Parser for chapters provided within description of YouTube videos

yt-chapters.js

const parseChapters = (description) => {
  // Extract timestamps (either 00:00:00, 0:00:00, 00:00 or 0:00)
  const lines = description.split("\n")
  const regex = /(\d{0,2}:?\d{1,2}:\d{2})/g
  const chapters = []

  for (const line of lines) {
    // Match the regex and check if the line contains a matched regex
    const matches = line.match(regex)
    if (matches) {
      const ts = matches[0]
      const title = line
        .split(" ")
        .filter((l) => !l.includes(ts))
        .join(" ")

      chapters.push({
        timestamp: ts,
        title: title,
      })
    }
  }

  return chapters
}

  const allElements = Array.from(
    document.querySelectorAll(
      "#panels ytd-engagement-panel-section-list-renderer:nth-child(2) #content ytd-macro-markers-list-renderer #contents ytd-macro-markers-list-item-renderer #endpoint #details"
    )
  );

  const withTitleAndTime = allElements.map((node) => ({
    title: node.querySelector(".macro-markers")?.textContent,
    timestamp: node.querySelector("#time")?.textContent,
  }));

  const filtered = withTitleAndTime.filter(
    (element) =>
      element.title !== undefined &&
      element.title !== null &&
      element.timestamp !== undefined &&
      element.timestamp !== null
  );

  const withoutDuplicates = [
    ...new Map(filtered.map((node) => [node.timestamp, node])).values(),
  ];

  return withoutDuplicates;
}```