Developer Utility
JWT Sign / Verify (HMAC) Tool
Sign and verify JWTs with HMAC algorithms for local testing workflows.
Language: JWTUtility: GenerateUtility: ValidateUtility: Inspect
Use Sign JWT or Verify JWT.
What This Tool Does
Sign and verify JWTs with HMAC in-browser for local development and auth testing.
Use it to inspect or transform input quickly, then carry validated output into code, tests, or API requests.
Common Use Cases
- Generate HS256 test tokens with controlled claims.
- Verify incoming HMAC JWTs during debugging.
- Prototype token flows without external signing services.
Common Pitfalls
- HMAC test signing is not a replacement for production key management.
- Token validity still depends on claim semantics like exp/nbf.
FAQ
Does this support HS256/HS384/HS512?
Yes, common HMAC JWT algorithms are supported.
Can I use this for RS256 certificates?
This tool focuses on HMAC workflows in MVP scope.
Does this tool send data to a backend?
Most tools process input client-side in your browser unless explicitly noted.