ColdFusion has had native WebSocket support since ColdFusion 10, and — contrary to a common worry — it was not removed or deprecated in the ColdFusion 2025 release (the 2025 removals targeted Flash/Flex-dependent UI tags and mobile features, not WebSockets). The tag creates a client-side JavaScript WebSocket object, you define channels in Application.cfc, and you push messages from server-side CFML with the built-in WsPublish() function. That means you can build live chat, real-time dashboards, push notifications, collaborative features, and live data feeds entirely in ColdFusion — no Node.js, no separate Socket.IO server, no second runtime to operate. The main caveats: WebSocket is an Adobe ColdFusion feature (not supported on Lucee), and in production you must ensure your proxy/load balancer allows WebSocket traffic and use WSS (secure WebSockets).
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Deepak Sir
Posted on • Originally published at Medium
ColdFusion WebSocket Support: Building Real-Time Features Without Switching to Node.js
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