Deep Dive into Node.js Architecture and Internal Workings

This article explores Node.js's internal architecture, explaining how V8, Libuv, and C++ bindings work together. It details the startup sequence when running a Node.js file and breaks down the Event Loop's four main phases (timers, I/O polling, setImmediate, close callbacks) alongside the configurable Thread Pool that handles CPU-intensive async tasks. The design enables Node.js to remain single-threaded for JavaScript execution while achieving high concurrency in I/O-heavy workloads.