Express Middleware in Node.js

Express middleware is code written that executes during a request/response cycle in Node.js. It's commonly used to add functionality, or to provide features to Express like user authentication or caching to your application. Express itself is essentially a collection of "middlewares". Understanding how middleware works, how to use them, and how to create your own is an important part of working with Express.

By the end of this tutorial, you should be able to:

  • Understand how Node.js Express middleware works
  • Understand the purpose of Express middleware
  • Know how to add middleware to your server
  • Create your own middleware to add custom functionality to Express
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