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middleware order
also middleware pipeline
The first middleware sees the request first. Auth at the bottom of the stack is auth that never runs in time.
What is middleware order?
Middleware is a stack. The first one registered usually sees the request before the handler and the response on the way out, if it wraps the call to next. Auth belongs before the handler. The body parser belongs before code that reads the body. An error handler has to be in the position that actually catches. A CORS preflight must not require a logged-in user.
Why does middleware order matter when vibe coding?
The draft copies a stack from a starter and appends auth at the end. Routes above it are public. Or the error middleware is registered last in a framework where last means it never wraps the others.
How do you do middleware order?
Write the order down: ids, logs, auth, body, handler, errors. Test that an unauthenticated request never reaches the handler. Test that a thrown error hits the error handler.
How do you ask a model for middleware order?
Order middleware for (app): request id, logging, CORS, auth, body parser, routes, error handler. Unauthenticated requests must not reach (handler). A CORS preflight must not require auth. A thrown error must hit the error handler.
What goes wrong with middleware order?
Auth middleware that calls next() after sending 401. The handler runs anyway and may commit.