What is ExpressJs?

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In short Express is a Fast, unopinionated, minimalist web framework for Node.js

ExpressJs is a minimal and flexible Node.js web application framework that provides a robust set of features to develop web and mobile applications. It facilitates a rapid development of Node based Web applications. Express provides a thin layer of fundamental web application features, without obscuring Node.js features that you know and love. The app starts a server and listens on port 3000 for connections. The app responds with “Hello World!” for requests to the root URL (/) or route. For every other path, it will respond with a 404 Not Found.

How to install Express JS and use it ?