Express.js is a web application framework for Node.js that simplifies its APIs and adds helpful new features. It is designed for building web applications and APIs and has been called the de facto standard server framework for Node.js. Express.js provides a thin layer of fundamental web application features, without obscuring Node.js features that you know and love. It makes it easier to organize your application’s functionality with middleware and routing, and adds helpful utilities to Node.js HTTP objects and facilitates the rendering of dynamic HTTP objects.
Express.js is used to build a single page, multipage, and hybrid web application. It is fast to link it with databases like MySQL, MongoDB, etc. and allows dynamic content on the web pages by creating HTML templates on the server. Express.js is un-opinionated, meaning that it allows developers the freedom to structure their code how they choose instead of forcing a particular code structure. One place where this un-opinionated stance can be seen is with the application of middleware. Middleware allows for operations to be performed on requests and responses before they are passed to the next middleware function in the stack.
Express.js is easy to set up and personalize, and allows you to define application routes using HTTP methods and URLs. It includes a number of middleware modules that can be used to execute additional requests and responses activities. Express.js provides templating engines to build dynamic content on the web pages by creating HTML templates on the server. It also allows you to specify a middleware for handling errors.
To install Express.js, you can use npm. Make sure that you have Node.js and npm installed, create a directory for your project, and make that your working directory.
