Backend Internals #6: How the Node.js Event Loop Handles Async Operations

Short summary

A beginner-friendly explanation of the Node.js Event Loop covering how single-threaded JavaScript delegates async work to libuv. It walks through event loop phases (Timers, Pending Callbacks, Poll, Check, Close) and the execution order of process.nextTick, Promises, Timers, and setImmediate. The content is a standard rehash of well-documented Node.js internals with no novel insights.

• •Explains how Node.js delegates async operations to libuv while JavaScript continues executing
• •Covers event loop phases and callback execution order (nextTick > Promise > Timers > setImmediate)
• •Entry-level tutorial with code examples but no depth beyond standard documentation

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