ServiceWorkerGlobalScope: periodicsync event

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

The periodicsync event of the ServiceWorkerGlobalScope interface is fired at timed intervals, specified when registering a PeriodicSyncManager.

This event is not cancelable and does not bubble.


Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("periodicsync", (event) => {});

onperiodicsync = (event) => {};

Event type

Event properties

Inherits properties from its ancestor, Event.

PeriodicSyncEvent.tag Read only

Returns the developer-defined identifier for this PeriodicSyncEvent. Multiple tags can be used by the web app to run different periodic tasks at different frequencies.


The following example shows how to respond to a periodic sync event in the service worker.

self.addEventListener("periodicsync", (event) => {
  if (event.tag === "get-latest-news") {

You can also set up the event handler using the onperiodicsync property:

self.onperiodicsync = (event) => {
  // ...


Web Periodic Background Synchronization
# periodicsync-event
Web Periodic Background Synchronization
# dom-serviceworkerglobalscope-onperiodicsync

Browser compatibility

BCD tables only load in the browser

See also