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React Js Developer Interview Questions

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538 react js developer interview questions shared by candidates

- How do you make issue queries/mutations to a graphql server - how do you create graphql server ? What things you need ? - What is directive in graphql ? What is Fragment in GraphQL ? - How do you write unit tests for your Queries/Mutation (on server side) - TypeScript basics - Partial in TS - Decorators - union & discriminating unions - What are Generics in TS ? simple example - useCallback vs useMemo - call parent func from child component in React
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Senior Frontend Developer-React JS

Interviewed at Firstsource Solutions

4.1★
Jul 25, 2023

- How do you make issue queries/mutations to a graphql server - how do you create graphql server ? What things you need ? - What is directive in graphql ? What is Fragment in GraphQL ? - How do you write unit tests for your Queries/Mutation (on server side) - TypeScript basics - Partial in TS - Decorators - union & discriminating unions - What are Generics in TS ? simple example - useCallback vs useMemo - call parent func from child component in React

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

4.2★
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.

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