[Solved] Why does NestJS require careful ordering of middleware when applying multiple middleware functions? — Ans: Because middleware run sequentially and order affects request processing | NestJS

NestJS - Middleware

Why does NestJS require careful ordering of middleware when applying multiple middleware functions?

ABecause middleware run in parallel and order affects performance

BBecause middleware order determines which middleware is skipped

CBecause middleware run sequentially and order affects request processing

DBecause middleware order only matters for error handling middleware

Step-by-Step Solution

Solution:

Step 1: Understand middleware execution model
Middleware in NestJS run one after another, not in parallel.
Step 2: Recognize impact of order
The order controls how requests are processed and modified before reaching controllers.
Final Answer:
Because middleware run sequentially and order affects request processing -> Option C
Quick Check:
Middleware order matters due to sequential execution [OK]

Quick Trick: Middleware order matters because they run one after another [OK]

Common Mistakes:

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