Node 21 finally ships with a built-in WebSocket client — no more pulling in ws or socket.io-client for a basic browser-style API on the server side. Deno and Bun have shipped this for a while; this closes the gap.
The full post (written just ahead of the v21 release) tracks the upstream Undici PR and the long-running Node issue thread that pushed it across the finish line, with a link to the v21 release announcement once it landed.
Originally published at andreasbergstrom.dev — read the full post there.
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