React Developer Interview Questions

3,046 react developer interview questions shared by candidates

Technical Round: Find missing number in array Difference between let and var Javascript Event loop Remove all negative numbers from array React Lifecycle methods React advantages React hooks, useEffect functionality CSS positions HTML Doctype Semantic tags Inline and Block elements flexbox properties JavaScript Promises Prototypes React Virtual DOM
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React Developer

Interviewed at SquareBoat

4
Oct 5, 2021

Technical Round: Find missing number in array Difference between let and var Javascript Event loop Remove all negative numbers from array React Lifecycle methods React advantages React hooks, useEffect functionality CSS positions HTML Doctype Semantic tags Inline and Block elements flexbox properties JavaScript Promises Prototypes React Virtual DOM

What is react native? What is redux? What are the threads? What is vue js? Explain the process for firebase integration for authentication? Explain the process for publishing react native app on app store? What is state and props? What you used for writing a specific platform code?
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React Native Developer

Interviewed at Nimap infotech

3.3
Apr 12, 2021

What is react native? What is redux? What are the threads? What is vue js? Explain the process for firebase integration for authentication? Explain the process for publishing react native app on app store? What is state and props? What you used for writing a specific platform code?

1. What are controlled and uncontrolled components in React? 2. Explain the purpose of useEffect and how it handles side effects 3. What is the difference between useState and useReducer 4. How would you optimize the performance of a React application 5. What is the difference between React Redux and Redux toolkit 6. How would you implement user authentication in a React application 7. And some questions related to the projects that i have done for my previous company
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React Developer

Interviewed at Times World Information Technology

3.9
Jul 11, 2025

1. What are controlled and uncontrolled components in React? 2. Explain the purpose of useEffect and how it handles side effects 3. What is the difference between useState and useReducer 4. How would you optimize the performance of a React application 5. What is the difference between React Redux and Redux toolkit 6. How would you implement user authentication in a React application 7. And some questions related to the projects that i have done for my previous company

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