Coupon code generator

coupon_generator.js

const fs = require('fs');

const pattern = /^MT[A-Z0-9]{7}$/;
const codeCount = 1000000;
const outputFile = 'codes_5.csv';

const codes = [];
const charset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
const charsetLength = charset.length;

while (codes.length < codeCount) {
  let code = 'MT';
  for (let i = 0; i < 7; i++) {
    code += charset.charAt(Math.floor(Math.random() * charsetLength));
  }
  if (pattern.test(code)) {
    codes.push(code);
  }
}

// Convert the codes to a CSV string
const csvContent = 'Code\n' + codes.join('\n');

// Save the generated codes to a CSV file
fs.writeFileSync(outputFile, csvContent, 'utf8');

console.log(`Generated ${codes.length} unique codes and saved them to '${outputFile}'.`);