Event Loop

10 pages in this section.

What the event loop actually is, why Node is built around it, and how the call stack, phases, and microtasks fit together - the mental model behind every other page in this section.

Explainer Nodejs Event Loop Concurrency

Event Loop Basics

Explore 9 Node.js Event Loop examples, from basic call stack order to microtask execution, and understand how synchronous code impacts performance.

Nodejs Event Loop Basics Async

libuv Phases

Learn the fixed order of libuv event loop phases to understand timer drift, setImmediate behavior, and when I/O callbacks execute.

Nodejs Event Loop Libuv Phases

Microtasks vs Macrotasks

Understand the execution order of microtasks (Promises, process.nextTick) and macrotasks (timers, setImmediate) in Node.js to debug timing issues.

Nodejs Event Loop Microtasks Macrotasks

async/await in Node

Learn how to use async/await in Node.js to write clear asynchronous code, handle errors, and avoid common pitfalls with practical examples.

Nodejs Event Loop Async Await Error Handling

Callbacks vs Promises Migration

Nodejs Event Loop Callbacks Promises

Timers & Scheduling

Nodejs Event Loop Timers Scheduling

Detecting Event-Loop Blockage

Nodejs Event Loop Perf Hooks Monitoring

Event Loop Best Practices

Optimize Node.js event loop performance under load. Learn to offload CPU-heavy tasks, batch I/O operations, and measure lag to maintain responsiveness.

Nodejs Event Loop Best Practices Performance

Event Loop Highlights Summary

A single-page roundup of every highlight bullet from the 9 pages in the Event Loop section, grouped by source page so you can scan all 36 takeaways without opening each article individually.

Highlights Summary Event Loop

Event Loop

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Event Loop