yt2mp3

Extract audio from YouTube videos. Paste a URL, download the audio in YouTube's native format (Opus/AAC).

Built with Nuxt 4, Vue 3, TypeScript, and NuxtUI v4.

Usage

1. Paste a YouTube URL (watch, embed, shorts, youtu.be) or a bare video ID
2. Click Extract — the server fetches video metadata and stream URLs
3. Review the video info and click Download Audio
4. Audio is saved in YouTube's native format (no MP3 transcoding)

Development

pnpm install
pnpm dev

Commands

Command	Action
pnpm dev	Start dev server at localhost:3000
pnpm build	Production build (Vercel preset)
pnpm lint	Run ESLint
pnpm typecheck	Run TypeScript checks

Deploy

vercel --prebuilt

How it works

1. The server creates an Android InnerTube session via youtubei.js (cached with UniversalCache)
2. When a URL is submitted, it calls YouTube's private /player API endpoint (retries across 5 client types across 3 rounds with session resets)
3. Audio stream URLs are extracted and returned to the client
4. Clicking Download Audio sends the CDN URL back to the server, which proxies the audio with proper Android User-Agent headers (exponential backoff on 429)
5. If the CDN URL has expired or YouTube rejects it, the server re-extracts a fresh URL automatically