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JWT Decoder
Decode JWT header and payload safely in your browser. Inspect claims and structure without sending tokens anywhere.
How to use this tool
- Paste a JWT into the input field.
- Review the decoded header and payload JSON.
- Copy any section or reset the form when finished.
Debug scenarios
- Inspect claims when troubleshooting authentication issues.
- Verify audience, issuer, and expiration fields before deploying changes.
- Teach teammates how JWTs are structured without exposing secrets.
Security reminders
- Decoding does not prove the token is trustworthy. Always verify signatures server-side.
- Never paste tokens from production environments into untrusted tools.
- Use short-lived tokens and rotate secrets regularly to minimize exposure.
FAQ
- Why is the signature unreadable?
- Signatures are binary data represented as base64url strings and are not JSON.
- Can I verify the signature here?
- No. This tool only decodes. Use server-side libraries or a validator for signature verification.
- Is decoding offline?
- Yes. All parsing happens locally in your browser and tokens are not transmitted.
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