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DevUtil

JWT Decoder

JWT Decoder

Decode and inspect JSON Web Tokens (JWT). View header, payload, and signature information.

This tool only decodes tokens. It does not verify signatures.

JWT Token

0 characters

About JWT Tokens

What is JWT?

JSON Web Token (JWT) is an open standard for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange.

JWT Structure

  • Header: Algorithm and token type
  • Payload: Claims and data
  • Signature: Verification signature

Common Claims

  • iss - Issuer of the token
  • sub - Subject (user ID)
  • aud - Audience
  • exp - Expiration time
  • nbf - Not before time
  • iat - Issued at time
  • jti - JWT ID

Security Note: This tool only decodes tokens. Always verify signatures on the server side.