[Solved] Why are interceptors used to add cross-cutting logic in NestJS? — Ans: They allow code to run before and after method execution without changing... | NestJS

NestJS - Interceptors

Why are interceptors used to add cross-cutting logic in NestJS?

AThey allow code to run before and after method execution without changing business logic

BThey replace controllers to handle HTTP requests directly

CThey store data permanently in the database

DThey generate HTML views automatically

Step-by-Step Solution

Solution:

Step 1: Understand the role of interceptors
Interceptors run code before and after method calls, allowing extra logic without changing core business code.
Step 2: Identify what cross-cutting logic means
Cross-cutting logic is code that applies across many parts, like logging or timing, which interceptors handle well.
Final Answer:
They allow code to run before and after method execution without changing business logic -> Option A
Quick Check:
Cross-cutting logic = run code before/after method [OK]

Quick Trick: Interceptors wrap method calls to add extra logic easily [OK]

Common Mistakes:

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Why are interceptors used to add cross-cutting logic in NestJS?