Learning React can feel overwhelming—especially when you move from tutorials to real projects. That's where React Dojo comes in. It's a free, open-source platform built on a simple truth: you learn React by doing, not just reading. Thousands of developers have already used it to level up their skills. Below, we answer your top questions about how it works, what it covers, and how you can start practicing today.
What is React Dojo?
React Dojo is a free learning platform designed to help you master React through hands-on practice. Instead of relying on long tutorials or passive reading, it gives you three things for every concept: a short, clear explanation; an interactive playground where you can edit and run code; and real coding exercises to test your understanding. The philosophy is simple—no hand-holding, no shortcuts. Just you, the code, and immediate feedback. You can access it at react-dojo.vercel.app.
What concepts are covered in React Dojo?
Currently, React Dojo covers 27 concepts, 15 exercises, and 10 quizzes, organized into 6 categories. These include:
- State & Memory: useState, useReducer, useRef, useOptimistic, useActionState
- Synchronization: useEffect, useLayoutEffect, useEffectEvent
- Performance: useMemo, useCallback, memo
- Concurrency: useTransition, useDeferredValue, Suspense, use
- Composition: useContext, createPortal, lazy, useId, useFormStatus
- Interviews: Virtual DOM, HOC, Prop Drilling, Controlled vs Uncontrolled components
Whether you're a beginner or aiming to ace React interviews, you'll find relevant content to sharpen your skills.
What kinds of exercises does React Dojo offer?
Exercises range from basic to advanced, and each one is designed to push you to apply what you've learned—not just copy and paste. Basic exercises include building a Counter, Toggle, Color Picker, or Stopwatch. Intermediate challenges involve a Theme Switcher, Form Validation, or Infinite Scroll. For advanced learners, you'll tackle a Debounced Search, Drag & Drop, or Lazy Modal. The platform gives you a starting code snippet and an interactive playground where you can edit, run, and test your solution immediately. You can also compare your approach with the official solution after completing each exercise.
How do the quizzes work?
React Dojo's quizzes are organized by difficulty: Basic, Intermediate, and Advanced. They cover essential topics like React Hooks, Performance Patterns, Context API, and Component Lifecycle. Each quiz asks multiple-choice or code-based questions that require you to think critically. After answering, you get instant feedback and an explanation. Quizzes are a great way to reinforce what you've practiced in the exercises and identify any gaps in your understanding before moving on.
What is the Custom Hooks library?
One of the most valuable sections is the Custom Hooks library, currently in Beta. It contains 15 community-contributed, reusable hooks organized by category. Each hook includes a description, the full code, and an interactive playground so you can experiment. Categories include:
- State: useLocalStorage, usePrevious, useToggle, useCounter
- DOM: useMediaQuery, useClickOutside, useWindowSize, useHover, useEventListener, useIntersectionObserver, useOnlineStatus
- Async: useFetch
- Utility: useDebounce, useClipboard, useInterval
You can copy the code directly, try it in the playground, and use it in your own projects. The library is also open to contributions—if you've built a useful hook, you can add it to the collection.
What is the Developer Directory?
The Developer Directory is another Beta feature that turns learning into a social experience. You sign in with your GitHub account and join a community of React learners. With this directory, you can track your learning progress, compare your performance with other developers, and earn KYU ranks as you advance through concepts, exercises, and quizzes. It's a motivating way to stay consistent and see how you stack up against peers.
What platform features does React Dojo offer?
React Dojo is designed for a smooth learning experience. It includes keyboard shortcuts for fast navigation, a bilingual interface available in English and Spanish, and a mobile-friendly layout—42% of users access the platform from their phones. You'll also find a built-in search feature to quickly find specific hooks or concepts, and the entire platform is light and fast. Best of all, it's completely free and open-source.