JWT Decoder/Encoder

Encode or decode JSON Web Tokens (JWT) with a custom secret. Paste your token or payload, enter your secret, and get instant results.

About JWT

JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. Commonly used for authentication and information exchange.

  • Consists of header, payload, and signature
  • Can be signed with a secret or private key
  • Used in OAuth, OpenID, and many web APIs

Security Notice

Never share your secret key or sensitive JWTs publicly. Always validate tokens on the server side.

This tool does not store or transmit your data.