Lesson 02 · 11 min
Middleware
A pipeline of functions before the handler: logging, auth, body parsing.
11 minLesson 2 of 9Practice includedAsk AI on any point
Middleware is a function (req, res, next). It can check something or add to req, then pass control on with next(). Or it can respond itself and stop the chain. The order of app.use matters: they run top to bottom.
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