JWT Debugger

Decode and inspect JSON Web Tokens (JWT) instantly.

Encoded Token

Decoded

HEADER: Algorithm & Token Type
// Header will appear here
PAYLOAD: Data
// Payload will appear here

What is this Tool?

JWT Debugger is a developer tool that decodes JSON Web Tokens (JWT) to verify internal information. It allows for easy analysis of Header, Payload, and Signature structures.

How to use

  1. Paste the JWT string you want to analyze into the 'Encoded Token' input field.
  2. Check the automatically decoded Header and Payload information on the right screen.
  3. If the token is invalid or malformed, an error message will be displayed.

Why do you need it?

  • Development Efficiency: Instantly verify if the information (expiration time, permissions, etc.) contained in the token is correct when implementing login authentication.
  • Security Check: Visually confirm that the token does not contain sensitive personal information in unencrypted form.

FAQ

Q. Does it verify the Signature?

Currently, this tool focuses on decoding and displaying the token's content. Signature validation functionality is planned for a future update.