Next.js 16: 4 Habits to Delete from Your Brain

Node.js is single-threaded... or is it? Meet libuv, the hidden powerhouse. 🏗️ We all know the mantra: "Node.js is single-threaded and non-blocking." But have you ever stopped to ask how a single thread can handle thousands of concurrent database queries and file reads without breaking a sweat? The answer isn't just "Magic"—it’s libuv. 🧐 What is libuv? Libuv is a multi-platform C library originally written for Node.js. While the V8 engine handles your JavaScript, libuv handles everything else: the Event Loop, the Thread Pool, and all things Asynchronous. 🛠️ The 2 Secret Weapons of libuv: 1. The Event Loop (The Conductor) 🎼 This is the heart of Node.js. It manages the execution of callbacks. It doesn’t do the heavy lifting itself; instead, it coordinates tasks across different phases (Timers, I/O Polling, Check, etc.). 2. The Thread Pool (The Workers) 👷♂️ Wait, I thought Node was single-threaded? JavaScript execution is, but libuv maintains a Thread Pool (4 threads by default). When you do something "heavy" like: Reading a file (fs.readFile) Hashing a password (crypto.pbkdf2) DNS lookups ...libuv offloads these tasks to its worker threads so your main thread stays free to handle new requests. 🔄 How it works in 3 steps: The Request: You call an async function in JS. The Hand-off: Node.js passes the task to libuv. Libuv either asks the OS for help (for networking) or uses its Thread Pool (for files). The Callback: Once the task is done, libuv pushes the callback into the Event Loop to be executed back in your JavaScript code. 💡 Why should you care? Understanding libuv is the difference between a developer who just writes code and an engineer who knows how to optimize it. Know when your thread pool is a bottleneck. Understand why setImmediate and setTimeout behave differently. Learn to scale apps by tweaking UV_THREADPOOL_SIZE. Are you diving into Node.js internals this year? Drop a "Building" in the comments if you want more deep dives into the Node.js architecture! 👇 #NodeJS #Backend #SoftwareEngineering #libuv #JavaScript #WebPerf #ProgrammingTips

React 19 - new game-changer: the use hook! If you're tired of writing the same useEffect + useState boilerplate for every single API call, this one's for you. Here’s why your code is about to get a whole lot cleaner. 🛑 The "Old" Way (Boilerplate Central) We’ve all been there. You want to fetch data, so you: Initialize state (data, loading, error). Trigger useEffect. Handle the async promise. Update state... and hope you didn't forget the cleanup! ✨ The "React 19" Way (Clean & Declarative) With the new use hook, you can "unwrap" promises directly in your render. No more manual loading states—React handles the "waiting" part using Suspense. JavaScript import { use } from 'react'; // 1. Your standard fetch function const fetchUserData = fetch('/api/user').then(res => res.json()); function UserProfile() { // 2. Just 'use' it! const user = use(fetchUserData); // 3. No 'if (loading)' needed here! return <h1>Welcome back, {user.name}!</h1>; } 💡 Why developers love it: Conditional Hooks: You can actually use use inside if statements or loops. (Yes, really!) Bye-bye Boilerplate: It works hand-in-hand with <Suspense> for loading and <ErrorBoundary> for errors. Readable Code: Your component focuses on the UI, not the plumbing. Is useEffect dead? Not quite—but for data fetching, the use hook is definitely the new favorite child. 👶 Which should you use? Go with use if you are starting a new React 19 project and want a "native" feel with less code. It’s perfect for simple data fetching and working with Context. Stick with useEffect if you are maintaining an older codebase or need to synchronize with non-React systems (like a WebSocket or a manual DOM library). ** New Era ** Combining the use hook with an ErrorBoundary and Suspense is the "Holy Trinity" of React 19 data fetching. It moves the complexity out of your component logic and into your component structure. Check the attached image for more details. The "Safety Net" Pattern Think of Suspense as your Loading Spinner and ErrorBoundary as your Catch-All for when the API goes down. Why this is a massive upgrade: No "Jank": In the old useEffect way, the component would render once with data = null, then re-render when the data arrived. This often caused layout shifts. With use, the component doesn't even finish its first render until the data is ready. Centralized Logic: If you have 10 components fetching data, you don't need 10 if (loading) checks. You just wrap them all in one high-level Suspense boundary. Better DX (Developer Experience): Your UserProfile component is now "pure." It doesn't care about fetch logic; it just assumes the data is there when it runs. Pro Tip: Remember that React 19 makes this pattern even cleaner. You can now pass that ref down into the same Suspense tree without needing forwardRef. Stay tuned for my upcoming post regarding useRef. #React19, #ReactJS, #useHook, #ReactHooks,#JavaScript, #CleanCode, #SoftwareDevelopment, #Frontend, #ModernWeb,#SystemDesign

