index.js

const fs = require('fs');
const fetch = require('node-fetch');
const dsv = require('d3-dsv');
const {timeFormat} = require('d3-time-format');

let tracks = {};

const formatTime = timeFormat("%Y-%m-%d");

async function download(d) {
  const dateString = formatTime(d);
  console.log(dateString);
  const csv = dsv.csvParse(await (await fetch(`https://spotifycharts.com/regional/global/daily/${dateString}/download`)).text());
  csv.forEach(row => {
    const id = row.URL.match(/\/([^\/]*)$/)[1];
    if (!tracks[id]) {
      tracks[id] = {
        track: row['Track Name'],
        artist: row.Artist,
        streams: []
      };
    }
    tracks[id].streams.push({ date: dateString, streams: +row.Streams, position: +row.Position });
  });
}


async function run() {
  const start = new Date('2018-01-01');
  const end = new Date('2018-03-27');
  const now = new Date(start);
  while (now <= end) {
    console.log(`Downloading ${now}`);
    await download(new Date(now));
    now.setDate(now.getDate() + 1);
  }

  tracks = Object.entries(tracks).map(([id, track]) => ({id, track}));

  fs.writeFileSync('tracks.json', JSON.stringify({
    tracks,
    range: [formatTime(start), formatTime(end)]
  }, null, 2));
}

run();