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Frontend Software Engineer Interview Questions

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8,927 frontend software engineer interview questions shared by candidates

He started the interview with asking questions from my resume, what i worked on, how I used Lighthouse, what did I make there, how did I made the impact I showed in my resume. Then he started with the questions. He asked me what are primitive types and list them all, difference between == and ===, how do I work with immutable states, what is event.preventDefault(), how to clone objects, difference between deep and shallow, difference between JSON.parse(JSON.stringify()) and structuredClone(), use of stopPropogation(), what typecasts into what when we write '5' == 5 . Finally he asked me to make a todolist with react components, the catch was to build UI and functional components seperately.
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Frontend Developer

Interviewed at Securonix

3.9★
Aug 19, 2025

He started the interview with asking questions from my resume, what i worked on, how I used Lighthouse, what did I make there, how did I made the impact I showed in my resume. Then he started with the questions. He asked me what are primitive types and list them all, difference between == and ===, how do I work with immutable states, what is event.preventDefault(), how to clone objects, difference between deep and shallow, difference between JSON.parse(JSON.stringify()) and structuredClone(), use of stopPropogation(), what typecasts into what when we write '5' == 5 . Finally he asked me to make a todolist with react components, the catch was to build UI and functional components seperately.

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