Optimize NodeJS Apps with Promise.all()

I recently worked on a project where I had to optimize the performance of a Next.js application It was a real challenge, and I made a mistake that cost me hours of debugging I was trying to implement a complex UI pattern using React But I forgot to memoize a component, causing it to re-render unnecessarily As I was debugging, I had a realization that I should have used the React DevTools to identify the issue earlier This would have saved me a lot of time and frustration A practical takeaway from this experience is to always use the React DevTools to identify performance bottlenecks It's a simple yet effective way to optimize the performance of your React applications What's the most common mistake you've made when optimizing the performance of a React application #NextJs #React #PerformanceOptimization #FrontendEngineering #UIPatterns #ReactDevTools #JavaScript #WebDevelopment #OptimizationTechniques

Most React devs bring their SPA habits into Next.js — and their users pay the price. 👇 You've written it a hundred times: useState for data, useEffect to fetch it, a spinner while they wait. It works in React. In Next.js App Router, it's the wrong pattern entirely. Server Components let you fetch data inside the component — on the server, before the page hits the browser. No loading state. No extra JS bundle. No hydration issues. HTML that arrives ready. I've swapped dozens of useEffect fetch patterns for async Server Components and the Lighthouse scores jump immediately. Use the server for reads. Use useEffect for things only the browser can do. #NextJS #ReactJS #WebDevelopment #JavaScript #TypeScript #AppRouter #ServerComponents #ReactHooks #FrontendDeveloper #SoftwareEngineer #CleanCode #100DaysOfCode #WebPerformance #Programming #WebDev #NextJS14 #FullStackDeveloper #CodeQuality

This small React mistake can break your entire app 👇 Many developers write code like this: if (condition) return null; useEffect(() => { // logic }, []); Looks fine, right? ❌ But it can cause a serious error. 💥 Error: "Rendered fewer hooks than expected" 🔍 Why this happens React has a strict rule: 👉 Hooks must be called in the same order on every render 📌 What actually happens: • 1st render → early return → useEffect NOT called • 2nd render → useEffect called 👉 Hook order mismatch = 💣 error ✅ Fix Always call hooks first, then apply conditions: useEffect(() => { // logic }, []); if (condition) return null; 💡 Rule to remember: Never call hooks conditionally. Keep them at the top level. Have you ever faced this error before? 👇 #react #nextjs #javascript #webdevelopment #frontend

I think this is a common mistake among beginners. If you're a beginner and want to avoid this, it's better to use ESLint or Biome. I recommend using Biome it's faster, and the default settings are actually pretty good 🤩

This shows that the JavaScript dependencies of an R/Shiny app can be automatically inserted on the client side when necessary. No need to ask the package users to do it. 😇 #rstats #shiny #javascript

most React developers use useCallback wrong. not because they don't understand it. because they were taught the wrong rule. the rule they heard: "wrap functions in useCallback to prevent unnecessary re-renders. the actual rule: useCallback only helps when you pass that function to a child component wrapped in React.memo or as a dependency in useEffect. that's it. useCallback doesn't prevent re-renders of the parent. it just memoizes the function reference so children don't see a "new" function every render. three questions to ask before reaching for useCallback: - is this function passed to a memoized child component? - is this function a dependency in a useEffect? - is this function expensive to recreate? if none of these just write the function normally. the best optimisation is usually the one you don't add. #reactjs #typescript #webdevelopment #buildinpublic #javascript

Stop losing your app data on page refresh! 🔄 This breakdown of Persistent State in React covers the "Why" and the "How," including a clean custom hook using localStorage. Perfect for creating a more seamless user experience. #ReactJS #WebDevelopment #Frontend #CodingTips #JavaScript

🚀 Why React Server Components Are Changing Modern Web Development If you're building React apps in 2026, one concept you should definitely know is React Server Components (RSC). 💡 What are Server Components? React Server Components allow certain components to render directly on the server instead of the browser. This means users receive ready-to-use HTML faster, reducing the amount of JavaScript sent to the client. 💬 Have you tried React Server Components yet? What do you think about them? #React #WebDevelopment #Frontend #NextJS #JavaScript #Programming #SoftwareDevelopment #ReactJS #TechTrends

React devs — this is why you’re running out of API limits. Most React beginners make this mistake with useEffect.... And it looks completely harmless. 𝗧𝗵𝗲𝘆 𝘄𝗿𝗶𝘁𝗲 𝘁𝗵𝗶𝘀: useEffect(() => {   fetchData() }) No dependency array. 𝗧𝗵𝗲 𝗽𝗿𝗼𝗯𝗹𝗲𝗺 𝗶𝘀, This runs after EVERY render. Not once. Not on mount. 𝗘𝗩𝗘𝗥𝗬 render. If your effect updates state: it triggers a re-render, which re-runs the effects causing infinite API calls. That's when your app breaks. 𝗧𝗵𝗲 𝗳𝗶𝘅 𝗶𝘀 𝘀𝗶𝗺𝗽𝗹𝗲: useEffect(() => {   fetchData() }, [])  // empty array = runs once on mount 𝗛𝗲𝗿𝗲'𝘀 𝘄𝗵𝗲𝗻 𝗲𝗮𝗰𝗵 𝘃𝗲𝗿𝘀𝗶𝗼𝗻 𝗿𝘂𝗻𝘀: → No array   = runs after every render → Empty array  = runs once on mount → [value]    = runs when value changes Save this — you 𝗪𝗜𝗟𝗟 hit this bug again. Which useEffect mistake have you  made before? Drop it below 👇 Follow for more React tips that save  you hours of debugging. #reactjs #webdevelopment #javascript #MERN

Most Developers Misuse React JS… Here’s How to Fix It At the beginning, everything feels smooth. But as your app grows, things start breaking, slowing down, and becoming hard to maintain. Here are some common mistakes I’ve seen in real projects 👇 🔴 Mistakes to Avoid: - Prop drilling across multiple components - No proper folder structure - Overusing useState everywhere - Writing business logic inside UI components - Ignoring performance optimization 🟢 Best Practices to Follow: - Use Context API or Redux for state management - Maintain a clean folder structure (components / hooks / services / utils) - Create reusable custom hooks - Keep components small and focused - Optimize with React.memo, useMemo, useCallback 💡 Pro Tip: React is powerful, but without proper structure, it quickly becomes a messy UI jungle. 💬 Let’s discuss: What’s the biggest React mistake you’ve faced in your project? #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #CleanCode #ReactHooks #Redux #SoftwareDevelopment