We'll create a new folder for our project that will hold two files: server.js and client.html. The client.html file will provide a basic user interface and connect to the WebSocket server while server.js supplies the server-side WebSocket functionality and serves up the client.html file in response to browser requests. We also need to install the ws module. Once we've changed the directory in our new folder on the command line, we can run the following code:

npm install ws

Let's use require with the ws module and create our WebSocket server (we'll call this wss):

var WSServer = require('ws').Server,
  wss = new WSServer({port:8080});

Now that we have our WebSocket server (wss) instance, we can listen...