How to Use the JWT Debugger & Token Claims Inspector
-
1
Paste your encoded JSON Web Token (e.g. eyJhbGciOi...) into the input box.
-
2
The token splits into Header (red), Payload (purple), and Signature (blue).
-
3
Inspect decoded claims: `sub`, `name`, `roles`, `iss`, `aud`.
-
4
View human-readable Expiration Status (e.g. "Expired 2 hours ago" or "Valid until 2028").
Practical Example & Use Case
Common Real-World Scenario
Debugging auth tokens from OAuth2, Cognito, or Auth0 during local app development without pasting credentials into remote debuggers.
Technical Notes & Limitations
Browser Engine Architecture
Decodes Base64URL payloads purely in client memory without transmitting token data to any server.
Frequently Asked Questions
Is it safe to paste production JWTs here?
Yes! Unlike popular online JWT sites that send tokens to remote servers, WebUtilities executes 100% locally in your browser memory.