1 – Make sure you have node (http://nodejs.org/) and npm (https://github.com/isaacs/npm) installed in your system.
2 – Install the express framework: npm install express
3 – Install the jade templating system: npm install jade
4 – Clone the repo: git clone git://github.com/reu/express-node-chat.git
5 – cd express-node-chat
6 – node server.js
Now the a server started in localhost port 3000. Type in your browser http://localhost:3000, and voila!