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React Js Developer Interview Questions

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540 react js developer interview questions shared by candidates

Diff btwn functional and class based component, how can we replicate lifecycle method in functional , component, js questions like closure, hoisting, let var, const , coding question to remove duplicates from given , also asked me to create a react form with validation , intrview duration 45 mins .
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React Js Developer

Interviewed at Cognizant

3.6★
Mar 22, 2025

Diff btwn functional and class based component, how can we replicate lifecycle method in functional , component, js questions like closure, hoisting, let var, const , coding question to remove duplicates from given , also asked me to create a react form with validation , intrview duration 45 mins .

1st Technical Interview involved questions on JavaScript, ES6 features, Reat.js, Redux, HTML, CSS, GIT, Text editors. 2nd Technical Interview involved questions basically about the current role & responsibilities, questions on React.js (scenario-based)
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Software Engineer - React JS

Interviewed at Entrata India

4.1★
Mar 22, 2021

1st Technical Interview involved questions on JavaScript, ES6 features, Reat.js, Redux, HTML, CSS, GIT, Text editors. 2nd Technical Interview involved questions basically about the current role & responsibilities, questions on React.js (scenario-based)

te preguntan sobre Owasp, cómo mejorar el performance de una app en React, sobre preprocesadores, virtual dom, npm, redux, ceremonias de Scrum. Mi entrevistador fue muy cálido y abierto a la conversación. En estos momentos estoy en la empresa pero hay mucha incertidumbre, está despidiendo personas en bench, hicieron contrataciones desmesuradas.
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Software Engineer - React JS

Interviewed at EPAM Systems

4★
Sep 15, 2022

te preguntan sobre Owasp, cómo mejorar el performance de una app en React, sobre preprocesadores, virtual dom, npm, redux, ceremonias de Scrum. Mi entrevistador fue muy cálido y abierto a la conversación. En estos momentos estoy en la empresa pero hay mucha incertidumbre, está despidiendo personas en bench, hicieron contrataciones desmesuradas.

Tech Round 1 Interview started with brief discussion. then tech question was realted to javasctipt: 1. setTimeout consoles 2. tricky javascript hoisting question 3. async await code review type scenario 4. program of brackets problems 5. some trasformation of technology discussion I was just wondering there was no question on React concepts.
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React JS Developer Experienced

Interviewed at TO THE NEW

3.7★
Oct 3, 2021

Tech Round 1 Interview started with brief discussion. then tech question was realted to javasctipt: 1. setTimeout consoles 2. tricky javascript hoisting question 3. async await code review type scenario 4. program of brackets problems 5. some trasformation of technology discussion I was just wondering there was no question on React concepts.

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