node-ws - 1.1.0+ds1.e6ddaae4-5+deb10u1 main

ws is a simple to use websocket implementation, up-to-date against RFC-6455,
and probably the fastest WebSocket library for Node.js.
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Passes the quite extensive Autobahn test suite. See
http://einaros.github.com/ws for the full reports.
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It also provides wscat, a command-line tool which can either act
as a server or a client, and is useful for debugging websocket services.
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Node.js is an event-based server-side javascript engine.