JWT Claim Explainer
Decode a JWT and explain registered claims locally in your browser.
JWT claim explainer workspace
Explain registered JWT claims locally. Signature trust is not verified.
JWT input
Signature not verified
This decoder reads JWT header and payload locally. It does not verify signatures or trust claims.
Output
JWT decoded live
Header and payload are decoded locally. Signature trust is not verified.
Claim explainer
issIssuer- https://issuer.example
- Issuer that created the token.
subSubject- user_123
- Subject the token is about.
audAudience- api
- Audience expected to receive the token.
expExpiresActive- 2027-01-01T00:00:00.000Z
- Expiration time after which the token should not be accepted.
nbfNot beforeValid now- 2026-01-01T00:00:00.000Z
- Not-before time before which the token should not be accepted.
iatIssued at- 2025-12-31T00:00:00.000Z
- Issued-at time when the token was created.
jtiJWT ID- token-1
- Unique token identifier.
Header
Payload
Signature
Questions
Does JWT Claim Explainer verify signatures?
No. It explains decoded claims locally, but it does not verify signatures or trust the token.
Which JWT claims are explained?
It explains common registered claims including iss, sub, aud, exp, nbf, iat, and jti.
Does Utilumo upload my input?
No. Utilumo has no backend that could receive your input. Where a tool makes a request as part of its function, it goes directly from your browser to the destination you choose, never through Utilumo.
Do I need an account?
No. Utilumo tools are built to work without accounts or sign-in.