How catch disabling web push notification?

Question

How can I catch with serviceworker or simple js code, when user who previously allowed the web push notifications for my site disable them? For Firefox and Chrome browsers.

Answer 1

You can use the Permissions API to detect the current state of given permissions, as well as listen for changes.

This article has more detail. Here's a relevant code snippet:

navigator.permissions.query({name: 'push'}).then(function(status) {
  // Initial permission status is `status.state`

  status.onchange = function() {  
    // Status changed to `this.state`
  };
});