[Solved] What will happen if a JWT's signature does not match the header and payload during verification? — Ans: The token is considered invalid and rejected | Rest API

Rest API - Authentication and Authorization

What will happen if a JWT's signature does not match the header and payload during verification?

AThe payload is automatically refreshed

BThe token is accepted without verification

CThe token is considered invalid and rejected

DThe header is ignored but payload is accepted

Step-by-Step Solution

Solution:

Step 1: Understand JWT signature role
The signature ensures the token was not tampered with by verifying header and payload.
Step 2: Consequence of signature mismatch
If the signature does not match, the token is invalid and must be rejected for security.
Final Answer:
The token is considered invalid and rejected -> Option C
Quick Check:
Signature mismatch = Token rejected [OK]

Quick Trick: Invalid signature means reject token [OK]

Common Mistakes:

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What will happen if a JWT's signature does not match the header and payload during verification?