ReactJS Performance Issues: Avoiding a Hot Mess

React Strict Mode shows problems you didn’t know you shipped React Strict Mode doesn’t exist to annoy developers. It exists to expose code that only appears correct. When we enabled Strict Mode, things that “worked fine” suddenly started breaking: APIs were called twice effects behaved unpredictably cleanup logic revealed hidden bugs At first glance, it feels like React is doing something wrong. But what it’s really doing is removing your safety net. Strict Mode forces you to write code that: has no side effects during render cleans up effects correctly doesn’t rely on execution order luck What surprised me most was this: the issues it exposed weren’t development-only problems. They were production bugs waiting for the right conditions. If code survives Strict Mode, it’s usually safe for: concurrent rendering Suspense future React changes Disabling Strict Mode doesn’t make your app safer. It just hides the weak spots. #react #frontend #javascript #webengineering #softwarearchitecture #srinudesetti

Code works, but then it doesn't. It's like trying to drive a car with the parking brake on - it's gonna move, but it's gonna be a struggle. You write ReactJS code, and at first, everything seems fine. But over time, you start to notice some major issues - latency, bugs, and a general feeling of lost confidence. I mean, who hasn't been there, right? You make a small change, and suddenly it takes days to implement, not hours. So, what's going on here? It's not like React is inherently bad or anything. The problem usually lies in some common mistakes we make when writing ReactJS code. For instance - re-rendering without control, that's like a never-ending loop of frustration. Or, no debouncing or throttling, which is like trying to drink from a firehose. And then there's poor state management, no theming or single source of truth, API calls scattered everywhere... it's like a coding nightmare. Oh, and let's not forget a file structure that does not scale - that's just a recipe for disaster. It's broken. But here's the thing: you can avoid these mistakes. Learn from them, and you'll be golden. Most frontend failures aren't really "performance issues or React problems" - they're engineering maturity problems. It's like, we need to take a step back, look at our code, and think, "Is this really the best way to do this?" So, take a deep breath, and let's dive into this. It's not about being perfect; it's about being better. And, if you want to learn more, check out this article: https://lnkd.in/gCYWkbQy #ReactJS #FrontendDevelopment #CodingBestPractices

There’s a phase almost every React developer goes through. You learn about useMemo and useCallback… and suddenly you want to wrap everything in them just to be safe. I’ve been there 😅 But here’s the truth: more hooks don’t automatically mean better performance. These hooks exist to solve specific problems like unnecessary recalculations and avoidable re-renders not to decorate every component. In this post, I break down when useMemo and useCallback actually help, when they don’t, and how to think about performance the right way. Because great React code isn’t about using every hook… it’s about using the right ones, at the right time. 👇 Swipe through and optimize with intention. #React #JavaScript #FrontendDevelopment #WebDev #ReactHooks #Performance #BuildInPublic

So, ReactJS has this thing called the React Hook pattern. It's a game-changer. You don't need to store every single state - just the ones that can't be calculated from others. This is key: avoid redundant state. It's all about simplifying your code, making it more efficient. For instance, let's say you're dealing with user data - you've got a first name, a last name, and you want to display the full name. You can store the first and last names as separate states, no problem. Then, you just combine them to get the full name - easy peasy. It's like building with Legos, you only need to keep track of the individual pieces, not every single combination. This pattern is all about reducing unnecessary states, making your code more streamlined. And the best part? It's officially recommended, so you know it's a solid strategy. Check it out: https://lnkd.in/g2QYWT8e #ReactJS #StateManagement #CodingEfficiency

I spent two hours today chasing a "Circular Dependency" error that would never have happened in Next.js. In Next.js, if Service A needs a function from Service B, you just import it. Done. In NestJS, I tried to do the same thing: AuthService needed the UserService to find a user. UserService needed the AuthService to hash a password. In a standard React/Next environment, this feels like a Tuesday. In NestJS, the Dependency Injection (DI) container basically threw its hands up and gave me a Circular dependency between modules error (or worse, a silent undefined provider). How I fixed it: I had to use forwardRef(). It feels like a hack when you first see it, but it’s how Nest tells the DI container: "Hey, don't try to resolve this immediately; wait until both are ready." @Inject(forwardRef(() => AuthService)) private authService: AuthService The real lesson? The error wasn't the code—it was my architectural mindset. NestJS isn't just a "backend version of Next." It’s a framework that forces you to think about your dependency graph. If you have services leaning on each other that hard, you probably need to extract that shared logic into a third "helper" service. Next.js lets you be fast and a little messy. NestJS forces you to be organized, even when you’re just trying to get a login feature working. Anyone else had to wrestle with forwardRef() or did you just refactor your way out of it? #backend #nestjs #nextjs #typescript #codingtips #webdevelopment

