Middleware — Roadmap Step & Resources
Understanding the middleware chain, built-in, third-party and custom middleware
- Level: intermediate
- Estimated time: 1 days
- Roadmap: MERN Stack
Before this step
Interview questions
- What does calling next() do in Express middleware?
Study resources
- Using middleware (Article) — Express's official documentation explaining the middleware chain with runnable examples.
- Express Middleware Explained (Video) — A clear, practical explanation of what middleware does and how to write custom middleware.
- Writing middleware for use in Express apps (Article) — Official Express guide explaining req, res, next, middleware execution order, and custom middleware design.
Part of
- Express.js — section
- MERN Stack roadmap — the full learning path