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Its Node.js binding, uWebSockets.js, serves as a drop-in high-performance alternative for applications that need to handle millions of concurrent connections.\n\n## What uWebSockets Does\n- Provides HTTP\u002F1.1 and WebSocket server implementations in optimized C++\n- Delivers throughput that can exceed 1 million messages per second on a single core\n- Offers a Node.js binding (uWebSockets.js) with a familiar API for JS developers\n- Supports TLS via OpenSSL or BoringSSL for encrypted connections\n- Handles pub\u002Fsub messaging patterns natively for broadcast workloads\n\n## Architecture Overview\nuWebSockets is built on top of uSockets, a minimal event-loop library written in C. The architecture avoids heap allocations on the hot path and uses epoll\u002Fkqueue for non-blocking I\u002FO. WebSocket frames are parsed with zero-copy techniques. The Node.js binding wraps the C++ core via N-API, giving JavaScript applications near-native performance without requiring a full C++ build chain.\n\n## Self-Hosting & Configuration\n- For C++ projects, install via vcpkg or include as a header-only library\n- For Node.js, install the prebuilt binary: `npm install uWebSockets.js`\n- Configure listen options (port, host, SSL certs) when calling the `.listen()` method\n- Set backpressure limits per WebSocket to control memory usage under load\n- Deploy behind a reverse proxy (Nginx, Caddy) or use its built-in TLS support directly\n\n## Key Features\n- One of the fastest HTTP and WebSocket implementations available in any language\n- Memory footprint measured in bytes per connection, not kilobytes\n- Built-in pub\u002Fsub for topic-based broadcasting without external message brokers\n- Graceful shutdown and per-socket backpressure management\n- Standards-compliant with Autobahn test suite passing\n\n## Comparison with Similar Tools\n- **ws (Node.js)** — pure JS WebSocket library; uWebSockets.js is 10-50x faster\n- **Socket.IO** — higher-level with fallbacks and rooms; uWebSockets focuses on raw protocol speed\n- **Boost.Beast** — C++ HTTP\u002FWebSocket on Boost.Asio; uWebSockets has a simpler API and lower overhead\n- **Bun** — uses a fork of uWebSockets internally for its built-in server\n\n## FAQ\n**Q: Is uWebSockets.js a drop-in replacement for ws?**\nA: The API differs slightly, but migration is straightforward. Most patterns map directly.\n\n**Q: Does it support HTTP\u002F2?**\nA: Currently it supports HTTP\u002F1.1 and WebSocket. HTTP\u002F2 is not implemented.\n\n**Q: Can I use it in production?**\nA: Yes. It powers several large-scale real-time applications in production today.\n\n**Q: What platforms are supported?**\nA: Linux, macOS, and Windows. The Node.js binding ships prebuilt binaries for all three.\n\n## Sources\n- https:\u002F\u002Fgithub.com\u002FuNetworking\u002FuWebSockets\n- 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