Let Express call File (index.html) itself.

[alokkksharmaa]

https://socket.io/docs/v4/tutorial/step-2

import express from 'express';
import { createServer} from 'node:http';
import { fileURLToPath } from 'node:url';
import { dirname, join } from 'node:path';

const app = express();
const server = createServer(app);

const __dirname = dirname(fileURLToPath(import.meta.url));

app.use(express.static(join(__dirname, 'public')));

server.listen(3030, () => {
console.log(server running at http://localhost:3030)
});