Downloader Tampermonkey — Local Youtube

let videoTitle = titleElem.innerText.trim(); // Sanitize filename videoTitle = videoTitle.replace(/[\\/*?:"<>

async function fetchStreams(videoId, type, videoTitle) const apiUrl = `https://www.youtube.com/youtubei/v1/player?key=AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8`; const data = videoId: videoId, context: client: clientName: "WEB", clientVersion: "2.20230101.00.00" ;

// Wait for page to load setTimeout(addDownloadButtons, 3000); local youtube downloader tampermonkey

function addDownloadButtons() // Avoid duplicate buttons if (document.querySelector('.yt-download-btn')) return;

yt-dlp -f "bestvideo+bestaudio" --merge-output-format mp4 "https://youtu.be/..." But for quick, local, no-install needs, the Tampermonkey script above works as a . let videoTitle = titleElem

function createButton(text, type) const btn = document.createElement('button'); btn.innerText = text; btn.className = 'yt-download-btn'; btn.style.backgroundColor = '#cc0000'; btn.style.color = 'white'; btn.style.border = 'none'; btn.style.padding = '6px 12px'; btn.style.borderRadius = '18px'; btn.style.cursor = 'pointer'; btn.style.fontWeight = 'bold'; btn.style.fontSize = '14px'; btn.style.margin = '0 4px'; return btn;

let selectedStream = null; if (type === 'video') // Best quality MP4 with both video+audio selectedStream = allFormats.find(f => f.mimeType.includes('video/mp4') && f.hasVideo && f.hasAudio); if (!selectedStream) // Fallback: video only + audio only merge not supported in simple script selectedStream = allFormats.find(f => f.mimeType.includes('video/mp4') && f.hasVideo); else // Best audio only (prefer audio/mp4 which can be renamed .m4a or .mp3) selectedStream = allFormats.find(f => f.mimeType.includes('audio/mp4') && f.audioChannels); if (!selectedStream) selectedStream = allFormats.find(f => f.mimeType.includes('audio/webm')); let videoTitle = titleElem.innerText.trim()

if (!selectedStream catch (err) console.error(err); alert("Failed to fetch video info. YouTube API may have changed.");

function downloadStream(url, filename) // Use GM_download if available (Tampermonkey) if (typeof GM_download !== 'undefined') GM_download( url: url, name: filename, saveAs: true ); else // Fallback: create an anchor and click const a = document.createElement('a'); a.href = url; a.download = filename; document.body.appendChild(a); a.click(); document.body.removeChild(a);

// Find the video title const titleElem = document.querySelector('h1 yt-formatted-string'); if (!titleElem) return;

try []; const allFormats = [...formats, ...adaptiveFormats];