Ultimate WS

Ultimate WS is a drop-in replacement for the 'ws' WebSocket library, built on top of uWebSockets.js for significantly higher performance. Current stable version is 2.0.9, released with an active maintenance cadence. Key differentiators include: same API as 'ws' but ~3.7x higher send rate in benchmarks, seamless integration with Ultimate Express, support for stand-alone server, existing uWS server, and HTTPS. Requires Node.js >=20. Ships TypeScript definitions. It is useful for projects wanting to migrate from 'ws' to uWebSockets without changing code, or for those using Ultimate Express for HTTP upgrades.