let nextUrl = 'https://api.wanikani.com/v2/subjects?types=kanji';
  let results = [];
  while (nextUrl) {
    const response = await fetch(nextUrl, {
      method: 'GET',
      headers: { Authorization: `Bearer ${API_TOKEN}` },
    });
    const body = await response.json();
    nextUrl = body.pages.next_url;
    results.push(...body.data);
  }