Top ReactJS Interview Questions for Freshers & Experienced (2024)

Get the list of important basic and advanced ReactJS interview questions and answers for jobs (freshers, entry-level, experienced) in IT/Software companies.

ReactJS Interview Questions for Placement in IT & Software Companies (2024)

ReactJS is a JavaScript library developed by Facebook. It is used to create reusable UI components. React official JS documentation by defining it like this:

React is a library for building composable user interfaces and it supports and encourages the creation of reusable user interface components that represent data that changes over time using a declarative syntax.

React is used by most developers as the "V" part of the MVC architecture. React abstracts the DOM away from you, offering a simpler programming model and of course a better experience.

One of the benefits of React is that it can also render on the server using Node. It can power native applications using its framework called React Native. It implements a one-way reactive data flow that reduces boilerplate, making it easier to understand than traditional data binding.

It uses the concept of Virtual Dom, which selectively renders subtrees of nodes as the state changes. It does the least amount of DOM manipulation to keep your components up to date.

Here we have listed some ReactJS technical interview questions that are suitable for both freshers and experienced professionals at any level. These ReactJS interview questions with answers will help candidates pass the technical round interview.

Basic ReactJS Interview Questions and Answers for Freshers

If you are planning to crack any intermediate-level ReactJS technical round interview in the coming days, basic ReactJS interview questions for freshers will be the deciding factor in the entry-level job interview.

In this article, we are trying to provide some of the important beginner-level ReactJS interview questions with answers which are to the point. Here you will get the list of important ReactJS interview questions that will really help you in your placement preparation.

ReactJS Interview Questions and Answers for Experienced Professionals

A skilled ReactJS professional will help the company grow. So, during the hiring process, a company will always try to recruit potential candidates by asking the best ReactJS interview questions to check if the interviewee has advanced ReactJS skills/techniques. Therefore, advanced-level ReactJS technical interview preparation is a process that should be approached carefully.

Here we have listed some advanced-level ReactJS questions for professionals with years experience of working in ReactJS.

How to prepare for ReactJS Interview?

Your success in the ReactJS interview depends on pre-interview preparation. Here are some quick pointers to keep in mind:

• Review the ReactJS job description.
• Consider your eligibility for the job.
• Prepare a list of expected ReactJS interview questions.
• Practice ReactJS mock interviews.

The 5 most common ReactJS Interview Questions

Here are the 5 most popular questions asked in almost any ReactJS interview:

• Q #1) What is ReactJS and its applications?
• Q #2) What are the major features of ReactJS?
• Q #3) What technical certifications do you hold?
• Q #4) What do you do to improve your skills in ReactJS?
• Q #5) What technical websites do you follow?

