What is Express?

Express 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 the rapid development of Node based Web applications. 

•  Features of Express framework
  • Allows to set up middlewares to respond to HTTP Requests.
  • Defines a routing table which is used to perform different actions based on HTTP Method and URL.
  • Allows to dynamically render HTML Pages based on passing arguments to templates.

•  How to install Express in ubuntu
  • $ npm install express --save

• body-parser
  • This is a node.js middleware for handling JSON, Raw, Text and URL encoded form data.
  • $ npm install body-parser –save
• cookie-parser
  •  Parse Cookie header and populate req.cookies with an object keyed by the cookie names.
  • $ npm install cookie-parser –save
• multer
  • This is a node.js middleware for handling multipart/form-data.
  • $ npm install multer --save

Reference: https://www.tutorialspoint.com/expressjs/ 

           https://blog.vanila.io/setup-basic-server-with-express-framework-37b