GoogleTrendsService.js

const Parser = require('rss-parser');

const parseVolumeToInt = volume => {
  const vol = volume.replace('+', '').replace(',', '');
  return Number.parseInt(vol, 10);
};

async function getGoogleTrends(url) {
  const parser = new Parser({
    defaultRSS: 2.0,
    customFields: {
      item: [['ht:approx_traffic', 'volume', { keepArray: false }]],
    },
  });
  const trends = await parser.parseURL(url);
  const items = trends.items.map(item => {
    return { name: item.title, volume: parseVolumeToInt(item.volume) };
  });
  const sorted = items.sort((a, b) => b.volume - a.volume);
  return sorted;
}

const fetchData = async (limit = 10) => {
  const [us, br] = await Promise.all([
    getGoogleTrends('https://trends.google.com/trends/trendingsearches/daily/rss?geo=US'),
    getGoogleTrends('https://trends.google.com/trends/trendingsearches/daily/rss?geo=BR'),
  ]);

  const items = [...us, ...br];
  const sorted = items.sort((a, b) => b.volume - a.volume);
  const limited = sorted.slice(0, limit);
  return limited;
};

export default { fetchData };