The number of unread notifications for a user with given network id

notifications.js

w = new WebSocket("wss://qa.sockets.stackexchange.com/");
w.onmessage = function(e) {
  d = JSON.parse(e.data).data;
  console.log(d);
  if (d == "hb") {
    w.send("hb");
  }
};
w.onopen = function() {
  w.send("4606062-topbar");
};