Express.js is a free and open source software and web application framework for Node JS which was designed for the development of web applications and API’s. It is also the standard server framework for Node JS. It was developed by TJ Holowaychuk on 16th November 2010. Along with the MongoDB database and Angular JS frontend framework, express JS is the backend part of the MEAN stack. With the help of this, you will be able to manage everything from routes to handling requests and views. It even provides a robust set of features for various web and mobile applications.
This way, an express JS application is set up.
The third argument is optional and may be omitted, but in some cases, it is useful where there is a chain of handlers and control can be passed to one of the subsequent route handlers skipping the current one.
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