nigeria-validator/src/nin.js

Validate and format common Nigerian data: phone numbers, BVNs, bank codes, etc.

/**
 * Validates a Nigerian National Identification Number (NIN).
 * NIN must be exactly 11 digits.
 */
const isValidNIN = (nin) => {
  const cleaned = nin.replace(/\D/g, "");
  return /^\d{11}$/.test(cleaned);
};

module.exports = { isValidNIN };