The Code node: when code is actually needed

// Rejim / Mode: Run Once for All Items
// Bütün item-lərə çıxış var / access to every item at once

const items = $input.all();

// Regionlara görə qruplaşdır / group by region
const byRegion = {};
for (const item of items) {
  const region = item.json.region ?? 'unknown';
  byRegion[region] ??= { region, total: 0, count: 0 };
  byRegion[region].total += Number(item.json.amount) || 0;
  byRegion[region].count += 1;
}

// Hər qrup üçün bir item qaytar / return one item per group
return Object.values(byRegion).map((row) => ({ json: row }));

// Rejim / Mode: Run Once for Each Item
// $json cari item-in datasıdır / $json is the current item's data

const raw = $json.phone ?? '';
const digits = raw.replace(/\D/g, '');

return {
  json: {
    ...$json,
    phoneNormalized: digits.startsWith('994') ? `+${digits}` : `+994${digits}`,
    isValid: digits.length >= 9,
  },
};