[Solved] Given the following code snippet, what will be the output if the token is expired?try { const payload = jwtService.verify(token); return 'Valid Token'; } catch (e) { return 'Invalid Token'; } | NestJS

NestJS - Authentication

Given the following code snippet, what will be the output if the token is expired?

try {
  const payload = jwtService.verify(token);
  return 'Valid Token';
} catch (e) {
  return 'Invalid Token';
}

AInvalid Token

BValid Token

CToken Expired Error

DUndefined

Step-by-Step Solution

Solution:

Step 1: Understand jwtService.verify behavior on expired token
When a token is expired, verify throws an error caught by catch block.
Step 2: Analyze catch block return value
The catch block returns 'Invalid Token' on any verification error including expiration.
Final Answer:
Invalid Token -> Option A
Quick Check:
Expired token triggers catch = 'Invalid Token' [OK]

Quick Trick: Expired tokens cause verify() to throw, caught as invalid [OK]

Common Mistakes:

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