web socket server

server.js

const WebSocket = require('ws');
 
const wss = new WebSocket.Server({ port: 8080 });
 
wss.on('connection', function connection(ws) {
  ws.on('message', function incoming(message) {
    console.log('messsage received: %s', message);
   
  });
  
  setInterval(function(){
    ws.send('send notifications 5 secs once');
  }, 5000)
  
});