In this project, we'll create a chat application. This is going to be a little different than what we than we've done in any of the previous projects, and that's because we'll be using WebSockets, more specifically we'll be using socket.io. WebSockets allows us to communicate have the client and server in a different way.

There will be an open connection between the client and server. Instead of just making request-response, there will be an open connection, and that makes everything completely instant. So we can send messages to the server, and it'll update all the other clients that are connected. We'll also be able to open a tab and write a message, and open another tab and be viewing the application as a different user. Then if one user replies or writes in a message, the other one will update automatically without even having to reload.

WebSockets is a really nice technology to learn, and it's actually really easy; it's basically just events. You call separate...