• Initialize an empty Node.js project

npm init -y

• Add tsconfig to it

npm install typescript
npx tsc --init

• Update tsconfig

"rootDir": "./src",
"outDir": "./dist",

• Install ws

npm i ws @types/ws

Code using http library

import WebSocket, { WebSocketServer } from 'ws';
import http from 'http';

const server = http.createServer(function(request: any, response: any) {
    console.log((new Date()) + ' Received request for ' + request.url);
    response.end("hi there");
});

const wss = new WebSocketServer({ server });

wss.on('connection', function connection(ws) {
  ws.on('error', console.error);

  ws.on('message', function message(data, isBinary) {
    wss.clients.forEach(function each(client) {
      if (client.readyState === WebSocket.OPEN) {
        client.send(data, { binary: isBinary });
      }
    });
  });

  ws.send('Hello! Message From Server!!');
});

server.listen(8080, function() {
    console.log((new Date()) + ' Server is listening on port 8080');
});

Code using express

npm install express @types/express

import express from 'express'
import { WebSocketServer } from 'ws'

const app = express()
const httpServer = app.listen(8080)

const wss = new WebSocketServer({ server: httpServer });

wss.on('connection', function connection(ws) {
  ws.on('error', console.error);

  ws.on('message', function message(data, isBinary) {
    wss.clients.forEach(function each(client) {
      if (client.readyState === WebSocket.OPEN) {
        client.send(data, { binary: isBinary });
      }
    });
  });

  ws.send('Hello! Message From Server!!');
});

Code without HTTP Servers

import WebSocket, { WebSocketServer } from 'ws';

const wss = new WebSocketServer({ port: 8080 });

wss.on('connection', function connection(ws) {
  ws.on('error', console.error);

  ws.on('message', function message(data, isBinary) {
    wss.clients.forEach(function each(client) {
      if (client.readyState === WebSocket.OPEN) {
        client.send(data, { binary: isBinary });
      }
    });
  });
});