Introduction

React.js is powerful, but beginners often make mistakes that slow their learning and project growth.
This guide by Diffcozen highlights the most common React mistakes and how to avoid them.

Common React Mistakes

1. Mutating State Directly

Always use setState or useState setter functions to update state.

2. Ignoring Key Props in Lists

Keys are essential for rendering lists efficiently.

3. Forgetting Cleanup in useEffect

Always clean up subscriptions or timers to prevent memory leaks.

4. Overusing Class Components

Use functional components with hooks for cleaner and modern code.

5. Poor Project Structure

Organize components, hooks, and assets properly for scalability.

Tips to Avoid Mistakes

• Follow official React best practices
• Break components into smaller, reusable parts
• Write clear and readable code
• Test components frequently

Conclusion

Avoiding these mistakes will help you build scalable, maintainable, and bug-free React applications.
At Diffcozen, we teach React with best practices in mind for long-term success.