The getIds() method of the BackgroundFetchManager interface returns the IDs of all registered background fetches.

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A Promise that resolves with an Array of strings.

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The following examples shows how to retrieve the IDs of all registered background fetches. With an active service worker, use the ServiceWorkerRegistration.backgroundFetch property to access the BackgroundFetchManager object and call its getIds() method.

navigator.serviceWorker.ready.then(async (swReg) => {
  const ids = await swReg.backgroundFetch.getIds();
});