A JavaScript script to automatically extract and download YouTube video URLs from a playlist page. This can be useful for exporting videos from the Watch Later playlist. For removing all videos from the Watch Later playlist please visit: https://gist.github.com/astamicu/eb351ce10451f1a51b71a1287d36880f

YouTubePlaylistVideoURLExtractor.js

function getVideoURLs() {
    const videoElements = document.querySelectorAll('a#video-title');
    const videoURLs = Array.from(videoElements).map(video => {
        const url = new URL(video.href);
        const videoId = url.searchParams.get('v');
        return `https://www.youtube.com/watch?v=${videoId}`;
    }).filter(url => url.includes('v='));
    return videoURLs;
}

function scrollToBottom() {
    return new Promise((resolve) => {
        let lastHeight = document.documentElement.scrollHeight;
        const interval = setInterval(() => {
            window.scrollTo(0, document.documentElement.scrollHeight);
            if (document.documentElement.scrollHeight > lastHeight) {
                lastHeight = document.documentElement.scrollHeight;
            } else {
                clearInterval(interval);
                resolve();
            }
        }, 1000);
    });
}

function downloadAsTextFile(data, filename) {
    const blob = new Blob([data], { type: 'text/plain' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
}

async function extractAllVideoURLsFromPlaylist() {
    await scrollToBottom();
    const videoURLs = getVideoURLs();
    const videoURLsText = videoURLs.join('\n');
    downloadAsTextFile(videoURLsText, 'youtube_playlist_video_urls.txt');
}

extractAllVideoURLsFromPlaylist();