Cursor auth

JWT Signature Invalid After Cursor Code Generation

JWT tokens generated before Cursor's refactoring are now rejected with signature verification errors. The application validates incoming JWTs but now fails on all tokens, including valid ones.

This typically occurs when the JWT secret key configuration changes or the verification algorithm is modified during code generation.

Error Messages You Might See

JsonWebTokenError: invalid signature TokenExpiredError: jwt expired invalid token ERR_JWT_CLAIM_VALIDATION_FAILED
JsonWebTokenError: invalid signatureTokenExpiredError: jwt expiredinvalid tokenERR_JWT_CLAIM_VALIDATION_FAILED

Common Causes

  1. JWT secret key was moved or regenerated during code organization
  2. Algorithm changed (HS256 vs RS256) without updating verification logic
  3. Secret key not trimmed, whitespace causing mismatch
  4. Buffer encoding changed (utf8 vs base64)
  5. Clock skew tolerance removed from token verification

How to Fix It

Verify JWT_SECRET environment variable is identical across before/after. Check algorithm consistency in sign() and verify() calls. Ensure no string trimming/encoding changes. Add clock skew tolerance: { clockTimestamp: Math.floor(Date.now() / 1000), clockTolerance: 10 }

Real developers can help you.

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Frequently Asked Questions

Can I rotate JWT secrets?

Yes, but implement gradual rotation with a key version. Accept both old and new keys during transition period.

Why is my HS256 token failing?

Ensure secret is a string, not an object. Use crypto.createHmac('sha256', secret) or jwt.verify with matching algorithm.

Related Cursor Issues

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