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The Working of the Background Sync API

Explore how to use the Background Sync API to register tasks that synchronize data in the background once internet connection is available. Understand the registration process, the use of sync tags, and how to handle sync events within service workers to ensure reliable offline web app functionality.

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Using the Background Sync API

To use the Background Sync API, we first need to register our synchronization task using the register() method of the SyncManager interface, which returns a Promise that resolves with a SyncRegistration object. Here’s an example:

Node.js
navigator.serviceWorker.register('service-worker.js')
  .then(registration => registration.sync.register('my-sync-tag'))
  .catch(err => console.error(err));

In this example, we passed a string, my-sync-tag, to the register() method that identifies our sync operation. This string, known as a sync tag, is ...