[Solved] What does a JWT authentication guard primarily do in a NestJS application? — Ans: It verifies the JWT token and allows access if valid | NestJS

NestJS - Guards

What does a JWT authentication guard primarily do in a NestJS application?

AIt verifies the JWT token and allows access if valid

BIt encrypts the JWT token before sending it

CIt generates a new JWT token for every request

DIt stores user sessions in memory

Step-by-Step Solution

Solution:

Step 1: Understand the role of a guard in NestJS
A guard controls access to routes by checking conditions before execution.
Step 2: Identify what JWT guard checks
The JWT guard checks if the JWT token is valid to allow or deny access.
Final Answer:
It verifies the JWT token and allows access if valid -> Option A
Quick Check:
JWT guard function = Verify token [OK]

Quick Trick: JWT guard checks token validity before route access [OK]

Common Mistakes:

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What does a JWT authentication guard primarily do in a NestJS application?