Express.js framework is created with JavaScript and we code which we write with it is also WRITTEN in JavaScript.Express.js. This is one of the reasons for the rise of MEAN and MERN stack, in which JavaScript knowledge can be used to learn Angular/React at Frontend, MongoDB in Database and Node.js and Express.js at the backend.

Express has an in-built route support, so a developer can write responses to specific URLs with ease. We can also pass parameters to these routes, which add to the capabilities of the app. Express also SUPPORTS multiple templating engines, through which you can generate static HTML for a web-browser. If you follow this approach, the pages will be generated by the SERVER and there will be no need to write client code in Angular or React.

Without Express.js, we would have to write complex logic in Node.js, which is both, tedious and time consuming. Express.js code is minimalistic, efficient, and easily understandable by programmers, and because of it easily SCALABLE.

Node.js programs are really fast because they implement event loops and get rid of all inefficiencies. With the power of Node.js and ease of an Express.js, we can build the backend for powerful and scalable web-apps in no time.