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JWT Validation Fails in Cascade-Generated Auth
API requests with JWT tokens are being rejected with signature validation errors or token validation failures, even though tokens appear valid. Cascade likely modified JWT signing key management or validation logic during refactoring.
This breaks API authentication and causes 401/403 responses for previously working endpoints.
Error Messages You Might See
JWT signature does not match locally computed signature
Token has expired
Invalid token signature
java.security.SignatureException
Common Causes
- Cascade changed JWT signing key without updating validation keys
- Algorithm mismatch: Cascade generated with HS256 but validating as RS256
- Token expiration time changed by Cascade causing immediate expiration
- Cascade regenerated key pairs without coordinating with token generation
How to Fix It
Verify jwt.secret matches between token generation and validation. Check JwtTokenProvider bean for algorithm consistency. Ensure token expiration is set to reasonable value. If using RSA keys, confirm public key used for validation matches private key that signed tokens.
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Omar Faruk
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Franck Plazanet
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Iām a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
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Get HelpFrequently Asked Questions
How do I debug JWT issues?
Decode JWT at jwt.io to verify claims. Check token generation vs validation secret keys match exactly.
Can I rotate JWT keys?
Yes, but require clients to re-authenticate with new key. Coordinate rollout to avoid disruption.