socket.js

"use strict";

const serverPort = 3000;
const http = require("http");
const express = require("express");
const app = express();
const server = http.createServer(app)
const WebSocket = require("ws");
const websocketServer = new WebSocket.Server({ server });

//when a websocket connection is established
websocketServer.on("connection", (webSocketClient) => {
  // send feedback to the incoming connection
  webSocketClient.send("The time is: ");
  setInterval(() => {
      let time = new Date();
      webSocketClient.send("the time is: " + time.toTimeString());
  }, 1000);
});

//start the web server
server.listen(serverPort, () => {
    console.log(`Websocket server started on port ` + serverPort);
});