TOPIC OVERVIEW

NestJS/Middleware

Run logic before your request reaches the rest of the NestJS pipeline.

12 QuestionsIntermediateHigh Priority ~8 min read

Middleware runs during the request-response process before the request reaches the route handler. It can inspect or modify the request and response objects, or perform tasks such as logging and request preprocessing.

Middleware is useful for concerns that apply broadly to incoming requests, but it is not always the right place for authentication, authorization, validation, or response transformation. NestJS provides guards, pipes, and interceptors for those more specific responsibilities.

What you'll walk away knowing

How middleware works in NestJS

How middleware is registered and applied

Common middleware use cases such as logging

How middleware differs from guards and interceptors

1What can middleware NOT do that guards or interceptors can in NestJS?ExpertHigh 2What is middleware in NestJS and how does it differ from Express middleware?ExpertHigh 3How do you apply middleware to specific routes or exclude certain routes in NestJS?ExpertHigh

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