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3,484 react interview questions shared by candidates

React & JS 1. Given 1 URL that data need to render in table format, while coding ask few question what is hook, useState, useEffect, debug the code analysis the styling and change it. 2. Closure, Hoisting in js 3. Let say you are CEO if huge E-commerce application as a CEO what kind of this you want to see when you have only 10 minutes to see. 4. LinkedList, Stack, Queue Java 1. HashMap working internal, Linked HashMap vs HashMap. 2. Design LLD for Parking Lot 3. Advantage of Spring Bean over manual creation of bean. 4. Give some situation and ask what kind of Data structure you use.
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Full Stack Engineer - Java and React JS

Interviewed at Apple

4.1★
Jun 7, 2025

React & JS 1. Given 1 URL that data need to render in table format, while coding ask few question what is hook, useState, useEffect, debug the code analysis the styling and change it. 2. Closure, Hoisting in js 3. Let say you are CEO if huge E-commerce application as a CEO what kind of this you want to see when you have only 10 minutes to see. 4. LinkedList, Stack, Queue Java 1. HashMap working internal, Linked HashMap vs HashMap. 2. Design LLD for Parking Lot 3. Advantage of Spring Bean over manual creation of bean. 4. Give some situation and ask what kind of Data structure you use.

Straightly , he asked write 2 components for parent & Child and pass data from child to component. I will give you string = abbcccdddd, find the number of occurances of a,b,c,d uniquely. what is webpack? what is web workers? Do you know graphQl? what is difference between position fixed and sticky? What is box model?
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Senior React Developer

Interviewed at Tech Mahindra

3.4★
May 23, 2024

Straightly , he asked write 2 components for parent & Child and pass data from child to component. I will give you string = abbcccdddd, find the number of occurances of a,b,c,d uniquely. what is webpack? what is web workers? Do you know graphQl? what is difference between position fixed and sticky? What is box model?

In the frontend interview, the security-focused case questions failed to clearly define the expected level or context of the approach (implementation, architectural, or theoretical), which resulted in an unclear and inconsistent evaluation.
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React Developer

Interviewed at Mphasis

3.4★
Dec 22, 2025

In the frontend interview, the security-focused case questions failed to clearly define the expected level or context of the approach (implementation, architectural, or theoretical), which resulted in an unclear and inconsistent evaluation.

Q: Given user input and database as array. Return the elements which needs to be updated or removed from the database array. For example: userInput=[1,2,3] database=[2,3] Program should return { insertOrUpdate: [1,2,3], remove: [2,3]}
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Senior Software Engineer (React)

Interviewed at Delivery Hero

3.5★
Jan 19, 2021

Q: Given user input and database as array. Return the elements which needs to be updated or removed from the database array. For example: userInput=[1,2,3] database=[2,3] Program should return { insertOrUpdate: [1,2,3], remove: [2,3]}

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