JWT Decoder
Read the JSON inside a token, interpret standard time claims and keep the unverified signature clearly separated from trust.
Paste a JWT or load the safe sample to inspect its contents.
Your JWT is processed locally in your browser and is not uploaded.
How to use JWT Decoder
- 1
Paste a three-segment JWT or load the safe sample token.
- 2
Confirm the structural status and remember that decoding does not verify authenticity.
- 3
Inspect and copy the formatted Header or Payload JSON.
- 4
Review common claims, readable UTC times and the limited Active, Expired or Not yet valid status.
- 5
View or copy the raw Signature segment, or click Clear to remove all token data.
Frequently asked questions
About JWT Decoder
A JWT is readable by design; its encoded header and payload are not confidential. This decoder strictly processes Base64URL, UTF-8 and JSON so malformed segments are distinguished from valid data. Familiar claims are organized with their raw value intact, and NumericDate fields gain human-readable UTC context.
Time-window labels interpret only exp and nbf against the current clock. They cannot establish who issued the token or whether its signature is genuine. The signature remains visible yet explicitly unverified, and the tool never retrieves a JWKS, contacts an identity provider or sends the token outside the browser.