Mastering Node's Native http Module Fundamentals

ExpressX-Cli now supports all NodeJs flags! Run project with Node: node [nodeFlags] [entry] [appFlags] Run project with expressX-Cli: expressX [nodeFlags] [appFlags] - Anything that works with node... node --inspect --max-old-space-size=4096 src/index.ts --port 3000 - now works with expressx dev! expressx dev --inspect --max-old-space-size=4096 --port 3000 Development : expressX dev/start - Start development server with hot reload expressX build - Build for production Project Setup: expressX new - Create new project expressX generate <name> - Scaffold for Conrtroller, Service, Repository... etc. Utilities: expressX --help - View all available commands expressX [command] --help - Get help for specific commands expressX --version - Check CLI version Try it out: https://lnkd.in/dts4ZEff ExpressXjs Framework: https://lnkd.in/dUKUYWum #nodejs #expressjs #cli #webdev #javascript #typescript #opensource 

Today I revised some core Node.js fundamentals: ✅ Node.js is not a framework or library — it’s a JavaScript runtime environment ✅ NPM (Node Package Manager) installs automatically with Node.js ✅ Node.js runs JavaScript on the server side, so browser features like alert() and DOM manipulation are not available ✅ Use node fileName.js to execute a file ✅ npm init creates a package.json file to manage project dependencies ✅ Node.js follows a module-based architecture using require() and module.exports ✅ Multiple functions can be exported using objects and accessed via destructuring ✅ Built-in modules like: http → for creating web servers crypto → for hashing and security Consistent revision is key to mastering backend development 🚀 #NodeJS #BackendDevelopment #JavaScript #WebDevelopment #LearningJourney #MERN

Node.js is single-threaded... but still handles thousands of requests. How? Understanding how Node.js really works helped me write more efficient, non-blocking backend code. Here’s a high-level breakdown of what powers Node behind the scenes: V8 compiles your JavaScript to machine code Node bindings handle OS-level tasks (like file & network) libuv manages the Event Loop and async operations Worker threads pick up blocking tasks in the background The result? A fast, non-blocking system that can scale even with a single thread. I used to treat Node.js like a black box. But once I understood this flow, debugging async code got a lot easier. Have you explored how the Node.js event loop works behind the scenes? #NodeJS #BackendDevelopment #JavaScript #WebPerformance #AsyncProgramming

🚀 Understanding the Node.js Event Loop (libuv) — finally clicked! While learning Node.js internals, I spent time understanding how the libuv event loop actually executes async code — and this diagram made everything crystal clear. 🔁 Key takeaway: There are two priority queues that run before every phase 👇 👉 process.nextTick() 👉 Promise callbacks (microtasks) These always execute first, even between phases. Event Loop flow (simplified): 1️⃣ Microtasks (Highest Priority) process.nextTick() Promise.then / catch / finally 👉 Executed immediately, before moving ahead 2️⃣ Timers Phase setTimeout() setInterval() ➡️ After timers finish → Node again checks microtasks 3️⃣ Poll Phase I/O operations API calls DB queries fs.readFile, network requests 👉 This is where most real backend work happens ➡️ Again → microtasks are checked 4️⃣ Check Phase setImmediate() 5️⃣ Close Phase socket close connection cleanup close callbacks 🧠 Important insight: The inner circle (nextTick + Promises) runs between every phase, which is why misuse of process.nextTick() can starve the event loop. #NodeJS #libuv #EventLoop #JavaScript #BackendEngineering #AsyncProgramming #LearningInPublic

𝗧𝗶𝗽𝘀 𝗳𝗼𝗿 𝗕𝗲𝘁𝘁𝗲𝗿 𝗡𝗼𝗱𝗲.𝗷𝘀 𝗖𝗼𝗱𝗲 You want to write good Node.js code. Here are some tips to help you: - Use async/await to avoid callback hell - Handle errors to prevent crashes - Do not hardcode configuration values - Organize your code into logical modules - Log events to debug and monitor your application - Validate user input to prevent security issues - Use connection pooling for database queries - Implement rate limiting to prevent abuse - Use caching to reduce response time These tips will help you write better Node.js code. Start with one or two tips and build from there. Some next steps: - Set up a CI/CD pipeline - Write unit and integration tests - Monitor your application with tools like Prometheus and Grafana - Consider using TypeScript Good code is about maintainability, scalability, and performance. Follow these tips to become a better Node.js developer. Source: https://lnkd.in/gNEFFuex

