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"Hello world!" with socket messages

Install node modules

npm install express
npm install Socket io
click below button to copy the code. By Socket tutorial team

Node.js server

const express = require('express'); 
const app = express();
const server = app.listen(3000,console.log("Socket io Hello Wolrd server started!"));
const io = require('Socket io')(server);

io.on('connection', (socket) => {
    //console.log("Client connected!");
    socket.on('message-from-client-to-server', (msg) => {
    socket.emit('message-from-server-to-client', 'Hello World!');
click below button to copy the code. By Socket tutorial team

Browser client

<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <title>Hello World with Socket io</title>
    <script src="https://cdn.Socket io/Socket io-1.4.5.js"></script>
      var socket = io("http://localhost:3000");
      socket.on("message-from-server-to-client", function(msg) {
          document.getElementById('message').innerHTML = msg;
      socket.emit('message-from-client-to-server', 'Hello World!');
    <p> Hello World client started!</p>
    <p id="message"></p>
click below button to copy the code. By Socket tutorial team
  • In the above example, the path to the Socket io library is defined as /Socket io/Socket io.js.

Even though we didn't write any code to serve the Socket io library, Socket io automatically does that.

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