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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/PushSubscription/unsubscribe below:

PushSubscription: unsubscribe() method - Web APIs

PushSubscription: unsubscribe() method

Baseline 2023

Newly available

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The unsubscribe() method of the PushSubscription interface returns a Promise that resolves to a boolean value when the current subscription is successfully unsubscribed.

Syntax Parameters

None.

Return value

A Promise that resolves to a boolean value when the current subscription is successfully unsubscribed.

Examples
navigator.serviceWorker.ready.then((reg) => {
  reg.pushManager.getSubscription().then((subscription) => {
    subscription
      .unsubscribe()
      .then((successful) => {
        // You've successfully unsubscribed
      })
      .catch((e) => {
        // Unsubscribing failed
      });
  });
});
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