Node.js Cheatsheet for Developers (Quick Reference Guide)

If you're learning Node.js or working on backend applications, remembering all commands and modules can be difficult. This Node.js Cheatsheet gives you a quick reference for the most commonly used commands, modules, and patterns developers use daily. Save this guide for quick access while coding. 1. Check Node & NPM Version Before starting any project, make sure Node.js and NPM are installed. node -v npm -v 2. Initialize a Node Project Create a new Node.js project. npm init Quick setup: npm init -y This creates a package.json file. 3. Import & Export Modules Node.js uses the CommonJS module system. Import Module const fs = require("fs"); Export Module module.exports = myFunction; 4. File System Module The fs module allows you to work with files. Read a file: fs.readFile("file.txt", "utf8", (err, data) => { console.log(data); }); Write a file: fs.writeFile("file.txt", "Hello World", () => { console.log("File created"); }); Append to a file: fs.appendFile("file.txt", "More text", () => {