pak-cnic-utils/index.js

A simple utility to validate and generate Pakistani CNIC numbers

// index.js

// Validate CNIC format XXXXX-XXXXXXX-X
function isValidCNIC(cnic) {
  const regex = /^[0-9]{5}-[0-9]{7}-[0-9]{1}$/;
  return regex.test(cnic);
}

// Generate a fake CNIC in the correct format
function generateFakeCNIC() {
  const getRandomDigits = (length) =>
    Array.from({ length }, () => Math.floor(Math.random() * 10)).join('');

  const part1 = getRandomDigits(5);
  const part2 = getRandomDigits(7);
  const part3 = getRandomDigits(1);
  return `${part1}-${part2}-${part3}`;
}

// Format CNIC (remove any existing formatting and reformat it)
function formatCNIC(raw) {
  const digits = raw.replace(/\D/g, ''); // Remove non-digit characters
  if (digits.length !== 13) return null;
  return `${digits.slice(0, 5)}-${digits.slice(5, 12)}-${digits.slice(12)}`;
}

module.exports = {
  isValidCNIC,
  generateFakeCNIC,
  formatCNIC,
};