Express Middleware Explained: The next() Trick Every Node.js Dev Needs | Node.js Course #8

Express Middleware Explained (Custom & Built-in) – Lecture 8 of the Node.js & Express Full Course, a free Node.js and Express.js tutorial for beginners. Learn Express middleware, custom middleware, app.use Express with hands-on code examples for backend JavaScript development. Lecture 8 explains Express middleware: the req, res, next pipeline, application vs router-level middleware, writing custom logger, timing, and API-key middleware, middleware factories, and popular third-party middleware like morgan and cors. What you'll learn • What middleware is and how next() works • Order of middleware and short-circuiting • Writing custom logger and auth middleware • Route-level and router-level middleware • Middleware factories and third-party packages Chapters 00:00 Intro 00:51 The middleware pipeline 02:13 Custom logger and timer 03:35 Order, short-circuit and route-level 05:11 Middleware factories 06:22 Third-party middleware 07:00 Recap 07:39 Next: error handling Altered or synthetic content: The presenter visuals and narration in this video are AI-generated/AI-assisted from the instructor's own photo and an original teaching script. All code, diagrams and teaching content are original. #NodeJS #ExpressJS #ExpressMiddleware