Node.js: require vs import - ES Modules for Efficient Code

🚀 I Finally Understood the Node.js Event Loop And it made Node.js make so much more sense. Most developers use Node.js daily. But very few understand what happens behind the scenes. Here are 3 things I learned today 👇 🔹 1. Node.js Uses libuv libuv powers the event loop and handles async tasks like: • File operations • Network requests • Timers This is why Node.js is non-blocking and scalable. 🔹 2. Before the Event Loop Starts Node.js first: • Initializes the environment • Executes top-level code • Loads modules (require / import) • Registers callbacks Only then does the event loop begin. 🔹 3. Event Loop Phases Once running, Node.js processes tasks in phases: 1️⃣ Timers 2️⃣ I/O callbacks 3️⃣ Polling 4️⃣ setImmediate 5️⃣ Close callbacks Understanding this helps write better async code. Big thanks to Hitesh Choudhary, Piyush Garg, Jay Kadlag for the amazing explanation. #NodeJS #JavaScript #BackendDevelopment #WebDevelopment

🚀 𝗡𝗼𝗱𝗲.𝗷𝘀 𝘃𝘀. 𝗘𝘅𝗽𝗿𝗲𝘀𝘀.𝗷𝘀 — 𝗞𝗻𝗼𝘄 𝘁𝗵𝗲 𝗗𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝗰𝗲! A common question for those starting with backend development: "Should I use Node or Express?" The truth is, it’s not an "Either/Or"—it’s an "And." 👉 The Engine vs. The Toolkit 🛠️ 𝗡𝗼𝗱𝗲.𝗷𝘀 𝗶𝘀 𝘁𝗵𝗲 𝗘𝗻𝗴𝗶𝗻𝗲 It’s the JavaScript runtime built on Chrome's V8 engine. It allows you to run JavaScript outside the browser. Think of it as the powerhouse that handles your server-side logic. 🧰 𝗘𝘅𝗽𝗿𝗲𝘀𝘀.𝗷𝘀 𝗶𝘀 𝘁𝗵𝗲 𝗧𝗼𝗼𝗹𝗸𝗶𝘁 It’s a minimal and flexible framework built on top of Node.js. It simplifies things like routing, middleware, and handling HTTP requests. 𝗪𝗵𝘆 𝘄𝗲 𝘂𝘀𝗲 𝘁𝗵𝗲𝗺 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿: While you can build a server using just Node.js (with the http module), it requires a lot of manual code. Express turns 50 lines of "pure" Node code into 5 lines of readable, maintainable logic. 𝗠𝘆 𝗧𝗮𝗸𝗲: In 2026, efficiency is everything. Unless you are building something extremely low-level, Express (or similar frameworks like Fastify) is the standard for getting high-performance APIs into production quickly. 𝗪𝗵𝗶𝗰𝗵 𝗼𝗻𝗲 𝗮𝗿𝗲 𝘆𝗼𝘂 𝗹𝗲𝗮𝗿𝗻𝗶𝗻𝗴/𝘂𝘀𝗶𝗻𝗴 𝗿𝗶𝗴𝗵𝘁 𝗻𝗼𝘄? 𝗟𝗲𝘁’𝘀 𝘁𝗮𝗹𝗸 𝘁𝗲𝗰𝗵 𝗯𝗲𝗹𝗼𝘄! 👇 #NodeJS #ExpressJS #BackendDevelopment #JavaScript #WebDevelopment #Coding #SoftwareEngineering #TechInsights

💡 Node.js Tip: Handle Async Errors Properly One mistake many developers make in Node.js APIs is not handling async errors correctly. Instead of writing this in every controller: ❌ try/catch everywhere It quickly makes the code messy and hard to maintain. A better approach is to create an async error handler wrapper. Example: const asyncHandler = (fn) => (req, res, next) => Promise.resolve(fn(req, res, next)).catch(next); Now you can write cleaner controllers: const getUsers = asyncHandler(async (req, res) => { const users = await userService.getUsers(); res.json(users); }); ✅ Cleaner controllers ✅ Centralized error handling ✅ Easier debugging Small improvements like this make a big difference in production APIs. How do you handle errors in your Node.js applications? #NodeJS #BackendDevelopment #JavaScript #WebDevelopment #Coding

🚀 Just dropped a new video in my Web Development Series! Today, I covered one of the most important concepts in backend development — Node.js Modules. If you're a beginner, this will help you understand how to: • Organize your code properly • Use require() and module.exports • Build reusable modules • Structure real-world Node.js applications I’ve explained everything in a very simple and beginner-friendly way, so you can follow along easily. 🎥 Watch here: https://lnkd.in/gfhUWPVG Let me know your thoughts in the comments 👇 #nodejs #webdevelopment #backenddevelopment #javascript #coding #programming #learncoding #jdcodebase

