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

This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The FetchEvent.client read-only property returns the Client that the current service worker is controlling.

Note: This feature has been deprecated, with its functionality replaced by FetchEvent.clientId and Clients.get(). See this Github issue for discussion/background.


var myClient = FetchEvent.client;


A Client object.


self.addEventListener('fetch', function(event) {


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support42 ?44 No24 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ?44 ? No ? No4.0

See also

Document Tags and Contributors

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