[Solved] Given this NestJS controller snippet, what happens when a request without a valid JWT token is sent? @UseGuards(AuthGuard('jwt')) @Get('profile') getProfile() { return { message: 'Access granted' }; } | NestJS

NestJS - Authentication

Given this NestJS controller snippet, what happens when a request without a valid JWT token is sent?

@UseGuards(AuthGuard('jwt'))
@Get('profile')
getProfile() {
  return { message: 'Access granted' };
}

AThe request is denied with a 401 Unauthorized error.

BThe request returns an empty response.

CThe request causes a server crash.

DThe request is allowed and returns { message: 'Access granted' }.

Step-by-Step Solution

Solution:

Step 1: Understand AuthGuard('jwt') behavior
This guard checks for a valid JWT token and blocks requests without it.
Step 2: Predict response for missing or invalid token
Without a valid token, the guard denies access and returns a 401 Unauthorized error.
Final Answer:
The request is denied with a 401 Unauthorized error. -> Option A
Quick Check:
Invalid token = 401 error [OK]

Quick Trick: No valid JWT means 401 Unauthorized response [OK]

Common Mistakes:

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Given this NestJS controller snippet, what happens when a request without a valid JWT token is sent?