🔑

JWT Decoder & Inspector

Decode JSON Web Tokens (JWT) client-side. Inspect headers, payload, claims, and expiration status instantly.

Encoded JWT Token

HEADER: ALGORITHM & TOKEN TYPE

{
  "alg": "HS256",
  "typ": "JWT"
}

PAYLOAD: DATA & CLAIMS

✅ TOKEN ACTIVE (Expires): Tue, 19 Jan 2038 03:14:07 GMT

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022,
  "exp": 2147483647
}

What is a JSON Web Token (JWT)?

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. JWTs consist of three parts separated by dots: Header, Payload, and Signature.

Is my token private when using this tool?

Yes! All decoding is executed completely client-side in your web browser. Your JWT token and secret credentials are never transmitted to any external server or saved in any database.

Frequently Asked Questions

How do I know if a JWT is expired?Look at the exp claim in the decoded payload. If the Unix timestamp is in the past, the token is expired.

Can this tool verify the signature?Signature verification requires knowing your secret key or public key. This tool inspects the claims and dates without needing your private server key.