PushSubscription.getKey()

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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.

Syntax

const key = subscription.getKey(name);

Parameters

name

A DOMString 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.

Returns

An ArrayBuffer.

Example

reg.pushManager.getSubscription()
  .then(function(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
  var endpoint = subscription.endpoint;
  var key = subscription.getKey('p256dh');
  var auth = subscription.getKey('auth');

    ...

Specifications

Specification
Push API # dom-pushsubscription-getkey

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`getKey`	42	16	44 Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	No	29	No	No	42	48	29	No	4.0

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https://developer.mozilla.org/en-US/docs/Web/API/PushSubscription/getKey