Check keys

main.dart

final json = [
  {
    "name": "to",
    "type": "address",
  },
  {
    "name": "tokenId",
    "type": "uint256",
  },
];

void main() {
  final toCheck = {
    "to": "1",
    "tokenId": 1,
  };
  
  final keysNotInToCheck = json.map((v) => v["name"]).where((k) => !toCheck.keys.contains(k)).toList();
  if (keysNotInToCheck.isNotEmpty) {
    print('Keys missing in toCheck: ${keysNotInToCheck.join(', ')}');
  }
  else {
    print('All good!');
  }
}