Upgrade from useEffect to React Query for seamless data fetching

Performance becomes critical as applications start handling more data and user interactions. Optimizing both frontend rendering and backend response time can significantly improve user experience. Things I usually focus on: • Avoiding unnecessary re-renders • Lazy loading and code splitting • Debouncing API calls • Pagination and infinite scrolling • Query optimization and indexing • Caching frequently used data Performance improvements don’t always require big changes — small optimizations add up. ⚡ #Performance #WebDevelopment #FullStackDeveloper #Optimization #JavaScript

The TanStack Query loading trap you should avoid Ever seen a loading spinner that never stops when you're offline? This usually happens when you rely only on isPending. What’s happening behind the scenes: - First load (no cache) + user goes offline - Query gets paused, not failed: isPending = true, fetchStatus = 'paused' - UI keeps showing a spinner Problem: Checking only isPending results in the user being stuck on a loader with no explanation. Solution 1: Check both isPending and fetchStatus. This allows you to show a specific "Offline" message instead of a generic spinner. Solution 2: Control network behavior by updating global config: networkMode: 'always' This forces queries to run even when offline (no pause state) It is a small detail, but handling these edge cases makes a huge difference in providing a polished user experience. Thanks to JavaScript Mastery, Hitesh Choudhary, RoadsideCoder.com, Traversy Media, freeCodeCamp for sharing such valuable content for Frontend production-grade applications. #TanStackQuery #ReactQuery #WebDevelopment #Frontend #JavaScript #ReactJS

I think that when a project has a well-structured architecture and uses a state manager, it usually prevents the need to move useQuery into a custom hook. However, this information might still be useful in some cases - will be happy to share

I removed over 300 lines of useEffect and useState from a codebase last year. I replaced all of it with TanStack Query. Before TanStack Query, I was manually managing loading states, error states, caching, and refetching logic in every single component. It worked. But it was messy, repetitive, and broke in unexpected ways. Here is what TanStack Query actually changes: 1. It treats server state and client state as two separate things Most bugs in React apps come from mixing the two. TanStack Query forces a clean separation. 2. Caching is built in and smart by default No more calling the same API three times on the same page because three components need the same data. 3. Background refetching keeps your UI fresh without extra code Your data stays current without you writing a single polling function. 4. The devtools alone will change how you debug async logic Seeing exactly what is cached, stale, or fetching in real time is genuinely useful. 5. It works with any framework now, not just React TanStack Query v5 supports Vue, Solid, and Angular. That is why the rename makes complete sense. The mindset shift: Data fetching is not a UI problem. Once you treat it as its own layer with its own lifecycle, your components become dramatically simpler. ⚡ Are you still managing server state manually or have you made the switch to TanStack Query? Drop your experience below. 👇 If this helped, I would love to hear your experience. #ReactJS #TanStackQuery #Frontend #WebDevelopment #JavaScript

I noticed I was repeating the same API logic in multiple React components. useEffect, useState, loading state, error handling… again and again. It worked, but it didn’t feel right. So I tried moving that logic into a custom hook. Example: function useUserData() {  const [data, setData] = useState(null);  const [loading, setLoading] = useState(true);  useEffect(() => {   fetch('/api/user')    .then(res => res.json())    .then(data => {     setData(data);     setLoading(false);    });  }, []); return { data, loading }; } Now I can reuse it anywhere: const { data, loading } = useUserData(); -No repeated logic. -Cleaner components. -Easier to maintain. Still learning, but custom hooks made my code feel much more structured. #reactjs #webdevelopment #frontend #javascript

Day 12: useEffect Hook in React If useState handles data, then useEffect handles side effects. Understanding this hook is key to building real-world React applications. 📌 What is useEffect? useEffect is a React Hook used to perform side effects in functional components. Side effects include: • API calls • Fetching data • Updating the DOM • Setting up subscriptions • Timers (setInterval, setTimeout) 📌 Basic Syntax useEffect(() => { // side effect code }, [dependencies]); 📌 Example: Run on Component Mount import { useEffect } from "react"; function App() { useEffect(() => { console.log("Component Mounted"); }, []); return <h1>Hello React</h1>; } 👉 Empty dependency array [] means it runs only once (like componentDidMount). 📌 Example: Run on State Change import { useState, useEffect } from "react"; function Counter() { const [count, setCount] = useState(0); useEffect(() => { console.log("Count changed:", count); }, [count]); return ( <button onClick={() => setCount(count + 1)}> {count} </button> ); } 👉 Runs every time count changes. 📌 Cleanup Function (Very Important) useEffect(() => { const interval = setInterval(() => { console.log("Running..."); }, 1000); return () => clearInterval(interval); }, []); 👉 Prevents memory leaks by cleaning up effects. 📌 Why useEffect is powerful ✅ Handles API calls ✅ Syncs UI with data ✅ Manages lifecycle in functional components ✅ Keeps code clean and organized #ReactJS #useEffect #FrontendDevelopment #JavaScript #WebDevelopment #CodingJourney

Working with APIs in React can get messy when you rely on useEffect and useState for everything. Handling loading states, errors, and caching manually takes extra effort and can quickly become hard to manage. React Query simplifies this by managing data fetching and state in a much cleaner and more structured way. 💡 In this slide deck, I covered: 1️⃣ How useQuery works for fetching data 2️⃣ useMutation for POST, PUT, and DELETE requests 3️⃣ Built in loading and error states 4️⃣ Caching, refetching, and configuration options 5️⃣ Setting up QueryClientProvider If you are working with APIs in React, this is definitely something worth learning. ✨ #ReactJS #ReactQuery #JavaScript #FrontendDevelopment #WebDevelopment  #APIIntegration #StateManagement #TanStack #SoftwareDevelopment

Topic: Lifting State Up – The Secret to Syncing Components 🔼 Lifting State Up – The Secret to Syncing React Components Ever had two components that need the same data but their states go out of sync? 🤯 That’s where Lifting State Up saves you. 🔹 The Problem Two sibling components manage their own state → inconsistent UI. 🔹 The Solution Move the shared state to their closest common parent. const [value, setValue] = useState(""); Now the parent controls the data and passes it down as props 👇 ✔ Single source of truth ✔ Consistent UI ✔ Easier debugging 🔹 Real-World Example Search bar + Filter panel Both need the same query → keep state in parent. 💡 Golden Rule If multiple components need the same data, that state shouldn’t live in just one of them. 📌 React works best with unidirectional data flow. 📸 Daily React tips & visuals: 👉 https://lnkd.in/g7QgUPWX 💬 When did lifting state up finally “click” for you? 👍 Like | 🔁 Repost | 💭 Comment #React #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #ReactTips #DeveloperLife

⚛️ React Performance Tip: Stop Recomputing on Every Render A common mistake in React is recalculating data on every render: ```javascript id="s7dh2k" const processedData = data.map(...); ``` ❌ This runs every time the component re-renders ❌ Leads to unnecessary computation and slower UI Instead, memoize it using `useMemo`: ```javascript id="k39xdl" const processedData = useMemo(() => { return data.map(...); }, [data]); ``` ✅ Runs only when `data` changes ✅ Prevents unnecessary recalculations ✅ Improves performance significantly 💡 Key takeaway: Use `useMemo` when: • Expensive computations • Large datasets • Avoiding repeated work 🚀 Small optimization = big performance boost What’s your go-to React performance trick? #ReactJS #JavaScript #Frontend #Performance #WebDevelopment #Coding