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Interview prep
React interview questions from fresher to senior level: JSX, props and state, hooks, effects, performance, and React 19 features like Actions, useActionState and Server Components, each with an explanation.
Start where you are; each paper is 12 questions with a timer and a topic-by-topic report.
Fresher0–1 year
12 React interview questions for freshers and students (0 to 1 year): JSX, props, useState, conditional rendering, controlled inputs, effects and Fragments. Each answer explains why the other options are wrong.
Mid-level2–5 years
12 React interview questions for developers with some experience (2 to 5 years): useMemo, StrictMode effects, context re-renders, React.memo, useReducer, error boundaries and keys. Each answer explains why the other options are wrong.
Senior5+ years
12 React interview questions for senior and lead developers (5+ years): Server Components, useActionState, useOptimistic, the React Compiler, hydration, transitions and virtualisation. Each answer explains why the other options are wrong.
Most technical rounds include a coding task. Write JavaScript or Python, run it against tests in your browser, then read a full solution.
Browse coding problemsReact interviews check whether you understand how rendering works, not just the API. Expect questions on when components re-render, how state updates, and, for senior roles, React 19's Actions and Server Components.
useState, controlled inputs, effects and lifting state up.useReducer, refs, keys, error boundaries and rendering strategies.useActionState, useOptimistic, the React Compiler, hydration, transitions and large lists.Build a small app as you go and break it on purpose: mutate state, drop a dependency, render a random number on the server. Seeing the bug yourself is the fastest way to explain it in an interview.