PushSubscriptionOptions: applicationServerKey property

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 applicationServerKey read-only property of the PushSubscriptionOptions interface contains the public key used by the push server.


A public key your push server uses to send messages to client apps via a push server. This value is part of a signing key pair generated by your application server, and usable with elliptic curve digital signature (ECDSA), over the P-256 curve. If no applicationServerKey member is passed when initialized, it will be set to null.


In the example below the value of applicationServerKey is printed to the console.

navigator.serviceWorker.ready.then((reg) => {
  reg.pushManager.getSubscription().then((subscription) => {
    const options = subscription.options;
    console.log(options.applicationServerKey); // the public key


Push API
# dom-pushsubscriptionoptions-applicationserverkey

Browser compatibility

BCD tables only load in the browser