Express

Express is a basic framework for building web applications and APIs with a Node server. It provides a simple layer of fundamental web application features that complements Node.

In any web application developed with Node, Express can be used as a routing and middleware web framework that has minimal functionality of its own—an Express application is essentially a series of middleware function calls.

Middleware functions are functions that have access to the HTTP request and response objects, and also the next middleware function in the web application's request-response cycle.

It is possible to insert almost any compatible middleware of your choice into the request handling chain, in almost any order, making Express very flexible to work with.

Find out what is possible with Express.js at expressjs.com.