SMRTR ProgrammingAug 26, 2026Dev.to

The Node.js Event Loop, Explained Simply (with Examples)

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Node.js uses an event loop to handle thousands of concurrent requests on one thread, offloading slow I/O work and processing results asynchronously. CPU-heavy tasks break this model, and microtasks like `process.nextTick()` always run before `setImmediate` or `setTimeout`.

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