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.


var key = subscription.getKey(name);


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


An ArrayBuffer.


  .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  

  // 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');



Specification Status Comment
Push API Working Draft This is the Push API spec, but note that getKey() is not currently specified in here. It is currently Firefox-only experimental.

Browser Compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
getKey()Chrome Full support 42Edge Full support 16Firefox Full support 44
Full support 44
Notes Service workers (and Push) have been disabled in the Firefox 45 & 52 Extended Support Releases (ESR).
IE No support NoOpera Full support 29Safari No support NoWebView Android No support NoChrome Android Full support 42Firefox Android Full support 48Opera Android Full support 29Safari iOS No support NoSamsung Internet Android Full support 4.0


Full support  
Full support
No support  
No support
See implementation notes.
See implementation notes.