React test for interview: free practice with answers
What a React screening round looks like, five sample questions in the same style, and the full free test with every answer explained.
What the real round usually looks like
Most React interview tests are ten to twenty multiple-choice questions, sometimes followed by a short practical task. The pass mark is 80%, and this skill is commonly screened for front-end developer, React developer and junior full-stack roles. Requirements vary by employer, so treat the benchmark as a floor.
Try the sample
React: 5 interview-style questions
5 questions · instant feedbackHow to prepare in three days
- Take the full test once to find the gap.
- Read the lesson that matches the gap and retake the next day.
- Read the React interview questions aloud so you can explain your score.
Common questions
Do I need to know class components?
Most new code uses function components and hooks, and the questions here do too. Knowing that older class code exists helps when maintaining an existing project, but it is not the focus.
Is Redux or another state library tested?
Not on this page. The questions cover built-in React state, because you need to understand it before any library makes sense.
Why does my effect run twice in development?
In development Strict Mode, React mounts, unmounts and mounts components again to reveal missing cleanup. It does not happen in a production build, so the fix is a proper cleanup function, not removing Strict Mode.
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