I've been using LLMs heavily for development on a large monolith codebase — an 8-year-old PHP/Laravel project with tons of business logic and custom implementations. Here's what actually works and what doesn't. ❌ Dumping everything into a claude.md file doesn't scale. It sounds great in theory — give the AI all the context about your project upfront. But with a large codebase, you hit context limits fast. The model either ignores half of it or gets confused by the noise. A giant knowledge base file is not the answer. ❌ Vague prompts produce vague results. "Fix the checkout flow" or "add a reporting feature" gives you generic code that doesn't fit your architecture. The vaguer your ask, the more time you spend correcting the output — sometimes more than if you'd just written it yourself. ✅ Detailed prompts + relevant file attachments = real productivity. The game-changer was treating each prompt like a mini-spec: describe the problem clearly, attach the specific files involved, and point the LLM to the right entry points. This alone cut my back-and-forth with the AI by half. ✅ Small steps or a detailed plan — pick one. Either break the task into tiny, focused steps and let the LLM handle them one by one. Or create a detailed implementation plan first, then execute it step by step. Both work. What doesn't work is asking the AI to "build the whole thing" in one shot. 🤖 Not all LLMs are equal for this kind of work. Claude tends to assume things without asking questions. If you're lucky, it guesses right. If the prompt is vague — good luck steering it back. It also doesn't follow your project's code style and loves to duplicate existing functionality rather than finding what's already there. Codex takes a different approach. It opens related files, finds existing logic before writing anything, and asks follow-up questions when something is unclear. It implements like a scalpel — just what you need for the given task, while actually respecting your code style and architecture. For a legacy Laravel monolith with years of accumulated patterns and conventions, that difference matters a lot. LLMs are incredibly powerful for development, but they're not magic. The quality of your output is directly proportional to the quality of your input — and the tool you choose matters more than you'd think. #SoftwareDevelopment #AI #LLM #CodingWithAI #DeveloperProductivity #Laravel #PHP

🌐 Internet Fundamentals (Think Like the Web) Go beyond “what is HTTP?” Understand: HTTP lifecycle (request → response → status codes) DNS resolution flow TCP vs UDP How browsers render pages (critical rendering path) Caching (browser + CDN) How hosting actually works (VPS vs shared vs serverless) Production mindset: Why is this API slow? Why is TTFB high? Why does caching break after deploy? 🎨 HTML / CSS (Structure Like an Engineer) Master: Semantic HTML Accessibility (ARIA, screen readers) Flexbox + Grid Responsive design CSS architecture (BEM, modular CSS) Production mindset: Can another dev understand your layout? Is your UI accessible? Does it break on Safari? ⚡ JavaScript (Deep Before Frameworks) Before touching React or Vue.js, master: Scope & closures Event loop Promises & async/await Prototypes ES6+ features Memory & garbage collection Production mindset: Why is this re-render happening? Why is this memory leaking? Why is this async code failing silently? 🐧 Linux & Servers (Underrated Superpower) Learn: Terminal navigation SSH File permissions Nginx basics Environment variables Process managers (PM2) Production mindset: Why did the server crash? Why is the port blocked? Why does it work locally but not in production? 💻 Backend Language (Go Deep, Not Wide) Pick one: Node.js Python Java Go PHP Understand: How the runtime works Concurrency model Memory handling Framework internals (don’t just use them blindly) Production mindset: Can this handle 10k users? What happens under load? Where is the bottleneck? 🗄 Databases (Think in Data) SQL: Indexing Query optimization Joins Normalization NoSQL: Document structure Trade-offs When not to use it Tools: PostgreSQL MySQL MongoDB Production mindset: Why is this query slow? Do we need an index? Should this be relational? 🔗 APIs (System Thinking) Learn: REST principles Status codes properly Authentication (JWT, sessions) Rate limiting Pagination Bonus: GraphQL basics Production mindset: Can this API scale? Is it secure? Is it versioned? 🔐 Security (Non-Negotiable) Understand: HTTPS & TLS CORS XSS CSRF SQL Injection OWASP Top 10 Production mindset: What can an attacker exploit? Are secrets exposed? Are passwords hashed correctly? ⚛ Frontend Framework (Master One) Choose: React Angular Go deep: State management Performance optimization Rendering behavior SSR vs CSR Production mindset: Why is Lighthouse score low? Why does hydration fail? How big is the bundle size? 🚀 What Makes You Production-Ready? This is what most roadmaps miss: ✅ Version Control Master Git (branching, rebasing, PR workflows). ✅ Testing Unit testing Integration testing E2E testing ✅ DevOps Basics CI/CD Docker Cloud deployment (AWS/GCP/Azure basics) ✅ System Design Basics Load balancers Caching layers Message queues Horizontal vs vertical scaling 💡 The Real Secret Full Stack isn’t about: “I know React + Node.” It’s about: “I understand how a request travels from the browser to the database and back — and where it can fail.”

