Fixing useEffect in React: API Calls and Side Effects

Most React tutorials show basic folder structures—but real-world projects need something more scalable. Here’s the approach I follow to keep my projects clean and production-ready: 🔹 I separate logic by features, not just files 🔹 Keep components reusable and independent 🔹 Move all API logic into services (no messy calls inside components) 🔹 Use custom hooks to simplify complex logic 🔹 Maintain global state with Context or Redux only when needed 🔹 Keep utilities and helpers isolated for better reuse 💡 The goal is simple: Write code today that’s easy to scale tomorrow. As projects grow, structure becomes more important than syntax. What’s your approach—feature-based or file-based structure? 👇 #ReactJS #FrontendDevelopment #MERNStack #CleanCode #WebDevelopment #Javascript #NextJS #fblifestyle #IT #Structure #FullStack

useEffect is probably the most powerful - and most misused - hook in React. 🎯 Arun explained it really well, sharing this because I've made  these exact mistakes in real projects: → Forgetting the cleanup function - memory leaks in production 😅 → Wrong dependency array - stale data showing up in dashboards → Fetching data inside useEffect - unnecessary re-renders and   race conditions What changed for me: ✅ Always write cleanup for subscriptions and event listeners ✅ Use React Query for data fetching — avoids most useEffect complexity ✅ Think twice before adding objects/arrays as dependencies 2.5 years of React and useEffect still teaches me something new. What's your most common useEffect mistake? Drop it below 👇 #ReactJS #Frontend #JavaScript #WebDevelopment #FrontendDeveloper

Most React tutorials show basic folder structures—but real-world projects need something more scalable. Here’s the approach I follow to keep my projects clean and production-ready: 🔹 I separate logic by features, not just files 🔹 Keep components reusable and independent 🔹 Move all API logic into services (no messy calls inside components) 🔹 Use custom hooks to simplify complex logic 🔹 Maintain global state with Context or Redux only when needed 🔹 Keep utilities and helpers isolated for better reuse 💡 The goal is simple: Write code today that’s easy to scale tomorrow. As projects grow, structure becomes more important than syntax. What’s your approach—feature-based or file-based structure? 👇 #ReactJS #FrontendDevelopment #MERNStack #CleanCode #WebDevelopment #Javascript

⚛️ React Components Explained In React, everything is built using components. There are two types: • Functional Components – simple, modern, and use Hooks • Class Components – older, more complex, and less used today 👉 Today, developers prefer Functional Components for clean and scalable code. Are you using functional components in your projects? #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #Coding

💡 #JavaScript Global vs Local Variables (Simple Explanation) If you're learning JavaScript, understanding variable scope is a must 👇 🔹 Global Variables Declared outside any function Accessible from anywhere in your code Can be used across multiple functions Example: var name = "Avi"; function greet() { console.log(name); // Accessible here } 🔹 Local Variables Declared inside a function or block Accessible only within that function/block Helps avoid unwanted changes from outside Example: function greet() { var message = "Hello"; console.log(message); // Works here } console.log(message); // ❌ Error ⚡ Key Difference Global = accessible everywhere Local = accessible only inside its scope 👉 Tip: Prefer #local variables to keep your code clean and avoid bugs. Use #global where multiple parts of your app need the same value. #frontend #js #javascript

Can you cancel a Promise in JavaScript? Short answer: No — but you can cancel the work behind it. A Promise is just a result container, not the async operation itself. Once created, it will resolve or reject — you can’t “stop” it directly. What you can do instead: • Use AbortController → cancels APIs like fetch • Use cancellation flags/tokens → for custom async logic • Clear timers → if work is scheduled (setTimeout) • Ignore results → soft cancel pattern Real-world takeaway: Design your async code to be cancel-aware, not Promise-dependent. This is exactly how modern tools like React Query handle requests under the hood. #JavaScript #Frontend #AsyncProgramming #WebDevelopment #ReactJS #CleanCode

Most React tutorials show basic folder structures—but real-world projects need something more scalable. Here’s the approach I follow to keep my projects clean and production-ready: 🔹 I separate logic by features, not just files 🔹 Keep components reusable and independent 🔹 Move all API logic into services (no messy calls inside components) 🔹 Use custom hooks to simplify complex logic 🔹 Maintain global state with Context or Redux only when needed 🔹 Keep utilities and helpers isolated for better reuse 💡 The goal is simple: Write code today that’s easy to scale tomorrow. As projects grow, structure becomes more important than syntax. What’s your approach—feature-based or file-based structure? 👇 Follow me - Abhishek Anand 😍 #share #like #repost #ReactJS #FrontendDevelopment #MERNStack #CleanCode #WebDevelopment #Javascript Credit #jamesCodeLab

JavaScript is single-threaded. But somehow it handles API calls, timers, promises, user clicks, and UI updates—all at the same time. That magic is called the Event Loop. Many frontend bugs are not caused by React. They happen because developers don’t fully understand how JavaScript handles async operations. Example: Promise callbacks run before setTimeout callbacks. That’s why this: console.log("Start"); setTimeout(() => console.log("Timeout"), 0); Promise.resolve().then(() => console.log("Promise")); console.log("End"); Output: Start End Promise Timeout Why? Because Promises go to the Microtask Queue, which gets priority over the Macrotask Queue like setTimeout. Understanding this helps with: ✔ Avoiding race conditions ✔ Writing better async code ✔ Debugging production issues faster ✔ Improving frontend performance ✔ Understanding React behavior better The Event Loop is not just an interview topic. It explains how your entire frontend application actually works. Master this once, and debugging becomes much easier. #JavaScript #EventLoop #FrontendDevelopment #ReactJS #WebDevelopment #AsyncJavaScript #Programming #SoftwareEngineering

"JavaScript is single-threaded… but still handles async tasks?" 🤯 This is where the Event Loop comes in 🔥 Let’s understand it simply 👇 🔹 JavaScript is single-threaded It can do one task at a time using the Call Stack. 🔹 So how does async work? Thanks to: - Web APIs 🌐 - Callback Queue 📥 - Event Loop 🔁 💻 Example: console.log("Start"); setTimeout(() => { console.log("Async Task"); }, 0); console.log("End"); 👉 Output: Start End Async Task 🔹 Why this happens? - "setTimeout" goes to Web APIs - Then moves to Callback Queue - Event Loop waits for Call Stack to be empty - Then executes it 🚀 Pro Tip: Even "setTimeout(..., 0)" is NOT immediate. 💬 Did this surprise you the first time you learned it? 😄 #javascript #webdevelopment #mern #coding #developers

most developers don't know the difference between null , undefined and "" and it's breaking their React forms silently. - always initialise string state with ' ' not undefined - always initialise array state with [ ] not undefined - always initialise object state with { } not undefined here's why it matters beyond the warning: - undefined means "this was never set" - null means "this was intentionally set to nothing" - ' ' means "this exists but is currently empty" React treats these three things completely differently when rendering. your form works locally because you fill it in immediately. it breaks in production because someone submits without touching a field. initialise your state properly. #reactjs #typescript #webdevelopment #buildinpublic #javascript