Have you ever ended passing request, tenant or session session information around in your function call chain and asked yourself how could you make this look cleaner? Well there is a solution in Node.js! Welcome to AsyncLocalStorage (ALS)! Many languages and runtimes provide thread-local storage (TLS). In thread-per-request servers, TLS can be used to store request-scoped context and access it anywhere in the call stack. In Node.js we have something similar, although we don't use threads to process the requests, we use async contexts. Think of ALS as “thread-local storage” for async code: it lets you attach a small context object to the current async execution chain (Promises, async/await, timers, etc.) and read it anywhere downstream without having to pass that context data around on every function call, effectively making the function/method signature leaner. What it’s great for 🔎 Log correlation (requestId in every log line) 📈 Tracing/observability (span ids, metadata) 🧩 Request-scoped context (tenant/user, feature flags) 🧪 Diagnostics (debugging async flows) But with great power comes great responsibility, (sorry for the joke). A misused ALS can cause context leak to other requests and if not carefully designed you can start losing control of where things are set and where things are read. To solve this I like to treat ALS similar to a "Redux Store Slice", so each piece of related data I need to store in the ALS is a Slice. So I have slices for: auth, DB connections, soft delete behaviors, request logging, etc. And those slices are only set at the middleware level (or in Guards/Interceptors/Pipes if you use NestJS). Have you used ALS in production? What was your main win (or gotcha)? #nodejs #javascript #backend #nestjs #distributedtracing #cleanarchitecture

1️⃣ Call Stack ⭐Executes synchronous JS code ⭐LIFO (Last In, First Out) ⭐Only one thing runs at a time 2️⃣ Web APIs (Browser / Node.js) ⭐Handles async operations: ⭐setTimeout ⭐fetch ⭐DOM events ⭐Runs outside the call stack 3️⃣ Task Queues There are two important queues 👇 🟡 Microtask Queue (HIGH priority) ⭐Promise.then ⭐async/await ⭐queueMicrotask 4️⃣ Event Loop (The Manager 🧑💼) Its job: ⭐Check if Call Stack is empty ⭐Execute ALL microtasks ⭐Take ONE macrotask ⭐Repeat 🔁 forever 🔍 One-Line Visualization (Easy to remember) CALL STACK   ↓ WEB APIs   ↓ MICROTASK QUEUE (Promises) ⭐   ↓ MACROTASK QUEUE (Timers)   ↓ EVENT LOOP 🔁 #JavaScript #EventLoop #AsyncJavaScript #WebDevelopment #FrontendDeveloper #Coding #LearnToCode #DeveloperCommunity

𝐖𝐡𝐲 𝐈 𝐜𝐡𝐨𝐨𝐬𝐞 𝐄𝐱𝐩𝐫𝐞𝐬𝐬.𝐣𝐬 𝐨𝐯𝐞𝐫 𝐭𝐡𝐞 𝐫𝐚𝐰 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐇𝐓𝐓𝐏 𝐦𝐨𝐝𝐮𝐥𝐞. 🚂 Node.js is powerful, but writing a complex server using only its built-in `http` module is like building a house from scratch. It is possible, but incredibly time-consuming. 𝐄𝐱𝐩𝐫𝐞𝐬𝐬.𝐣𝐬 is the framework that professionalizes Node.js development. It provides a thin layer of fundamental web application features without obscuring the Node.js features we know and love. • Structured Routing: Instead of giant `if/else` blocks, Express lets me write clean, readable 𝐫𝐨𝐮𝐭𝐞𝐬 like `app.get('/users')`. • The Middleware Pipeline: Express treats requests like an assembly line. I can add 𝐚𝐮𝐭𝐡𝐞𝐧𝐭𝐢𝐜𝐚𝐭𝐢𝐨𝐧, logging, and validation steps easily before the request reaches the final function. • Scalability: It allows for modular code. I can split my application into different 𝐫𝐨𝐮𝐭𝐞𝐫𝐬 𝐚𝐧𝐝 𝐜𝐨𝐧𝐭𝐫𝐨𝐥𝐥𝐞𝐫𝐬, making the codebase easy to maintain. Conclusion:- 𝐄𝐱𝐩𝐫𝐞𝐬𝐬 is the de facto standard for a reason. It prioritizes developer experience and architectural freedom, allowing me to focus on business logic rather than boilerplate code. Big thanks to Mian Ahmad Basit Ahmad Basit for the teaching. #MuhammadAbdullahWaseem #Nexskill #ExpressJS #MERNStack #Engineering #SoftwareDev