Answer
Middleware runs in the order defined. Logging, authentication, and parsers must be placed correctly to ensure proper request handling.
Quick Answer
Express applies middleware in the exact order you call app.use(). If you define a route before the authentication middleware, unauthenticated requests reach that route. Body parser must run before routes that read req.body. Logger should be first. Error handler must be last. Order determines behavior — get it wrong and things break silently.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