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The periodicSync read-only property of the ServiceWorkerRegistration interface returns a reference to the PeriodicSyncManager interface, which allows for registering of tasks to run at specific intervals.


var PeriodicSyncManagerObject = ServiceWorkerRegistration.periodicSync;


A PeriodicSyncManager Object.


You can access the property from either your main script or the registered service worker.

Here is an example from the main script:

// reference registration
const registration = await navigator.serviceWorker.ready;

// feature detection
if ('periodicSync' in registration) {

  // Background Periodic Sync functionality
  const periodicSync = registration.periodicSync;


From the service worker:

// service worker script

const periodicSync = self.registration.periodicSync;


Specification Status Comment
Web Periodic Background Synchronization
The definition of 'periodicSync' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 80Edge Full support 80Firefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android Full support 80Chrome Android Full support 80Firefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android Full support 13.0


Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.

See also