How do custom decorators in NestJS typically store metadata that can be later retrieved by the Reflector?

easy📝 Conceptual Q2 of 15

NestJS - Guards

How do custom decorators in NestJS typically store metadata that can be later retrieved by the Reflector?

ABy registering metadata in a global variable accessible to all modules.

BBy modifying the method's source code directly.

CBy using <code>SetMetadata</code> to attach key-value pairs to the target method or class.

DBy using environment variables to store metadata values.

Step-by-Step Solution

Solution:

Step 1: Recall how metadata is set
Custom decorators use SetMetadata to attach metadata key-value pairs.
Step 2: Evaluate options
Only By using SetMetadata to attach key-value pairs to the target method or class. correctly describes this standard approach; others are incorrect or impractical.
Final Answer:
By using SetMetadata to attach key-value pairs to the target method or class. -> Option C
Quick Check:
SetMetadata is the official way to store metadata in NestJS. [OK]

Quick Trick: SetMetadata attaches metadata key-value pairs [OK]

Common Mistakes:

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