Express.js Software Express.js, or simply Express, is a back end web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js. What is require (' express ') in node JS? Importing and creating modules. A module is a JavaScript library/file that you can import into other code using Node's require() function. ... First we invoke the require() function, specifying the name of the module as a string ( 'express' ), and calling the returned object to create an Express application. s node JS and express JS same? Node. js is a platform for building the i/o applications which are server-side event-driven and made using JavaScript. Express. js is a framework based on Node. What is node Express used for? What is Express? It's a web framework that let's you structure a web application to handle multiple different http requests at a specific url. Express is a minimal, open source and flexible Node. js web app framework designed to make developing websites, web apps, & API's much easier. How do I install Express? Adding dependencies First create a directory for your new application and navigate into it: mkdir myapp cd myapp. Use the npm init command to create a package.json file for your application. ... Now install Express in the myapp directory and save it in the dependencies list of your pac What exactly is node JS? Node. js® is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node. js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.kage.json file. npm install express.