About this tool
Token-based auth failures are hard to debug without readable claim inspection.
How to use
- Paste the JWT string from request headers.
- Inspect header algorithm and payload claims.
- Validate expiry, issuer, and audience against expected values.
FAQ
Can this verify signature validity?
Claim inspection is separate from cryptographic signature verification.
Why does exp look valid but auth fails?
Issuer, audience, and key rotation mismatches are also common causes.
Is local inspection safer?
Yes, local-only decoding reduces credential exposure risk.