Mux

# Mux Documentation for LLMs > Mux is how developers build online video. Mux provides a complete video platform that includes: > - Video hosting, encoding, and streaming infrastructure > - A modern, responsive video player with adaptive controls > - Video analytics and performance monitoring > - all with a great developer experience and surprisingly affordable pricing ## Quick start: What are you trying to do? - **Upload and stream a video file** → Start with /docs/core.txt, then /docs/guides/video.txt - **Build a video player** → /docs/guides/player.txt - **Handle file uploads from users** → /docs/guides/uploader.txt - **Track playback metrics and analytics** → /docs/guides/data.txt - **Set up a live stream** → /docs/core.txt (live streams section) + /docs/guides/video.txt - **Integrate with a web framework (Next.js, Rails, etc.)** → /docs/integrations.txt - **Need the full API reference** → /api-spec.json ## Common mistakes to avoid - **Never expose Mux API credentials in client-side code.** All API calls must come from a server. Use direct uploads or signed URLs for client-side operations. - **Don't poll the assets endpoint to check status.** Use webhooks instead. The `video.asset.ready` event tells you when an asset is ready for playback. - **Don't confuse Asset IDs with Playback IDs.** Asset IDs (used with api.mux.com) are for managing assets. Playback IDs (used with stream.mux.com) are for streaming to viewers. - **Don't expose stream keys in public code.** Treat s […truncated]