The ServiceWorkerGlobalScope.onmessage event of the ServiceWorkerGlobalScope interface is called whenever incoming messages are received.

Note: Messages sent to service worker contexts (e.g. as the event object of onmessage) are represented by MessageEvent objects in modern browsers, for consistency with other web messaging features. (They used to be represented by ServiceWorkerMessageEvent objects, which have now been deprecated.)


ServiceWorkerGlobalScope.onmessage = function(MessageEvent) { ... }


self.addEventListener('message', function(messageEvent) {
  console.log('Handling message event:', messageEvent);


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support40 ?441 No24 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support4040 ?4424 No4.0

1. Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR).

Document Tags and Contributors

Last updated by: zbjornson,