⚡ JavaScript’s Promise.all() — Great Power, Hidden Risk Promise.all() is one of the most commonly used async tools in Node.js and TypeScript. But many developers forget one important detail: If one promise fails, everything fails. 🔎 Why this matters When running multiple async operations in parallel: • External API calls • Database queries • File uploads • Microservice requests • Background tasks A single rejection will cause the entire Promise.all() to reject. Even if the other operations succeed. ✅ For a safer alternative when partial results are OK use Promise.allSettled() ⚙️ Runtime support Promise.allSettled() is supported in: ✅ Node.js 12+ ✅ Chrome 76+ ✅ Firefox 71+ ✅ Safari 13+ So it’s safe in basically every modern backend runtime. Small async decisions like this can prevent subtle production failures. Especially in API orchestration, microservices, and NestJS backends. #NodeJS #JavaScript #WebDevelopment #Tech #DesignPatterns #FrontendDevelopment #DeveloperLife #Backend #BackendDeveloper #TypeScript #CodingTips #DeveloperBestPractices

Most developers use require() in Node.js every day, but very few know what actually happens behind the scenes. While exploring the Node.js source code, I found that require() follows a series of internal steps before a module is available in your application. Here’s a simplified breakdown of how it works: Step 1: Resolving the module Node first determines where the module exists. It checks for local files, JSON files, and modules inside the node_modules directory. Step 2: Loading the module Once the correct file is found, Node reads the file content depending on the file type such as .js, .json, or .node. Step 3: Compilation For JavaScript files, Node wraps the module inside an IIFE (Immediately Invoked Function Expression). This creates the familiar function wrapper: (function (exports, require, module, __filename, __dirname) { // module code }); Step 4: Evaluation The wrapped function is executed, and whatever is assigned to module.exports becomes the exported value. Step 5: Caching Finally, the module is cached. If the same module is required again, Node returns the cached version instead of executing it again, which improves performance. Understanding this process helped me better appreciate how Node.js manages modules internally. If you're learning backend development with Node.js, exploring the runtime source code can reveal many interesting insights about how JavaScript actually runs behind the scenes. #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #OpenSource #SoftwareEngineering

For years, JavaScript only ran in the browser. Then Node.js changed everything. 🚀 Suddenly JavaScript could run on the server — and the entire web development game shifted. Here's why Node.js + Express is such a powerful combo for backend devs: ⚡ Non-blocking I/O — handles thousands of simultaneous requests without choking 🛣️ Express routing — map a URL to a function in literally 2 lines of code 📦 npm ecosystem — 2 million+ packages ready to install 🔗 One language everywhere — JavaScript on frontend AND backend I picked it up while building ShopNest alongside Flask — and the two complement each other really well for a dual-backend architecture. Flask for Python-heavy logic. Express for fast, scalable API endpoints. Are you a Flask dev, an Express dev — or both? 👇 #NodeJS #ExpressJS #JavaScript #BackendDevelopment #WebDevelopment #PythonDeveloper #FullStackDev #LearnToCode #BuildInPublic #TechStudent #100DaysOfCode #Programming #IndianDeveloper #SoftwareDevelopment

🚀 What I Learned Today: Node.js Internals • Node.js runs JavaScript on a single main thread • Top-level code executes first before the event loop starts • Import statements load during initialization • Event Loop manages asynchronous operations Event Loop Phases: • Timers → setTimeout() / setInterval() • I/O Polling → file system & network operations • Check → setImmediate() (Node.js specific) • Close Callbacks → cleanup tasks • Node.js uses a libuv worker thread pool (default: 4 threads) • Thread pool size can be changed using process.env.UV_THREADPOOL_SIZE https://lnkd.in/gwFG5WVW thank you Piyush Garg sir Hitesh Choudhary sir Akash Kadlag sir #chaiaurcode #NodeJS #JavaScript #Backend #EventLoop

Node.js is single-threaded. Then how does it handle thousands of requests at the same time? It’s not magic.   It’s the event loop. Here’s the simple idea. Blocking code ❌ - Waits for a task to finish before moving on.   - One request can stop everything.   - Common in traditional synchronous systems.  Non-blocking code 🚀 - Starts a task and moves to the next one.   - Doesn’t wait for I/O operations (DB, API, file).   - Handles many requests efficiently.  When Node.js receives a request: 1. It sends I/O tasks to the system (like DB or network).   2. It doesn’t wait for them to finish.   3. It keeps processing other requests.   4. When the task completes, the event loop picks the callback.  Instead of many threads,   Node.js uses asynchronous I/O. Without async: “Wait until this finishes.” With async: “Tell me when it's done.” Good backend systems handle requests.   Great backend systems never block the event loop. What are your favourite ways to avoid blocking in Node.js projects? 👍 Like, 💬 comment, and ➕ follow for more posts like this. 🙏 Thanks for reading. Have a great day 🌱 #NodeJS #Backend #JavaScript #WebDevelopment #SoftwareEngineering