[Solved] Why does middleware in NestJS process requests before the route handlers? — Ans: To prepare or check the request before the handler uses it | NestJS

NestJS - Middleware

Why does middleware in NestJS process requests before the route handlers?

ATo delay the request processing intentionally

BTo send the response after the handler finishes

CTo replace the route handler completely

DTo prepare or check the request before the handler uses it

Step-by-Step Solution

Solution:

Step 1: Understand middleware role
Middleware runs before handlers to prepare or validate requests, like checking authentication or adding data.
Step 2: Compare with other options
Middleware does not send responses after handlers or replace handlers; it only processes requests early.
Final Answer:
To prepare or check the request before the handler uses it -> Option D
Quick Check:
Middleware prepares requests = D [OK]

Quick Trick: Middleware runs first to prep requests before handlers [OK]

Common Mistakes:

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Why does middleware in NestJS process requests before the route handlers?