How to avoid the infinite loop trap in React's useEffect

Your component renders fast in isolation, but in the app... it stutters? Been there. I was recently debugging a laggy table in a React app. Thought it was the data size or some heavy computation. Turned out the real issue? Unnecessary re-renders. 🔍 Even with only a few rows, toggling a filter caused the *entire table* (and worse, surrounding components) to re-render. Why? Because I passed a new inline function and object props each time. And React, being React, re-renders when it *thinks* things changed. The fix was surgical, but powerful: 1. Wrapped the row component in `React.memo` 2. Memoized props with `useMemo` and `useCallback` 3. Tracked what *actually* changed using the React DevTools Profiler #ReactJS #WebPerformance #ReactTips #Frontend #JavaScript #DevLife #Optimization #TechShare

🏎️ Ready for React 19.2 Good news: useS (use-s-react) is now fully compatible with React 19 and its new compiler! If you want to try it yourself, follow these simple steps 👇 1️⃣ Create your project with Vite: npm create vite@latest 2️⃣ Install use-s-react: npm i use-s-react 3️⃣ Open App.tsx and replace useState with useS. Import the hook, run the dev server — and that’s it! The default Vite counter keeps working flawlessly. 💡 Take It Further Create a global counter with persistence in localStorage in just a few lines: const [count, setCount] = useS({  value: 0,  key: "global-counter",  persist: true, }); Go back to the browser, and you’ll see the counter keeps its value after reload, stored under the key "global-counter" 🔁 Are you ready to try it out? 👉 https://lnkd.in/eucfrDwp #React19 #ReactHooks #useS #StateManagement #WebDevelopment #OpenSource #Frontend

If you're still using useEffect + useState for every API call, React Query will change your life. 🔥 Why I use React Query in React + Next.js projects ✔️ Cleaner API logic ✔️ No more manual loading/error states ✔️ Built-in caching & refetching ✔️ Works great with Next.js App Router ✔️ Less repeated code, more performance React Query is a must-learn for modern React apps. 🚀

If you’ve ever seen your React app re-render endlessly, it’s not a ghost. It’s probably your useEffect. 😅 Here’s what’s really happening useEffect runs every time something inside its dependency array changes. So if you put too many things there, it keeps re-running forever. If you leave something out, your effect won’t update when it should. Think of it like this: “React re-runs the effect whenever any ingredient in your recipe changes.” So, only list what your effect actually uses. Example: useEffect(() => { fetchData(query); }, [query]); If you add data or setData to that list, you’ll create an endless loop. Why? Because setData changes data, which triggers the effect again. And again. And again. 💀 It’s not React’s fault, it’s just doing what you told it to do. Once you truly get how dependencies work, useEffect stops being scary and starts feeling powerful. Be honest, how long did it take you to finally understand useEffect? #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #SoftwareEngineering #Coding #ReactTips #DeveloperLife

⚡ Express.js Tip — Speed up your site instantly! Performance isn’t just about writing fast code — it’s about sending responses efficiently. Two quick wins for every Express app 👇 🚀 compression() — compresses responses to make payloads smaller. 📦 express.static() with maxAge — caches static assets in the browser. These two lines can significantly boost your app’s performance, especially for users on slow connections. Make it fast. Make it smooth. 💨 #NodeJS #ExpressJS #Performance #WebDev #JavaScript #CodingTips

Ever stared at a React component that re-renders for no reason, tanking your app's performance? I spent hours debugging a sluggish dashboard this week. The profiler was lighting up, but the cause wasn't obvious. It turned out to be an anonymous function passed as a prop, like `onClick={() => handleUpdate()}`. 🤦♂️ This creates a new function instance on 𝐞𝐯𝐞𝐫𝐲 𝐬𝐢𝐧𝐠𝐥𝐞 𝐫𝐞𝐧𝐝𝐞𝐫, which breaks `React.memo` and other optimizations because the prop is always "new." It's such a simple thing, but it can cause a cascade of unnecessary updates. ⚡ Moving the handler outside the JSX or wrapping it in `useCallback` is the key to stabilizing the component's props. What’s your favorite way to fix this? #ReactJS #WebPerformance #FrontendDevelopment

The latest update from the React team is here! ⚛️ They've just released React 19 Beta, and it's packed with exciting new features that'll change the way you build apps. Server Components are now stable, making it easier to render components on the server for faster page loads. Actions are also introduced, simplifying data mutations and reducing the need for useEffect. Another game-changer is the useOptimistic hook, which helps manage optimistic UI updates, making your app feel more responsive. These updates are a big deal for full-stack devs like us, as they'll streamline our workflow and improve app performance. What are your thoughts on the React 19 Beta update? Are you excited to try out the new features? 🤔 #React19 #FullStackDevelopment #WebDevelopment #JavaScript #ReactJS

Ever see a React component re-render for no apparent reason, killing your app's performance? I spent hours debugging a sluggish dashboard. The profiler was lighting up like crazy, but the props weren't changing. Turns out, I was passing an inline function directly to a child component: `<Button onClick={() => doSomething()} />`. This creates a 𝐧𝐞𝐰 𝐟𝐮𝐧𝐜𝐭𝐢𝐨𝐧 𝐨𝐧 𝐞𝐯𝐞𝐫𝐲 𝐬𝐢𝐧𝐠𝐥𝐞 𝐫𝐞𝐧𝐝𝐞𝐫. 🤦♂️ React sees a new prop and dutifully re-renders the component, even if nothing has visually changed. It's such a subtle bug but can have a massive impact. 💡 The fix is simple: define your functions outside the JSX or wrap them in `useCallback`. What’s your favorite way to fix this? #ReactJS #FrontendDevelopment #WebPerformance

Redux vs Zustand: When I first started managing state in React Native, Redux was my go-to. It was powerful, popular, and everyone around me seemed to use it. But as my projects grew, I started asking myself: “Why does toggling a simple value need so much setup?” Reducers, action types, dispatch... it all started to feel heavy — especially for small or medium apps. Then I discovered Zustand, and everything just clicked. ✅ No context. ✅ No reducers. ✅ Just a few lines of code — clean, predictable, and efficient. Zustand plays beautifully with TypeScript and scales effortlessly as the app grows. These days, it’s my go-to for local state management — no boilerplate, no extra headaches. #ReactNative #Redux #Zustand #StateManagement #MobileDevelopment #JavaScript #ReactJS #Android #lOS