In the previous chapter, we implemented a REST API and built a server that processes various requests. Most of the chapters in this book present web technologies, applications that work in a browser with the HTTP protocol. It's interesting that Node.js can be used to produce desktop programs, and we don't have to learn a new language or use a new tool. We can continue using HTML, CSS, and JavaScript. This is a great benefit because these technologies are easy to learn and develop. Node.js is also really fast: We save a lot of time when dealing with large amounts of written modules because we don't have to deal with trivial problems. In this chapter, we will write a file browser. Our application will perform the following: