JWT Decoder
Decode and inspect JSON Web Tokens to view their header, payload, and claims.
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. JWTs are commonly used for authentication and information exchange in web applications.
JWT Structure
A JWT consists of three parts separated by dots:
- Header - Contains the token type and signing algorithm
- Payload - Contains the claims (user data and metadata)
- Signature - Used to verify the token hasn't been tampered with
Common Claims
- iss - Issuer of the token
- sub - Subject (usually user ID)
- exp - Expiration time
- iat - Issued at time
- aud - Audience