[Solved] Consider the following NestJS controller method guarded by JwtAuthGuard:@UseGuards(JwtAuthGuard) @Get('profile')... }What will happen if a request is made without an Authorization header? | NestJS

NestJS - Guards

Consider the following NestJS controller method guarded by JwtAuthGuard:

@UseGuards(JwtAuthGuard)
@Get('profile')
getProfile() {
  return { profile: 'user data' };
}

What will happen if a request is made without an Authorization header?

AThe request will throw a server error (500).

BThe request will succeed and return the profile data.

CThe request will be redirected to the login page.

DThe request will be denied with a 401 Unauthorized error.

Step-by-Step Solution

Solution:

Step 1: Understand JwtAuthGuard behavior
JwtAuthGuard checks for a valid JWT token in the Authorization header.
Step 2: Missing Authorization header
If the header is missing, the guard will reject the request and respond with 401 Unauthorized.
Final Answer:
The request will be denied with a 401 Unauthorized error. -> Option D
Quick Check:
Missing token means no authentication [OK]

Quick Trick: No token means 401 Unauthorized response [OK]

Common Mistakes:

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