[Solved] Why might a JWT strategy fail to authenticate a request in NestJS Passport integration? — Ans: The JWT token is missing or invalid in the request headers | NestJS

NestJS - Authentication

Why might a JWT strategy fail to authenticate a request in NestJS Passport integration?

AThe strategy class is not decorated with @Injectable()

BThe controller method lacks @Get() decorator

CThe JWT token is missing or invalid in the request headers

DThe AuthGuard is not imported from @nestjs/common

Step-by-Step Solution

Solution:

Step 1: Understand JWT strategy authentication
JWT strategy checks for a valid token in request headers.
Step 2: Identify common failure cause
If token is missing or invalid, authentication fails.
Final Answer:
The JWT token is missing or invalid in the request headers -> Option C
Quick Check:
JWT auth fails if token missing/invalid [OK]

Quick Trick: JWT strategy needs valid token in headers to authenticate [OK]

Common Mistakes:

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Why might a JWT strategy fail to authenticate a request in NestJS Passport integration?