JWT Token Decoder
Decode and validate JSON Web Tokens (JWT) instantly. View header, payload, claims, and expiration. All processing in your browser—100% private.
100% Private
All decoding happens in your browser. Tokens never touch our servers.
Full JWT Support
Decodes header, payload, claims (sub, iss, aud, exp, iat), and signature.
Always Free
Professional JWT decoder, completely free. No limits, no sign-up required.
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About JSON Web Tokens (JWT)
What is a JWT?
JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange in web applications.
JWT Structure
A JWT consists of three parts separated by dots (.): Header.Payload.Signature. The header contains the algorithm, the payload contains claims (user data), and the signature verifies authenticity.
Common Claims
- sub: Subject (user ID)
- iss: Issuer (who created the token)
- aud: Audience (who the token is for)
- exp: Expiration time
- iat: Issued at time
Security Note
This tool only decodes JWTs—it does not verify signatures. Signature verification requires the secret key used to sign the token. Never share JWT secrets publicly, and always use HTTPS in production.