← Back to Tools

JWT Decoder

Decode and inspect JSON Web Tokens

JWT Token

About JWT

  • Structure: Header.Payload.Signature
  • Encoding: Base64Url encoded JSON
  • Header: Contains algorithm and token type
  • Payload: Contains claims (user data)
  • Signature: Ensures token integrity
  • Security: Never share tokens publicly

Standard Claims

  • iss: Issuer of the token
  • sub: Subject (user ID)
  • aud: Intended audience
  • exp: Expiration time
  • nbf: Not valid before
  • iat: Issued at time
  • jti: Unique token ID