JWT Decoder
Decode JSON Web Tokens (JWT) to view header and payload. Client-side only, no data is sent to any server.
JWT Token
About JWT
JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object.
Structure: A JWT consists of three parts separated by dots:
- Header: Contains metadata about the token (algorithm, type)
- Payload: Contains the claims (user data, permissions, etc.)
- Signature: Ensures the token hasn't been tampered with
Privacy: All decoding happens in your browser. No data is sent to any server.