JWT Debugger
Decode and analyze your JSON Web Tokens.
Decoded token information will appear here
About the JWT Debugger
A JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. Our JWT Debugger is a secure, client-side tool that allows you to decode and inspect the contents of a JWT. You can paste a token to view its header, payload, and signature without any data ever leaving your browser. This is essential for developers who are debugging authentication flows or verifying the contents of a token.
How to Use This Tool
- Paste Token: Copy your JWT and paste it into the main text area.
- Instant Decoding: The tool will immediately parse the token and display its three parts:
- Header: Contains the token type (JWT) and the signing algorithm used.
- Payload: Contains the claims, such as user ID, roles, and expiration times.
- Signature: Used to verify that the sender of the JWT is who it says it is and to ensure that the message wasn't changed along the way.
- Inspect Data: Review the decoded header and payload data in the formatted cards. The signature is displayed as-is.