node.js script to connect mattermost websockets and listen for events

websocket.js

const WebSocket = require('ws');

var ws = new WebSocket("ws://YourMattermostServer:8065/api/v4/websocket");

ws.on('open', function open(){
  var msg = {
  "seq": 1,
  "action": "authentication_challenge",
  "data": {
    "token": "YourTokenFromTheMattermostCookie"
    }
  };
  ws.send(JSON.stringify(msg));
});

ws.onmessage = function (event) {
  var sortedKeys = Object.keys(event).sort();;
  var obj = JSON.parse(event.data);
  console.log(event.data);
  if(obj.event == "channel_created"){
    console.log("New channel created...")
  }
  else if (obj.event == "channel_viewed") {
    console.log("Channel was viewed...")
  }
}

thank you !