Node.js — The Runtime That Changed What JavaScript Could Do Before Node.js, JavaScript lived exclusively in the browser. It could animate elements, handle user interactions, and make API calls. But the moment a request left the browser, JavaScript's role ended. The server was someone else's territory — PHP, Python, Ruby, Java. Node.js changed that entirely. Node.js is a JavaScript runtime built on Chrome's V8 engine. It takes JavaScript out of the browser and lets it run anywhere — on servers, in build tools, in command line interfaces, in desktop applications. For the MERN stack, Node.js is the foundation everything else runs on. Express runs on Node. Your build processes run on Node. Your testing tools run on Node. But the architectural decision that makes Node.js interesting is not just that it runs JavaScript. It is how it handles concurrency. Traditional server runtimes handle multiple simultaneous requests by spawning multiple threads. Each request gets its own thread. This works but threads are expensive. Memory usage grows with traffic. Context switching between threads adds overhead. Node.js uses a single-threaded event loop with non-blocking I/O. When Node receives a request that involves waiting — a database query, an API call, reading a file — it does not block the thread and wait for the result. It registers a callback and moves on to handle the next request. When the result arrives, the callback executes. This means a single Node process can handle thousands of concurrent connections without the overhead of managing thousands of threads. Where this model excels: -> APIs that make many database queries and external service calls -> Real-time applications like chat, live notifications, and collaborative tools -> Applications with high concurrency and I/O-heavy workloads -> Microservices that need to be fast and lightweight Where this model requires care: -> CPU-intensive operations like image processing, video encoding, or complex calculations will block the event loop. These should be offloaded to worker threads or separate services. For most MERN applications — web APIs, real-time features, data-driven dashboards — Node's event-driven model is not a limitation. It is a genuine advantage. The npm ecosystem that comes with Node is the largest package registry in the world. Whatever problem you are solving, there is almost certainly a well-maintained package that has already solved it. Has Node.js replaced a traditional backend language in your stack? What drove that decision? #NodeJS #JavaScript #MERN #BackendDevelopment #WebDevelopment #SoftwareEngineering

Next.js 16 Migration Alert: How to update your Utility Functions for Async Requests 🛠️ If you are upgrading to Next.js 16, your "traditional" utility functions are likely about to break. With Async Request APIs now standardized, params, searchParams, cookies(), and headers() are all Promises. This is a fundamental shift for the React Compiler to optimize rendering. Here is how to refactor your code to stay compliant. 1️⃣ The "Utility Function" Refactor Previously, you could pass params into a helper function and access them immediately. In v16, you must handle the Promise. ❌ Old Way (v14/v15): function getCategory(params) { return params.category; // This will now be undefined or error } ✅ New Way (v16): async function getCategory(params: Promise<{ category: string }>) { const { category } = await params; return category; } 2️⃣ Handling cookies() and headers() These are no longer static snapshots. They are dynamic functions that must be awaited at the point of use to avoid blocking the entire route's execution. ❌ Deprecated: const cookieStore = cookies(); const theme = cookieStore.get('theme'); ✅ Next.js 16 Standard: const cookieStore = await cookies(); const theme = cookieStore.get('theme'); 3️⃣ The Pattern: "Pass-Through" vs. "Awaited" To keep your components clean, decide where you want to resolve the Promise. Option A (In Page): Await the params in the Page component and pass the values down to children. (Best for simple props). Option B (In Component): Pass the Promise down and let the child component use() it or await it. (Best for deep component trees). // app/shop/[id]/page.tsx export default function Page({ params }) { // Pass the promise directly to a Client Component return <ProductDetails params={params} />; } 🚀 Migration Checklist: [ ] Search for all instances of params and searchParams in your Page and Layout files. [ ] Update TypeScript interfaces to use Promise<T>. [ ] Audit your Middleware—if you were doing complex body manipulation, migrate that logic to proxy.ts or Route Handlers. [ ] Ensure every Parallel Route (@folder) has a default.js to prevent 404s during navigation. The Strategy: Don't fight the async nature of Next.js 16. By embracing await, you allow the React Compiler to "hole-punch" your UI—rendering static content instantly while the dynamic parts catch up. How is your team handling the v16 migration? Are you automating the refactor with Codemods, or doing a manual audit? comment 👇 #NextJS16 #ReactJS #WebDevelopment #CodingLife #SoftwareArchitecture #TypeScript #Vercel #Frontend

