOpera ? Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile ? Firefox Android Full support 42
Full support 42
Full support 52
Notes
Notes caches now defined on WindowOrWorkerGlobalScope mixin.
Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.

See also

Document Tags and Contributors

Contributors to this page: fscholz, rifai, chrisdavidmills, teoli, kscarfone
Last updated by: fscholz,