Node.js 21, the latest release of the open source cross-platform JavaScript runtime, has arrived, featuring a built-in WebSocket client and support for globs in the platform’s test runner.

Announced October 17, Node.js 21 is equipped with an experimental, browser-compatible WebSocket implementation, enabled through the --experimental-websocket flag. WebSocket enables two-way communication between a browser and server, with no need to poll the server for a reply.

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