TypeScript 6.0 Beta is here! 🚀 This is a historic release: it is the final version based on the JavaScript codebase. The team is actively rewriting TS 7.0 in Go for massive native speed gains. TS 6.0 is the bridge to that high-performance future. 🌉 🧠 Smarter Inference Methods that don't use this now get better type inference. TS 6.0 detects if this is unused and prioritizes context from other arguments. This fixes those annoying "implicitly has an 'any' type" errors when method arguments were out of order. 📦 New Subpath Imports Node.js allows subpath imports starting with just #/ (e.g. #/utils). TS 6.0 now supports this under node20, nodenext, and bundler resolution. You can finally use those ultra-clean internal import paths! ✨ 🛠️ Bundler + CommonJS A highly requested combo! You can now use --moduleResolution bundler with --module commonjs. Perfect for projects that still ship CJS but rely on modern bundler resolution logic. A smoother upgrade path away from node10. 🔮 Prep for TS 7.0 (Go) New flag: --stableTypeOrdering This ensures your type IDs match the behavior of the upcoming Go compiler. It guarantees your .d.ts emits stay consistent when you eventually switch to the native engine next major version. 📅 ES2026 & Temporal The long-awaited Temporal API is coming! TS 6.0 adds built-in types for Temporal (fixing Date/Time pain), plus RegExp.escape and Map upsert methods (getOrInsert). Enable via target: es2026 or the lib. 🧹 Spring Cleaning To slim down for the port, TS 6.0 is deprecating old features: ❌ target: es5 is deprecated ❌ no-default-lib is deprecated ⚠️ outFile, amd, and system modules are discouraged. Time to update those configs! 🔒 Stricter Defaults New projects get better safety out of the box. Defaults now include: ✅ strict: true ✅ module: esnext ✅ noUncheckedSideEffectImports: true 👉 Try it today Get your codebase ready for the future: » npm install -D typescript@beta Test it now to ensure you're ready for the migration to the native Go compiler in v7.0!

🚀 Node.js Isn’t Single-Threaded (And Most Developers Still Get This Wrong) When I started learning Node.js, I kept hearing: “Node.js is single-threaded.” That statement is true… but also misleading. After working more deeply with backend systems, I realized something important: 👉 Node.js is single-threaded for JavaScript execution — but not for handling work. Let’s break this down. 1. The JavaScript Thread (Yes, Single-Threaded) Node.js runs JavaScript on a single main thread using the V8 engine. That means: One call stack One task executed at a time No parallel JS execution (unless you use Worker Threads) But then… How does Node handle thousands of requests simultaneously? 2. The Secret: Event Loop + libuv Node.js uses: Event Loop libuv (C++ library) OS-level async capabilities Thread pool (4 threads by default) This is where the magic happens. Example: const fs = require("fs"); console.log("Start"); fs.readFile("file.txt", "utf8", (err, data) => { console.log("File read complete"); }); console.log("End"); Output: Start End File read complete Why? Because fs.readFile() is delegated to libuv, not executed on the main thread. 3. How the Event Loop Actually Works The Event Loop has phases: Timers (setTimeout, setInterval) Pending callbacks Idle/prepare Poll Check (setImmediate) Close callbacks And then there’s: process.nextTick() queue Microtask queue (Promises) Important: 👉 process.nextTick() runs before every phase 👉 Promise microtasks run after each phase This is why understanding event loop order is critical for backend interviews. 4. The Real Danger: Blocking the Event Loop If you do this: while(true) {} You freeze everything. Why? Because the main thread is blocked. No callbacks. No I/O. No requests processed. This is why Node is excellent for: ✅ I/O-heavy apps ❌ CPU-heavy tasks For CPU-intensive work, use: Worker Threads Child Processes Or move heavy work to another service 5. Why Node.js Scales So Well Node doesn’t create a thread per request (like traditional servers). Instead: One event loop Non-blocking I/O Handles thousands of concurrent connections This makes it perfect for: APIs Real-time apps Streaming services Chat systems Final Conclusion Node.js is not “single-threaded” in the way people think. It is: Single-threaded for JavaScript execution Multi-threaded under the hood for I/O handling And that architectural design is what makes it powerful. If you're preparing for backend interviews, truly understanding the event loop is a game-changer. If this helped you, feel free to connect. Let’s grow together #NodeJS #Backend #JavaScript #BackendDev #LearningNodeJS

