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Node.js cheat sheet & developer notes

Node.js cheat sheet and 3 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Node.js

Interview Questions

Node.js Interview Questions. Fundamentals. 1. What is Node.js?. Node.js is a JavaScript runtime built on Chrome's V8 engine. It enables JavaScript to run on the server, with non-blocking I/O and event-driven architecture…

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02 · Node.js

Modules & NPM Ecosystem

Node.js Modules & NPM. CommonJS vs ES Modules. // CommonJS (default in Node.js) // utils.js function add(a, b) { return a + b; } module.exports = { add }; // or: exports.add = add; // app.js const { add } = require('./ut…

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03 · Node.js

Event Loop & Async Programming

Node.js Event Loop & Async Programming. The event loop is the heart of Node.js. It enables non-blocking I/O operations despite JavaScript being single-threaded.. The Event Loop. // Event loop phases: // 1. Timers (setTim…

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Concepts to know for Node.js

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Closures and ScopeHow JavaScript resolves a variable, why a function keeps its birthplace alive, the loop puzzle, stale closures in React, and what closures cost in memory.Intermediate·13 minPrototypes and Inheritance in JavaScriptHow every object links to a prototype, how property lookup walks that chain, what new and class really do, and how prototype pollution turns it into a bug.Intermediate·13 minthis Binding in JavaScriptThe four call-site rules that decide what this is, why arrow functions ignore them, how methods lose this when passed around, and how to get it back.Intermediate·12 minES Modules vs CommonJS: How JavaScript Modules LoadWhy require runs a file on the spot while import builds the whole graph first, what live bindings and circular imports do, and how Node picks a module system.Intermediate·14 minGarbage Collection and Memory LeaksHow a garbage collector decides what is alive by tracing from roots, why generations and pauses matter for latency, and how JavaScript apps still leak memory.Intermediate·13 minThe Event Loop: Microtasks vs MacrotasksHow JavaScript runs async code on a single thread, why promise callbacks beat setTimeout, and how to predict the output of any ordering puzzle.Intermediate·12 min

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