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Developer details building a free Spotify-to-MP3 converter and its technical stack

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A developer describes creating Spodown, a free tool that converts Spotify links into MP3 files, which handles thousands of downloads each day. Because Spotify's API does not expose audio and its streams are DRM-encrypted, the pipeline instead matches track metadata to YouTube Music results and extracts audio with yt-dlp, then transcodes it with ffmpeg. The write-up highlights the difficulty of accurate track matching, a scoring system for candidate results, and a Widevine-based fallback for tracks missing on YouTube. It also covers caching to avoid repeated work, rate-limit management through proxy rotation, and the decision to make the site server-rendered for search visibility.

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