Server-Sent Events Offer a Lighter Alternative to WebSockets for Real-Time Dashboards

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Developer and technical writer Marcela Zapata Vanegas argues that WebSockets, while popular for real-time features, are unnecessarily complex for strictly one-way data flows such as live metrics dashboards, stock tickers, and news feeds. Server-Sent Events (SSE) operate over standard HTTP, require no custom protocols, and include built-in browser support for automatic reconnection. SSE uses a single long-lived HTTP connection, making it more resource-efficient than WebSockets when the server only needs to push data to the client. Zapata Vanegas demonstrates a working implementation using a Node.js and Express backend paired with the browser's native EventSource API, with no additional libraries needed on either side. The full source code for the dashboard has been published on her GitHub repository.

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