JWT Decoder
Decode and inspect JSON Web Tokens. No data is sent to our servers - all decoding happens in your browser.
About JWT Decoding
What is a 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. This information can be verified and trusted because it is digitally signed.
JWT Structure
- Header - Contains the type of token and the signing algorithm
- Payload - Contains the claims (user data and metadata)
- Signature - Verifies the token hasn't been altered
Common Use Cases
- Authentication and authorization systems
- Secure information exchange between parties
- Single Sign-On (SSO) implementations
- API authentication
- Stateless session management
- Access token validation
JWTs are commonly used in web applications, microservices, and mobile apps for securely transmitting information that can be verified and trusted.