Fetches and sums up the total hours you’ve spent watching anime from your Kitsu library

kitsu-watchtime.js

import fetch from 'node-fetch';

async function getTotalHoursWatched(userId) {
  let page = `https://kitsu.io/api/edge/library-entries?filter[userId]=${userId}&include=anime&page[limit]=20`;
  let totalMinutes = 0;
  let totalEpisodes = 0;
  const processedAnimeIds = new Set();
  let nullAnimeDataCount = 0;

  while (page) {
    const response = await fetch(page);
    const data = await response.json();
    const entries = data.data;
    const includedAnime = data.included || [];

    for (let entry of entries) {
      const animeData = entry.relationships.anime.data;
      if (!animeData) {
        nullAnimeDataCount++;
        continue;
      }

      const animeId = animeData.id;
      const anime = includedAnime.find(a => a.id === animeId);
      if (anime) {
        const episodeLength = anime.attributes.episodeLength || 0;
        const progress = entry.attributes.progress || 0;
        totalMinutes += episodeLength * progress;
        totalEpisodes += progress;
        processedAnimeIds.add(animeId);
      }
    }

    page = data.links && data.links.next ? data.links.next : null;
  }

  if (nullAnimeDataCount > 0) {
    console.warn(`${nullAnimeDataCount} entries had null anime data`);
  }

  return {
    hoursWatched: totalMinutes / 60,
    totalAnime: processedAnimeIds.size,
    totalEpisodes
  };
}

getTotalHoursWatched('USER_ID').then(result => {
  console.log(result);
});