[Solved] Identify the error in this JwtStrategy constructor code snippet: constructor(private readonly jwtService: JwtService) { super({ jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(), secretOrKey:... | NestJS

NestJS - Authentication

Identify the error in this JwtStrategy constructor code snippet:

constructor(private readonly jwtService: JwtService) {
  super({
    jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
    secretOrKey: process.env.JWT_SECRET,
  });
}

AMissing call to super() with options object

Bprocess.env.JWT_SECRET might be undefined causing runtime error

CjwtFromRequest should be a function, not a method call

DJwtService should not be injected in JwtStrategy constructor

Step-by-Step Solution

Solution:

Step 1: Review constructor usage
The constructor correctly calls super() with options including jwtFromRequest and secretOrKey.
Step 2: Check environment variable usage
If process.env.JWT_SECRET is undefined, the strategy will fail at runtime because the secret key is missing.
Final Answer:
process.env.JWT_SECRET might be undefined causing runtime error -> Option B
Quick Check:
Missing JWT secret causes runtime failure [OK]

Quick Trick: Always ensure JWT_SECRET env variable is set before running [OK]

Common Mistakes:

Assuming jwtFromRequest is incorrectly used
Thinking JwtService injection is invalid here
Ignoring possibility of missing environment variables

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More NestJS Quizzes

Identify the error in this JwtStrategy constructor code snippet:

Step 1: Review constructor usage

Step 2: Check environment variable usage

Final Answer:

Quick Check:

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