What is mediasoup?

Mediasoup is a WebRTC library that makes it easy to build video conferencing applications. If you're building a Zoom-like product or any app where people need to see and hear each other in real time over the internet, mediasoup handles the hard part: efficiently routing video and audio streams between participants. At its core, mediasoup acts as a middleman (called an SFU, or Selective Forwarding Unit) that receives video and audio from each participant and intelligently decides who should receive what streams. Instead of sending every participant's video to every other participant, which gets expensive fast, mediasoup only forwards the streams that are actually needed. On the server side, you install it as a Node.js module and control it through code, on the client side (in the browser), it's a lightweight SDK that handles the technical WebRTC details. The project intentionally stays focused: it only manages the media transmission layer, not the chat, user interfaces, or how participants signal to each other, so you have full control over those pieces. The demo at demo.mediasoup.org shows this in action, you can join a video call with other people and see how it works in practice. Who would use this? Startup founders or teams building communication platforms, companies that need to add video calls to existing apps, or anyone rolling their own video conferencing tool rather than relying on a third-party service. It's built to be compatible with all major modern browsers and keeps the API clean and modern, avoiding unnecessary complexity. One notable design decision is that mediasoup doesn't care how participants discover each other or send control messages, you choose that part. This flexibility means you can integrate it with whatever signaling system you already have, whether that's WebSockets, a custom protocol, or something else entirely.