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3,484 react interview questions shared by candidates

They asked several React and frontend questions, including: * What React features or tools do you use? * What is the difference between navigate and useNavigate? * What is the difference between React Router v6 and v5? * Can you explain TypeScript generics? * What is useTransition? * What is RTK Query? * What is staleTime? * What is useLayoutEffect? * How do you safely convert or narrow a fixed value into a specific TypeScript union type?
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React Developer

Interviewed at Capgemini

4.2★
Jun 15, 2026

They asked several React and frontend questions, including: * What React features or tools do you use? * What is the difference between navigate and useNavigate? * What is the difference between React Router v6 and v5? * Can you explain TypeScript generics? * What is useTransition? * What is RTK Query? * What is staleTime? * What is useLayoutEffect? * How do you safely convert or narrow a fixed value into a specific TypeScript union type?

Given a list of currencies and their values from an API, create a currency exchange calculator that allows users to input an amount in one currency and convert it to another currency based on real-time exchange rates.
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React Native Developer

Interviewed at Persistent Systems

4.2★
Feb 17, 2025

Given a list of currencies and their values from an API, create a currency exchange calculator that allows users to input an amount in one currency and convert it to another currency based on real-time exchange rates.

- 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

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