Modules in Node.js 1.Usage Node.js වල වැඩ කරනකොට Modules කියන concept එක හොඳට තේරුම් ගන්න එක වැදගත්. Modules use කරලා අපිට code එක organized කරන්න, reusable කරන්න, සහ maintainable structure එකක් හදාගන්න පුළුවන්. Module එකක් කියන්නේ functions, variables, objects වගේ code තියෙන file එකක්. ඒවා export කරලා වෙන file වල reuse කරන්න පුළුවන්. 2.Types of Modules in Node.js i. Core Modules (Built-in Modules) මේ modules Node.js එක්කම default එනවා. Install කරන්න ඕන නැහැ. Examples: fs – File System handling http – Create web servers path – Work with file paths os – Operating system details const http = require('http'); http.createServer((req, res) => {  res.write("Hello World");  res.end(); }).listen(3000); ii. Local Modules (User-defined Modules) මේවා අපි project එක ඇතුළේ create කරන custom modules. Example: math.js function add(a, b) {  return a + b; } module.exports = add; app.js const add = require('./math'); console.log(add(5, 3)); iii. Third-party Modules(External Modules) මේවා වෙන developers ලා හදපු modules. npm (Node Package Manager). හරහා install කරගන්න පුළුවන්. Examples: express mongoose first Install express npm install express const express = require('express'); const app = express(); app.listen(3000); 3.Module Systems in Node.js i. CommonJS Uses require() Uses module.exports Default in Node.js ii. ES Modules (ESM) Uses import and export Modern JavaScript standard Keep learning. Keep building. Let’s grow together as developers. #NodeJS #JavaScriptDeveloper #BackendDeveloper #FullStackDeveloper #SoftwareEngineer #WebDeveloper #TechCareers #CareerGrowth #JobSeekers #DeveloperCommunity #OpenToWork #TechIndustry #CodingSkills #LinkedInLearning

I just open-sourced Grit Framework. The idea was simple: Laravel has the best developer experience of any framework. Go has the best performance of any backend language. React has the best frontend ecosystem. Why hasn't anyone combined all three? So I built it. Grit is a full-stack framework that fuses Go (Gin + GORM) with Next.js (React + TypeScript) in a monorepo. One command to scaffold. One command to generate full-stack resources. Batteries included. Here's what ships out of the box: → CLI Scaffolder — grit new myapp gives you a complete monorepo: Go API, Next.js frontend, admin panel, shared types, Docker setup. Ready in seconds. → Full-Stack Code Generation — grit generate resource Invoice creates the Go model, CRUD handler, React Query hooks, Zod schema, and admin page. One command. Both sides wired. → Filament-like Admin Panel — Resource-based admin dashboard with data tables, form builders, charts, widgets, and a dark theme that actually looks good. → End-to-End Type Safety — Go struct tags auto-generate TypeScript types and Zod schemas. Change the backend, run grit sync, frontend stays in sync. → Batteries Included — JWT auth with roles, file storage (S3/R2/MinIO), email via Resend, background jobs, cron, Redis caching, and AI integration. All pre-configured. → GORM Studio — A visual database browser embedded at /studio. Browse, edit, and manage your data without leaving the browser. The setup: go install https://lnkd.in/eXQVnEz9 grit new myapp That's it. You're building. I built this because I was tired of spending the first week of every project wiring together 15 different tools. With Grit, you skip straight to building features. Go's speed. React's ecosystem. Laravel's DX. One framework. 📖 Docs: https://lnkd.in/e9gme798 🔗 GitHub: https://lnkd.in/eQBgh6_W Grit is free, open-source, and ready for production. Try it, break it, and tell me what's missing. Atuhaire Collins, Oketa Fred, NGOBI OWEN ALBERT, Ernest Kabahima, Moses Kisakye, Roland Sankara #golang #react #nextjs #opensource #framework #webdevelopment #developer #fullstack #buildinpublic