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

PushSubscription: getKey() 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 getKey() method of the PushSubscription interface returns an ArrayBuffer representing a client public key, which can then be sent to a server and used in encrypting push message data.

name

A string representing the encryption method used to generate a client key. The value can be:

p256dh

An Elliptic curve Diffie–Hellman public key on the P-256 curve (that is, the NIST secp256r1 elliptic curve). The resulting key is an uncompressed point in ANSI X9.62 format.

auth

An authentication secret, as described in Message Encryption for Web Push.

An ArrayBuffer or null if no public key can be found.

reg.pushManager.getSubscription().then((subscription) => {
  // Enable any UI which subscribes / unsubscribes from
  // push messages.

  subBtn.disabled = false;

  if (!subscription) {
    console.log("Not yet subscribed to Push");
    // We aren't subscribed to push, so set UI
    // to allow the user to enable push
    return;
  }

  // Set your UI to show they have subscribed for
  // push messages
  subBtn.textContent = "Unsubscribe from Push Messaging";
  isPushEnabled = true;

  // initialize status, which includes setting UI elements for subscribed status
  // and updating Subscribers list via push
  const endpoint = subscription.endpoint;
  const key = subscription.getKey("p256dh");
  const auth = subscription.getKey("auth");

  // …
});

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