JWT Payload Viewer
View the JWT payload and its claims such as iss, aud and sub. Paste a token to inspect who issued it, who it is for and what scopes it carries.
Part of the free JWT Decoder. Runs in your browser — nothing is uploaded.
JWT Payload Viewer
The payload carries the claims: who the token is about (sub), who issued it (iss), who it is meant for (aud) and any custom data. Paste a token to inspect each claim when debugging an authorization failure.
Worked example: Issuer, audience and subject claims
JWT
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwczovL2F1dGguZXhhbXBsZS5jb20iLCJhdWQiOiJhcGkuZXhhbXBsZS5jb20iLCJzdWIiOiJ1c2VyXzlmMiIsInNjb3BlIjoicmVhZCB3cml0ZSIsImlhdCI6MTc2NzIyNTYwMCwiZXhwIjoxNzY3MjI5MjAwfQ.c2lnbmF0dXJl
Decoded payload
// HEADER
{
"alg": "HS256",
"typ": "JWT"
}
// PAYLOAD
{
"iss": "https://auth.example.com",
"aud": "api.example.com",
"sub": "user_9f2",
"scope": "read write",
"iat": 1767225600,
"exp": 1767229200
}
// CLAIM TIMES (UTC)
iat: 2026-01-01 00:00:00 UTC
exp: 2026-01-01 01:00:00 UTCPractical tip
A 401 with a seemingly valid token is often an aud or iss mismatch. Compare these two claims against your API configuration first.
How to use this JWT Decoder
- 1Use the live tool above — it runs entirely in your browser and never uploads your data.
- 2Paste the sample from the worked example, or use your own input.
- 3Copy the result, then adapt the same steps in your editor, script, or pipeline.
JWT Payload Viewer FAQs
What is the difference between iss, sub and aud?
iss is the issuer that created the token, sub is the subject it describes (usually a user ID), and aud is the audience it is intended for.
Can I add custom claims?
Yes. Any extra key in the payload is a custom claim, for example roles or tenant_id. Keep them small, because the token is sent with every request.
More JWT Decoder pages
- Decode a JWT Token OnlineDecode a JWT token online to read its header and payload claims. Paste the token and see readable JSON instantly. Runs in your browser, nothing is uploaded.
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- Decode a JWT Without the SecretYou can decode a JWT without the secret because the header and payload are only Base64URL encoded. Paste a token to read it. Verification needs the key.
- Decode an Auth0 JWTDecode Auth0 ID tokens and access tokens to inspect claims like iss, aud, scope and custom namespaced claims. Free, local and private.
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- JWT Header and Algorithm CheckerCheck a JWT header for the alg, typ and kid fields. Find out whether a token is signed with HS256 or RS256 and which key ID to verify with.
- JWT Claims Explained With a Live DecoderLearn what every registered JWT claim means: iss, sub, aud, exp, nbf, iat and jti. Paste a token to see each claim decoded.
- JWT nbf (Not Before) Claim CheckerCheck the JWT nbf claim. See the "not before" time as a readable UTC date and find out why a fresh token is rejected as not yet valid.