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Top 40 ReactJS Interview Questions and Answers for 2025
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ReactJS has become a cornerstone of modern web development, with its component-based architecture and efficient rendering making it a go-to choice for building dynamic user interfaces.
Whether you’re a seasoned developer looking to brush up on your skills or a job seeker preparing for an upcoming reactjs interview, this guide will provide valuable insights into the key concepts and best practices in ReactJS development.
Let’s dive in and explore the essential topics that will help you ace your ReactJS interviews in 2025.
Level -1: Basic
1. What is ReatcJS and How does it Work?
2. What is the difference between Shadow DOM and Virtual DOM? Explain the reconciliation process.
3. What is the difference between an Element and a Component?
4. What is state and props in reactjs?
5. What are Pure Components and React.memo()?
6. What are synthetic events in React?
7. What are the different phases of the component lifecycle?
8. What are Higher-Order Components?
9. What is context and useContext Hook?