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

PushManager: getSubscription() method - Web APIs

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 PushManager.getSubscription() method of the PushManager interface retrieves an existing push subscription.

It returns a Promise that resolves to a PushSubscription object containing details of an existing subscription. If no existing subscription exists, this resolves to a null value.

None.

A Promise that resolves to a PushSubscription object or null.

This code snippet is taken from a push messaging and notification sample. (No live demo is available.)

// We need the service worker registration to check for a subscription
navigator.serviceWorker.ready.then((serviceWorkerRegistration) => {
  // Do we already have a push message subscription?
  serviceWorkerRegistration.pushManager
    .getSubscription()
    .then((subscription) => {
      // Enable any UI which subscribes / unsubscribes from
      // push messages.
      const pushButton = document.querySelector(".js-push-button");
      pushButton.disabled = false;

      if (!subscription) {
        // We aren't subscribed to push, so set UI
        // to allow the user to enable push
        return;
      }

      // Keep your server in sync with the latest subscriptionId
      sendSubscriptionToServer(subscription);

      showCurlCommand(subscription);

      // Set your UI to show they have subscribed for
      // push messages
      pushButton.textContent = "Disable Push Messages";
      isPushEnabled = true;
    })
    .catch((err) => {
      console.error(`Error during getSubscription(): ${err}`);
    });
});

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