Export Goodreads reading stats for plotting by Google Sheets

goodreads_plotter.js

/*
 * This script is now deprecated as it integrated into my Google Chrome extension:
 * https://chrome.google.com/webstore/detail/goodreads-stats/hdpkeldenopncgodhpjdlpngmnaijpjf?hl=en&authuser=0
 *
 * The extension adds easy export functionality to Goodreads, along with plotting capabilities
 */

/*
 * Open this page:
 * https://www.goodreads.com/review/list/83169518?ref=nav_mybooks
 * (replace id with your user id)
 * Turn on infinite scroll
 * Scroll all the way down to load all entries
 * Open Chrome DevTools
 * Run the following script:
 */

const monthFormatter = new Intl.DateTimeFormat(undefined, { month: 'long' });
const months = Array.from({ length: 12 }, (_, month) =>
  monthFormatter.format(new Date(0, month, 2, 0, 0, 0))
);

Object.entries(
  document.body.getElementsBySelector('#booksBody .date_read .date_row span')
  .map(d=>d.textContent)
.reduce((dates, date) => {
    if (!date.includes(',')) {
      const dateParts = date.split(' ');
      date = `${dateParts[0]} 1, ${dateParts[1]}`;
    }
    let [monthDay, year] = date.split(',');
    year = year.trim();
    if (year === 'set') return dates;
    let [month, day] = monthDay.split(' ');
    if (day[0] === '0') day = day.slice(1);
    dates[year] ??= Object.fromEntries(
      months.map((month) => [
        month,
        Object.fromEntries(
          Array.from({
            length: new Date(year, months.indexOf(month), 0).getDate() - 1,
          }).map((_, day) => [day + 1, 0])
        ),
      ])
    );
    dates[year][month] ??= {};
    dates[year][month][day] ??= 0;
    dates[year][month][day] += 1;
    return dates;
  }, {})
)
  .map(([year, yearData]) =>
    Object.entries(yearData).reduce(
      ([yearTotal, entries], [month, monthData]) => {
        const [monthTotal, monthEntries] = Object.entries(monthData).reduce(
          ([total, entries], [day, count]) => [
            total + count,
            [
              ...entries,
              [`${year} ${month} ${day}`, yearTotal + total + count],
            ],
          ],
          [0, []]
        );
        return [yearTotal + monthTotal, [...entries, ...monthEntries]];
      },
      [0, []]
    )
  )
  .flat(2)
  .filter(Array.isArray)
  .map((row) => row.join('\t'))
  .join('\n');