function validateCNPJ(cnpjNumber) {
  var cnpj, length, numbers, digit, sum, pos, result;

  cnpj = cnpjNumber.replace(/\D/g, '');
  if (cnpj.length !== 14 || /^(\d)\1+$/g.test(cnpj)) {
      return false;
  }

  length = cnpj.length - 2;
  numbers = cnpj.substring(0, length);
  digit = cnpj.substring(length);
  sum = 0;
  pos = length - 7;
  for (i = length; i >= 1; i--) {
      sum += parseInt(numbers.charAt(length - i)) * pos--;
      if (pos < 2) {
          pos = 9;
      }
  }

  result = sum % 11 < 2 ? 0 : 11 - sum % 11;
  if (result !== parseInt(digit.charAt(0))) {
      return false;
  }

  length = length + 1;
  numbers = cnpj.substring(0, length);
  sum = 0;
  pos = length - 7;
  for (i = length; i >= 1; i--) {
      sum += parseInt(numbers.charAt(length - i)) * pos--;
      if (pos < 2) {
          pos = 9;
      }
  }

  result = sum % 11 < 2 ? 0 : 11 - sum % 11;
  if (result !== parseInt(digit.charAt(1))) {
      return false;
  }

  return true;
}