JWT Decoder
Decode and inspect JSON Web Tokens
JWT Decoder
How to use this tool:
- Paste your JWT token into the field above
- Click the "Decode Token" button to analyze the token
- View the decoded information in the tabs below
- Use the "Copy" buttons to copy specific parts of the token
This tool operates entirely in your browser - no data is sent to any server, ensuring your token remains private and secure.
About JSON Web Tokens (JWT)
JWT is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs consist of three parts: Header (algorithm & token type), Payload (data), and Signature (verification).
JWT Structure: header.payload.signature
Header: Contains the type of token (JWT) and the signing algorithm (e.g., HMAC SHA256 or RSA).
Payload: Contains claims (statements about an entity and data). Common claims include:iss (Issuer),sub (Subject),exp (Expiration Time),iat (Issued At).
Signature: Created by signing the encoded header and payload using a secret key. It verifies that the message wasn't changed and, in some cases, verifies the sender's identity.