What is a JSON Web Token (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.
Why use a Client-Side Decoder?
JWTs often contain sensitive user data (like User IDs, Emails, or Roles) and are used for authentication. Pasting these tokens into random websites is a security risk because a malicious server could log your token and hijack your session.
FreeSoft.app solves this by running the decoding logic entirely in your browser using JavaScript. Your token never leaves your device.
JWT Structure
- Header: Consists of the token type (JWT) and the signing algorithm (e.g., HMAC SHA256).
- Payload: Contains the claims (statements about an entity and additional data).
- Signature: Used to verify the message wasn't changed along the way.
Last Updated: