ExpressJS is the framework of choice to build of web applications using NodeJS technology. ExpressJS facilitates the building of server applications and acts as the glue between front-end applications, databases and other data-sources. ExpressJS (a constituent of the MEAN family) ended the age-old concept using JavaScript as the programming language for adding interactivity on the front end only.
ExpressJS and Node.js provide back-end functionality which allows developers to build a web application with JavaScript on the server side. Developers can now build server-side applications with Node.js and then publish the NodeJS apps as websites using the ExpressJS framework.
The ExpressJS framework can be layered with a built-in structure and functions required in building a website. The lightweight framework avails developers with built-in features for web apps and the Express API that complements a robust and feature-laden Node.js platform.