Learn Web Development | Day 71: State Management UseState with TypeScript in Next.js

Description

Master State Management in Next.js and React using useState with TypeScript in this full, beginner-friendly and intermediate-friendly tutorial. This video answers the most-searched questions about how to correctly type your state, avoid TypeScript errors, and manage data using strings, numbers, booleans, arrays, and objects. Whether you're building dashboards, forms, counters, product pages, or complex UI components, this tutorial will help you understand how useState works with TypeScript, how to define state types, and how to prevent bugs before they happen. 🔍 Topics Covered What is state management in React and Next.js? Why TypeScript makes state safer and more predictable How to use useState with string, number, boolean, array, and object types How to fix common TypeScript errors in useState The difference between explicit and inferred types When to type useState manually How useState works under the hood Best practices for typing state in real projects ❓ Frequently Asked Questions (with Answers) Q: What is state management in React or Next.js? A: State management is how your application stores and updates dynamic values such as user input, toggles, counters, and API data. With useState, React automatically re-renders your UI when the state changes. Q: Why use TypeScript with useState? A: TypeScript prevents invalid values from entering your state, reducing bugs and making your code safer, more predictable, and easier to maintain. Q: Do I need to type every useState declaration manually? A: No. TypeScript can infer many types automatically, but for arrays, objects, and complex data, it’s better to type your state explicitly. Q: How do I use useState with objects in TypeScript? A: You define an interface or type for your object, then pass it inside useState as a generic. This video shows the full practical example. Q: What is the best way to manage many states? A: Start with useState, then move to useReducer or external state libraries when your project grows. Q: Why does TypeScript show errors when I update state? A: Usually because your state type doesn't match the new value. This tutorial shows how to fix common mistakes. Timestamps 0:00 - What is State Management in React and TypeScript 0:41 - Understanding useState with TypeScript in Next.js 2:14 - How to use useState with TypeScript for string values 25:08 - How to use useState with TypeScript for number values 40:41 - How to use useState with TypeScript for boolean toggles 1:00:55 - How to type arrays in useState and avoid common errors 1:29:10 - How to type objects in useState using interfaces and types Hashtags #LearnWebDevelopment #Nextjs #React #ReactJS #TypeScript #UseState #StateManagement #ReactState #NextjsTutorial #TypeScriptTutorial #WebDevelopment #FrontendDevelopment #CodingTutorial #ReactForBeginners #NextjsForBeginners #JavaScript #Programming #WebDevSeries #VSCode