nigeria-validator/src/which-nextwork.js

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

function getNigerianNetwork(phone) {
  const cleaned = phone.replace(/\D/g, "");

  
  let normalized = cleaned;
  if (cleaned.startsWith("234")) {
    normalized = "0" + cleaned.slice(3);
  }

  // Get the first 4 digits
  const prefix = normalized.slice(0, 4);

  const mtnPrefixes = [
    "0803",
    "0806",
    "0703",
    "0706",
    "0810",
    "0813",
    "0814",
    "0816",
    "0903",
    "0906",
    "0913",
    "0916",
  ];
  const gloPrefixes = ["0805", "0705", "0811", "0815", "0905", "0915"];
  const airtelPrefixes = [
    "0802",
    "0808",
    "0708",
    "0812",
    "0701",
    "0902",
    "0907",
    "0901",
    "0912",
  ];
  const etisalatPrefixes = ["0809", "0817", "0818", "0909", "0908"];

  if (mtnPrefixes.includes(prefix)) return "MTN";
  if (gloPrefixes.includes(prefix)) return "Glo";
  if (airtelPrefixes.includes(prefix)) return "Airtel";
  if (etisalatPrefixes.includes(prefix)) return "9mobile";

  return "Unknown Network";
}

module.exports = getNigerianNetwork