JWT Decoder

Decode JWT header and payload instantly. No signature verification.

JWT Token

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "dev-user",
  "role": "developer",
  "iat": 1700000000,
  "exp": 1700003600
}

This tool only decodes base64url data. It does not validate the signature or token claims.