ReactJS Interview Questions for Freshers and Experienced Professionals

1. What is React?
2. Why React?
3. What is the significance of component architecture?
4. What is state and it significance?
5. How do we pass data to component using props?
6. How to Validatate props using propTypes?
7. How to supply default values to props using defaultProps?
8. How to use map function to iterate on arrays to generate elements?
9. What is event handling in React?
10. How to pass arguments to event handlers?
11. What is the significance to default Value prop?
12. How to use react ref prop to get access to DOM element?
13. What is context?
14. When to use context?
15. How to create context?
16. What is code splitting?
17. Why do you need code splitting?
18. what is route-based code splitting?
19. What are hooks?
20. Why do you need hooks?
21. what are the different types of hooks?
22. How to Set up react router?
23. How to configure route with Route component?
24. How to switch component to define routing rules?
25. How to make routes dynamic using route params?
26. How to use Prompt component to get consent of user for navigation?
27. What is redux?
28. Why redux?
29. How to install and setup redux?
30. Creating actions, reducer and store
31. What is Immutable.js?
32. What is React Redux?
33. Why React Redux?
34. Why redux middleware?
35. What is redux saga?
36. What is the significance of unit testing jargon and tools?
37. What is webpack?
38. Why webpack?
39. How to set up Hot Module Replacement?
40. What is Isomorphic React?
41. What is server-side rendering (SSR)?
42. Why SSR?
43. What is React and why use it?
44. What React means?
45. What is React best for?
46. Why is React better than HTML?
47. Is React frontend or backend?
48. Do I need HTML for React?
49. Is React HTML?
50. Does React generate HTML?
51. Is React a library or framework?
52. Who uses React?
53. Is React harder than JavaScript?
54. Search for: Is React harder than JavaScript?
55. Is React better or Angular?
56. Is React a node framework?
57. Does React use CSS?
58. Is React a server?
59. Can I use JavaScript in React?
60. How is React different from Angular?
61. Is React a technology?
62. Is React and Angular similar?
63. Is Netflix written in React?
64. Does Netflix use React or angular?
65. Why React is famous?
66. What language does React use?
67. Does Amazon use React or Angular?
68. Does Google Use React or Angular?
69. Does Apple use React?
70. What is difference between React and Nodejs?
71. Is React harder than node JS?
72. Which is best React or Nodejs?
73. Why is React so difficult?
74. What is react JS for beginners?
75. What is bootstrap in React?
76. Does React include HTML and CSS?
77. Can we use bootstrap in React?
78. Is next js better than React?
79. How does React work?
80. Who create React?
81. How do you create a website using React?
82. How do you write a script in React?
83. Does React use jQuery?
84. Is React front end or backend?
85. What is difference between React and JavaScript?
86. Is React a web framework?
87. Do I need HTML for React?
88. What is the difference between HTML and React?
89. Why is React so faster than JavaScript?
90. Is React a library or framework?
91. Why is React better than other frameworks?
92. What can you build with React?
93. What is the benefit of using React?
94. Does React generate HTML?
95. Do you need JavaScript for React?
96. Who uses React and Angular?
97. Is React a server?
98. Is React a static website?
99. Does React need a server?
100. Is React full-stack?
101. What is the backend for React JS?
102. Is React harder than JavaScript?
103. Can I use React for websites?
104. Is Netflix written in React?
105. Does Netflix use React or angular?
106. Where React is used?
107. Can I get a job knowing React?
108. Is React relevant in 2024?
109. Does Amazon use React or Angular?
110. Does Google Use React or Angular?
111. Does Apple use React?
112. Who uses React?
113. Why You Should not Use React?
114. Is React a language?
115. What is React and node JS?
116. Is React a technology?
117. Is React widely used?
118. Why is React better for front-end?
119. Is React faster than normal HTML?
120. Does React use CSS?
121. What are the limitations of ReactJS?
122. What is life cycle in React?
123. What are features of React?
124. Is React frontend or backend?
125. How does React work?
126. What is React router for?
127. What is react JS in MVC?
128. What is state and props in React?
129. What is constructor in React?
130. Is React a single-page application?
131. Is React router a framework?
132. What is components in React?
133. What are types in React?
134. How many types of React are there?
135. Why do we need to React?
136. Is next JS better than React?
137. Which Router is best for React?
138. How do I create a website using React?
139. Why React is called SPA?
140. Is React SPA or MPA?
141. What is state in React?
142. What are props in React?
143. What is use of Redux in react JS?
144. What are keys in React?
145. Why we use hooks in React?
146. What are refs in React?
147. What architecture is React?
148. Can I use .NET With React?
149. Why React is better than MVC?
150. Is React router necessary?
151. What is JSX in React?
152. Does React need HTML?
153. Is React a framework or library?
154. What is bootstrap in React?
155. Why React is better than HTML?
156. Is React harder than JavaScript?
157. Why is React so famous?
158. What can you build with React?
159. Is React better or Angular?
160. Which is better Reactjs or Node JS?
161. Can you use HTML with React?
162. Is ReactJS outdated?
163. Is React still popular 2024?
164. Is Netflix written in React?
165. Does Netflix use React or angular?
166. Is Facebook built on React?

Common Topics to Consider for ReactJS Interview

• React Communication Between Components interview questions.
• React Components interview questions.
• React Forms and User Input interview questions.
• React Higher Order Components interview questions.
• React keys interview questions.
• React basic webpack and babel environment interview questions.
• React Server-Side Rendering (SSR) interview questions.
• React JSX interview questions.
• React Performance interview questions.
• React AJAX call interview questions.
• React Boilerplate [React + Babel + Webpack] interview questions.
• React Component Lifecycle interview questions.
• React Forms interview questions.
• React Routing interview questions.
• React Tools interview questions.
• React with Redux interview questions.
• React, Webpack & Typescript installation interview questions.
• React.createClass vs extends React.Component interview questions.
• React with Flow interview questions.
• ReactJS in Flux way interview questions.
• ReactJS with jQuery interview questions.
• ReactJS with Typescript interview questions.

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