🚀 Hidden React Fact #2 – React Doesn’t Re-render the DOM Most developers believe: 👉 “When state changes, React re-renders the DOM” That’s not exactly true ❌ 💡 My key learning: When state changes, React re-runs your component function — not the DOM. Yes, your component function executes again. But the real DOM only updates if something actually changed. 🧠 What really happens under the hood? • Component function is re-executed • A new Virtual DOM snapshot is created • React runs its diffing algorithm • Only the minimal required DOM updates are applied 🔥 Why this matters more than you think: • Re-render ≠ DOM update • Components can run many times without touching the DOM • Heavy logic inside components hurts performance • This is why memo, useMemo, and useCallback exist This single distinction completely changed how I think about React performance. 📌 Sharing my learnings while digging deeper into React • Next.js • TypeScript #ReactJS #ReactInternals #HiddenFacts #FrontendEngineering #JavaScript #NextJS #TypeScript #WebDevelopment #LearnInPublic #DeveloperJourney #ReactLearning

🚀 Day 2 of sharing daily dev learnings Today’s topic: useCallback in React ⚛️ Common mistake: Using useCallback everywhere without understanding why. Problem I faced: Child components were re-rendering even when props looked unchanged. Reason: Functions are re-created on every render. Fix: Wrapped callback functions with useCallback. Example: const handleClick = useCallback(() => { setCount(prev => prev + 1) }, []) Result: ✅ Fewer unnecessary re-renders ✅ Better performance ✅ More predictable behavior Lesson: useCallback is useful when: • Passing functions to memoized child components • Preventing re-renders caused by function references Don’t overuse it. Use it with intent. Do you use useCallback regularly or only when needed? 👇 #ReactJS #JavaScript #Frontend #WebDev #ReactHooks

Building a Scalable Node.js/Express.js Folder Structure That Won't Drive You Crazy 🚀 I've been building Node.js backends for years now, and if there's one thing I've learned the hard way, it's this: your folder structure matters way more than you think it does. When you're starting a new Express project, it's tempting to throw everything into a few files and call it a day. But six months later, when you're hunting for that one middleware in a 3000-line index.js file at 2 AM, you'll wish you'd spent those extra 20 minutes organizing things properly. Let me share the folder structure that's saved my sanity on multiple monolithic Node.js projects. 👇 The Real Win: The point isn't to follow this structure religiously it's to have a system. When you know exactly where each piece of code belongs, you spend less time thinking about organization and more time building features. When to Break the Rules: This is overkill for a 3-endpoint API. Use your judgment. For huge apps, consider organizing by feature/domain instead of by type. But for most monolithic Node.js backends? This structure just works. Take the extra hour upfront to set up a proper structure, and you'll save dozens of hours down the road. Happy coding! 🚀 #NodeJS #ExpressJS #WebDevelopment #JavaScript #BackendDevelopment #SoftwareEngineering #CleanCode

Day 2 Deep Dive into React Build Process ⚛️ After 3 years of Vue.js, I decided that my React journey shouldn't just be about writing code, but about understanding how it works under the hood. Today, I focused on the Build Process and how our code actually reaches the browser. Key takeaways from today: ✅ The "Kitchen" (Build Tools): I learned how Vite and Webpack work as bundlers to collect all our files and prepare them for the browser. ✅ The Translator (Babel): Understood how JSX is translated into standard JavaScript that any browser can read. ✅ React Scripts: Explored how this "Maestro" manages everything behind the scenes so we don't have to manually add <script> tags in HTML. ✅ The Final Result: How everything we write is bundled into simple JS files and injected into the index.html. As a Software Engineer, I believe that understanding these "Engineering" details is what makes the difference. It's not just about tools; it's about the logic! Excited for Day 3! 🔥 #ReactJS #SoftwareEngineering #Frontend #WebDevelopment #JavaScript #Vite #LearningJourney #Day2

🚀 New Project: Building a Simple Todo-List with React & TypeScript I'm really excited to share my latest project—a sleek and functional task management (To-Do list)app. This project helped me sharpen my skills in building robust frontend architectures. Key highlights: ✅ TypeScript: Implemented for better type safety and code reliability. ✅ SCSS: Managed styling with variables and nesting for a professional look. ✅ LocalStorage: Integrated to ensure user data persists across browser sessions. 🔗 Live Demo: [https://lnkd.in/dTzb3j2T] 📂 Source Code: [https://lnkd.in/dsaXBtsv] I’d like to hear your feedback! #ReactJS #TypeScript #WebDevelopment #Frontend #Coding #Sass