validate-indian-data/index.js

A simple utility to validate Indian phone numbers, PAN, Aadhar, PIN codes, and vehicle numbers.

/**
 * Validates an Indian mobile number.
 * Rules:
 * - Must be 10 digits
 * - Must start with 6, 7, 8, or 9
 */
function isValidIndianPhone(phone) {
  return typeof phone === "string" && /^[6-9]\d{9}$/.test(phone);
}

/**
 * Validates an Aadhar number.
 * Rules:
 * - Exactly 12 digits
 * - Cannot start with 0 or 1 (as per UIDAI spec)
 */
function isValidAadhar(aadhar) {
  return typeof aadhar === "string" && /^[2-9]\d{11}$/.test(aadhar);
}

/**
 * Validates a PAN card number.
 * Format:
 * - 5 uppercase letters, 4 digits, 1 uppercase letter (e.g., ABCDE1234F)
 * - The fourth letter must be one of: [P, C, H, A, B, G, J, L, F, T] (entity types)
 */
function isValidPAN(pan) {
  return (
    typeof pan === "string" &&
    /^[A-Z]{5}[0-9]{4}[A-Z]$/.test(pan) &&
    /[PCHABGJLFT]/.test(pan[3])
  );
}

/**
 * Validates an Indian PIN code.
 * Rules:
 * - 6 digits
 * - First digit can't be 0
 */
function isValidPIN(pincode) {
  return typeof pincode === "string" && /^[1-9][0-9]{5}$/.test(pincode);
}

/**
 * Validates an Indian vehicle number.
 * Format:
 * - 2 uppercase letters (state)
 * - 2 digits (district)
 * - 1–2 uppercase letters (series)
 * - 4 digits (number)
 * Examples:
 * - MH12AB1234
 * - DL01C1234
 */
function isValidVehicleNumber(vehicle) {
  return (
    typeof vehicle === "string" &&
    /^[A-Z]{2}[0-9]{2}[A-Z]{1,2}[0-9]{4}$/.test(vehicle)
  );
}

// Exporting all functions
module.exports = {
  isValidIndianPhone,
  isValidAadhar,
  isValidPAN,
  isValidPIN,
  isValidVehicleNumber
};