React Form Bugs: Controlled vs Uncontrolled Components

🚀 Today I Learned: Different Ways to Handle Forms in React Today I explored multiple ways to handle forms in React, and it helped me understand the difference between Controlled and Uncontrolled Components. 🔹 Controlled Components In this approach, form data is handled by React state. Every input change updates the state using onChange, which makes React the single source of truth. ✅ Better control over form data ✅ Easy validation and dynamic behavior 🔹 Uncontrolled Components Here, form data is handled by the DOM itself instead of React state. We usually use refs to access the input values when needed. ✅ Less code for simple forms ✅ Useful when you don't need real-time state updates 💡 Learning both approaches made me realize that choosing the right method depends on the complexity of the form and the level of control needed. Every day I dive deeper into React fundamentals, and understanding concepts like these makes building real applications much easier. #React #WebDevelopment #JavaScript #FrontendDevelopment #LearningInPublic

Most React developers use this pattern every day: setCount(prev => prev + 1) But very few can clearly explain why it’s necessary. In React, state updates are not immediate. They can be batched and executed later, which means the value you’re using (count) might already be outdated when the update actually runs. The functional update avoids this problem. Instead of relying on a potentially stale value, it receives the latest state at the exact moment React processes the update. So instead of saying: “set the value to this” you’re saying: “update based on whatever the current value is” That’s the key difference. This pattern isn’t just syntax, it’s how you avoid subtle bugs when your next state depends on the previous one. #React #JavaScript #Frontend #WebDevelopment #SoftwareEngineering

## What actually happens when you call an API in React? They call an API… and don’t realize it’s running multiple times. I made the same mistake. At first, I thought: “Just fetch data inside the component and display it.” But React doesn’t work like that. Every time your component re-renders, your API call can run again. And again. And again. That means: • Unnecessary network requests • Slower performance • Confusing bugs The fix? useEffect(). It controls when your API runs — not just how. Here’s the actual flow: Component renders useEffect triggers API call is made Data returns State updates Component re-renders (once, correctly) My biggest realization: React isn’t just about writing code — It’s about understanding the lifecycle behind it. If you ignore that, small mistakes become big problems. #reactjs #javascript #webdevelopment

Today I learned an important concept in React about the useState hook. Some key points that helped me understand it better: setState (or the set function) does three things: It updates the state value. It triggers the component to re-render. React batches multiple updates together for better performance. Another interesting thing is that if the previous value is equal to the new value, React does not re-render the component. Understanding how state updates and batching work helps in writing more efficient React components. Devendra Dhote Ritik Rajput Dhanesh Parwati Malviya Sarthak Sharma #React #JavaScript #WebDevelopment #FrontendDevelopment

⚛️ React Internals — Understanding the RSC Payload & React Flight Protocol When using React Server Components (RSC) in frameworks like Next.js, React doesn't send fully rendered HTML or large JavaScript bundles to the browser. Instead, React sends a special serialized data stream called the RSC Payload. This payload is generated using the React Flight Protocol. What is the React Flight Protocol? The React Flight Protocol is the format React uses to transmit Server Component results from the server to the browser. Instead of sending HTML, React sends structured instructions describing the component tree. Example payload: ["$","div",null,{  "children":[   ["$","h1",null,{"children":"Product Name"}],   ["$","$L2c",null,{"id":123,"qty":1}]  ] }] Here: • div → root element • h1 → server rendered element • $L2c → client component reference • { id:123, qty:1 } → props passed to the client component #React #ReactJS #NextJS #ReactServerComponents #JavaScript #FrontendDevelopment #WebDevelopment #SoftwareEngineering #ReactDeveloper #FullStackDeveloper #ModernReact #CodingCommunity #DevCommunity #LearnInPublic #TechEducation

Another core concept in React is props, short for “properties.” Props are how data moves from one component to another. Think of them as inputs you pass into a component so it can display or use that data. For example, you might have a reusable component that displays a user card. Instead of hardcoding the name or email inside the component, you pass that information in as props. The component stays flexible, and you can reuse it in different places with different data. This pattern is what makes React applications easier to organize. Small components receive data through props, render what they need, and stay focused on a single job. Once you start thinking in terms of components passing data through props, building larger interfaces becomes much more manageable. #reactjs #webdevelopment #frontenddevelopment #javascript #softwaredevelopment

A common React issue that can silently hurt performance ⚠️ While working on a React application, I came across a case where an API was being called multiple times without any clear reason. At first glance, everything looked fine. The component logic was simple and the API integration was correct. But after debugging, the root cause turned out to be related to useEffect. The effect was running on every render because the dependency array was not properly managed. Once the dependencies were corrected, the API calls were reduced to exactly when they were needed. This kind of issue is easy to miss, but it can lead to: 🔹 Unnecessary API load 🔹 Performance degradation 🔹 Unexpected UI behavior In React, always be intentional with your useEffect dependencies. Small oversights can lead to bigger performance problems. #reactjs #frontenddevelopment #javascript #webdevelopment #performance

A lot of developers get confused between controlled and uncontrolled inputs in React — the difference is small, but it changes everything. 🔹 Controlled Inputs Here, React controls the input using state (useState). Every change goes through React, which makes validation, real-time updates, and data handling much easier. 🔹 Uncontrolled Inputs Here, the DOM manages the input state. You access the value using useRef only when needed, which can be useful in simpler or less interactive scenarios. 📌 The difference is just about who controls the data — React or the DOM. But this small difference impacts how you handle validation, performance, and overall form behavior in real-world applications. Understanding this properly makes form handling much more predictable and scalable. #ReactJS #FrontendDevelopment #JavaScript #MERNStack #SoftwareDevelopment #WebDevelopment #FullStackDeveloper #LearningInPublic #CodingJourney #DevelopersLife

⚛️ A Small React Technique That Can Improve Performance – Debouncing While building a React search feature, I noticed something interesting. Every time a user typed a letter, the application was making an API request immediately. That means if someone typed “React”, the API was called *5 times*. This is where *debouncing* becomes very useful. 💡 Debouncing delays the function execution until the user *stops typing for a short time*. This helps to: ⚡ Reduce unnecessary API calls 🚀 Improve application performance 😊 Provide a smoother user experience Small optimizations like this make a *big difference in real-world applications*. Sometimes improving performance is not about writing more code — it’s about writing *smarter code*. #ReactJS #JavaScript #FrontendDeveloper #WebDevelopment #Performance

🚀 Just Built a React Password Generator! I recently built a sleek and dynamic Password Generator using React to strengthen my understanding of core React Hooks and front-end performance optimization. In this project, I worked with: useState – State management useEffect – Handling side effects useCallback – Performance optimization useRef – Direct DOM access (copy to clipboard feature) The application allows users to: • Generate secure random passwords • Customize length • Include/exclude numbers & symbols • Copy passwords instantly This project helped me better understand component re-renders, optimization techniques, and writing cleaner, more efficient React code. 🔗 GitHub Repository: https://lnkd.in/dGE4dfAu Live Demo (Vercel): https://lnkd.in/dJsb59bV I’m continuously building and improving my React & full-stack development skills. Feedback is always welcome! #React #WebDevelopment #FrontendDevelopment #JavaScript #MERN #LearningInPublic