In this chapter, we learned about socket.io and worked through some very basic concepts and APIs provided by socket.io. We also saw how to set up socket.io on the server and the client, and how to send and receive messages. While doing so, we also built a chat room application using all that we have learned up to this point.

In the next chapter we will build upon the application that we have created to add other features such as session data, multiple chat rooms, namespacing, and authentication while getting acquainted with the related features of socket.io.