jwt - decode a JWT's header and payload (no signature verification)

Usage:
  curl https://ttykit.com/jwt/<token>
  curl --data "$TOKEN" https://ttykit.com/jwt        (for very long tokens)

Examples:
  curl https://ttykit.com/jwt/eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0In0.dGVzdA