ScaleWhite Tools

JWT Decoder

Decode and inspect JSON Web Token (JWT) contents.

What is this tool?

This tool decodes JSON Web Tokens (JWT) and displays the header, payload, and signature. It also checks whether the token has expired. No data is sent to a server — all decoding is done locally.

How to Use

  1. Paste a JWT token in the input field.
  2. Click 'Decode' to parse the token.
  3. View the header, payload, and signature sections.
  4. The expiration status is shown if the token contains an 'exp' claim.

Examples

  • Inspect the claims in an OAuth access token.
  • Check if a JWT token has expired.
  • View the algorithm and key ID in a token's header.