JWT Decoder
Decode JWT header and payload without verification.
About JWT Decoder
Decode compact JWTs to read the header and payload claims while debugging OAuth, API gateways, or session issues. This decoder focuses on inspection — signature verification belongs in your backend.
How to use this tool
- Paste a compact JWT (header.payload.signature).
- Decode to view JSON header and payload.
- Check claims like sub, iss, aud, and exp.
- Use JWT Validator / Generator nearby when you need related workflows.
What you get
- Instant claim inspection
- Readable JSON output
- Ideal for auth debugging
Common use cases
- Debug failing API authorization
- Confirm expiry and subject claims
- Teach JWT structure to a team
Frequently asked questions
Does decoding verify the signature?
No. Decoding only reads Base64url segments. Use a validator/backend to verify signatures.
Is it safe to paste access tokens?
Avoid production secrets when possible. Prefer staging tokens for debugging.
Is the JWT decoder free?
Yes — free online JWT decoding on CodeForge Tools.