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How can you handle both expired and invalid JWT tokens gracefully in FastAPI?

hard🚀 Application Q9 of 15
FastAPI - Authentication and Security
How can you handle both expired and invalid JWT tokens gracefully in FastAPI?
AUse try-except to catch ExpiredSignatureError and InvalidTokenError, then raise HTTPException with 401
BReturn None for expired tokens and raise HTTPException for invalid tokens
CIgnore exceptions and return token string anyway
DOnly check token expiration manually without exceptions
Step-by-Step Solution
Solution:

  1. Step 1: Use try-except for JWT errors

    Catch both ExpiredSignatureError and InvalidTokenError exceptions.

  2. Step 2: Raise HTTPException with 401 status

    Raise HTTPException to inform client of unauthorized access.

  3. Final Answer:

    Catch exceptions and raise HTTPException with 401 -> Option A

  4. Quick Check:

    Handle JWT errors with exceptions and 401 response [OK]
Quick Trick: Catch JWT exceptions and raise 401 HTTPException [OK]
Common Mistakes:
MISTAKES
  • Returning None instead of raising exception
  • Ignoring exceptions and returning token
  • Manually checking expiration without exceptions

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