Top 30 React Interview Questions for Freshers (2026 Guide with Answers)

By Sandeep -

Meta Description: Prepare for your React interview with these top 30 React interview questions and answers for freshers. Covers basics, hooks, components, and more.

Keywords: React interview questions, React questions for freshers, React JS interview questions 2026, frontend interview questions, React hooks questions

🚀 Introduction

React is one of the most popular JavaScript libraries for building user interfaces. If you're preparing for a frontend or full-stack developer role, mastering React interview questions is essential.

In this post, we cover the top 30 React interview questions for freshers, along with simple explanations.

📌 Top 30 React Interview Questions and Answers

1. What is React?

React is a JavaScript library used for building user interfaces, especially single-page applications.

2. What are the features of React?

  • Virtual DOM
  • Component-based architecture
  • JSX
  • One-way data binding

3. What is JSX?

JSX stands for JavaScript XML. It allows writing HTML inside JavaScript.

4. What is Virtual DOM?

Virtual DOM is a lightweight copy of the real DOM that improves performance.

5. What are components in React?

Components are reusable pieces of UI.

6. What is the difference between functional and class components?

Functional components use hooks, while class components use lifecycle methods.

7. What are props?

Props are inputs passed to components.

8. What is state in React?

State is used to manage dynamic data in a component.

9. What is useState hook?

useState is a hook used to manage state in functional components.

10. What is useEffect hook?

useEffect is used to handle side effects like API calls.

11. What is a key in React?

Keys help React identify which items have changed in a list.

12. What is conditional rendering?

Rendering components based on conditions.

13. What is React Router?

React Router is used for navigation between pages.

14. What is Redux?

Redux is a state management library.

15. What is lifting state up?

Moving state to a common parent component.

16. What are controlled components?

Form elements controlled by React state.

17. What are uncontrolled components?

Form elements handled by the DOM.

18. What is a hook?

Hooks allow using state and lifecycle features in functional components.

19. What is useContext?

Used to share data globally without props.

20. What is useRef?

Used to access DOM elements directly.

21. What is React Fragment?

Allows grouping elements without extra DOM nodes.

22. What is prop drilling?

Passing props through multiple levels.

23. What is memoization?

Optimizing performance by caching results.

24. What is React.memo?

Prevents unnecessary re-renders.

25. What is lazy loading?

Loading components only when needed.

26. What is Suspense?

Used with lazy loading.

27. What is reconciliation?

Process of updating the DOM.

28. What is server-side rendering?

Rendering React on the server.

29. What is StrictMode?

Tool for highlighting potential problems.

30. What are React Hooks rules?

  • Only call hooks at top level
  • Only call hooks in React functions

🎯 Conclusion

These React interview questions will help you crack frontend interviews easily. Practice them regularly and build small projects for better understanding.

❓ FAQs

Q1: Is React easy to learn?

Yes, especially if you know JavaScript basics.

Q2: How to prepare for React interviews?

Practice projects, revise hooks, and solve interview questions.

Q3: Are React hooks important?

Yes, they are frequently asked in interviews.

🔗 Internal Linking

👉 Next Post: React Intermediate Interview Questions (Post 2)

📢 Tags

React Interview Questions, React JS, Frontend Developer, JavaScript, Web Development, Interview Preparation

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