Create a project folder for our code. Inside it, create a new directory named server.

Use a terminal or the shell command prompt to change the directory into our newly created folder.

Type the following command that will install a WebSocket server:

npm install --save ws

Create a new file named server.js under the server directory with the following content:

var port = 8000;

// Server code
var WebSocketServer = require('ws').Server;
var server = new WebSocketServer({ port: port });

server.on('connection', function(socket) {
  console.log("A connection established");
});

console.log("WebSocket server is running.");
console.log("Listening to port " + port + ".");

Open the terminal and change to the server directory.

Type the following command to execute the server:

node server.js

You should get the following result if this works:

$ node server.js 
WebSocket server is running.
Listening to port 8000.