React
Prepare for React interviews with our curated collection of questions designed to test your knowledge across all difficulty levels and experience ranges.
50
Total Questions
26
Easy Questions
24
Medium Questions
0
Hard Questions
13
Avg. Per Level
Experience Level Breakdown
Fresher (0 years)
50
questions
1-3 years
50
questions
3-5 years
50
questions
5+ years
0
questions
Interview Questions
Showing 50 of 50 questions
| Question | Difficulty | Action |
|---|---|---|
What is React and why is it used? Basics | Easy | |
What is JSX and how does it work? Basics | Easy | |
What are components in React? Components | Easy | |
What are props in React? Props | Easy | |
What is state in React and how is it different from props? State Management | Easy | |
What is the useState hook? Hooks | Easy | |
What is the useEffect hook? Hooks | Easy | |
How do you handle events in React? Events | Easy | |
What is conditional rendering in React? Rendering | Easy | |
How do you render lists in React? Lists | Easy | |
What is the difference between controlled and uncontrolled components? Forms | Medium | |
What are keys in lists and why are they important? Lists | Easy | |
How do you pass data between components? Data Flow | Easy | |
What are React fragments and when do you use them? Components | Easy | |
What are React hooks? Hooks | Easy | |
What is the useRef hook? Hooks | Medium | |
How do you handle forms in React? Forms | Easy | |
What is the component lifecycle? Lifecycle | Easy | |
What is React.memo and when should you use it? Performance | Medium | |
What is Context API and how do you use it? State Management | Medium | |
What is prop drilling and how do you solve it? State Management | Medium | |
What is a custom hook? Hooks | Medium | |
How do you optimize React applications? Performance | Medium | |
What are PropTypes and how do you use them? Type Checking | Medium | |
What is React Router and how do you use it? Routing | Medium | |
What is the difference between useEffect and useLayoutEffect? Hooks | Medium | |
How do you handle errors in React? Error Handling | Medium | |
What is the difference between state and props? Fundamentals | Easy | |
How do you import and use external libraries in React? Dependencies | Easy | |
What is a side effect and what are examples? Concepts | Easy | |
What is the virtual DOM? Internals | Medium | |
What are React Developer Tools? Tools | Easy | |
How do you test React components? Testing | Medium | |
What is lazy loading and code splitting? Performance | Medium | |
What is the difference between uncontrolled and controlled forms? Forms | Medium | |
What is the Fragment component and when to use it? Components | Easy | |
How do you handle async data fetching in React? Async | Medium | |
What are higher-order components (HOC)? Advanced Patterns | Medium | |
What is TypeScript and why use it in React? TypeScript | Medium | |
What is the React DevTools Profiler? Tools | Medium | |
How do you pass functions as props in React? Props | Easy | |
What is the dependency array in useEffect? Hooks | Medium | |
How do you create reusable components? Best Practices | Medium | |
What is destructuring and how is it used in React? JavaScript | Easy | |
How do you manage state in larger applications? State Management | Medium | |
What is the spread operator (...) and how is it used in React? JavaScript | Easy | |
How do you handle keyboard events in React? Events | Easy | |
What is defaultProps and when to use it? Props | Easy | |
How do you create a modal in React? Components | Medium | |
What is the useCallback hook and when to use it? Hooks | Medium |
šÆ Interview Preparation Tips
- 1.
Start with Easy level questions to build confidence and understand fundamental concepts.
- 2.
Progress to Medium questions once you're comfortable with the basics.
- 3.
Hard questions are for senior positions or if you want to stand out from other candidates.
- 4.
Filter by your current experience level to focus on relevant questions.
- 5.
Don't just memorize - understand the concepts and be able to explain them clearly.