I. What is Express.js?

Express.js is a server-side or back-end web framework based on the core Node.js http module and Connect components.

Express helps us easily manage our routing, requests, server-side logic and responses. It also makes our code easier to read, update and extend.

II. Why using Express?

  • Deliver static content
  • Construct an API
  • Connect to various data sources (with additional plugins)
  • Support MVC (Model-View-Controller)
  • Make building web apps with Node.js much easier

III. What to know before starting

  • JavaScript fundamentals
  • Arrow functions
  • High-order array methods (forEach, map, filter)
  • Node.js & NPM
  • HTTP status codes
  • JSON