Security
Security Lead
Debugging JWTs: A Security Protocol for Developers
Learn how to safely decode and inspect JSON Web Tokens without compromising sensitive production data.
The Developer's Guide to JWT Debugging
JSON Web Tokens (JWT) are the backbone of modern auth. But when a "401 Unauthorized" hits, you need to know why.
Common JWT Errors
- Token Expired: Check the
expclaim. - Invalid Algorithm: Ensure you're not using
none. - Claim Mismatch: Verify the audience (
aud) and issuer (iss).
Why Local Debugging is Mandatory
Never paste a production token into a tool that sends data to a server. Our JWT Debugger decodes locally in your browser, keeping your secrets safe from logs.
How-To Check Expiration:
Simply paste your token. If the exp claim is within 24 hours, our tool will highlight it in amber. If it's already past, it turns red.