React JS Interview Playbook: Most-Asked Questions, Live Coding, & Debugging

React JS continues to dominate the frontend development world. If you are aspiring to enter this field, you must prepare well for your interview with the most frequently asked React JS interview questions. An interviewer might ask you different questions based on your experience level and other factors. 

The vastness of the React JS ecosystem might make you feel overwhelmed about how to prepare for your interview. This is why you must read this blog to know about the most commonly asked React JS interview questions. These questions will help you learn about the latest interview trends in the field and prepare efficiently. 

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Commonly Asked React JS Interview Questions

React developer interview questions can be categorised as follows.

React 2026 Interview Questions for Freshers

Freshers must prepare the basics thoroughly for their interview. React JS hooks interview questions are the most common ones for freshers. However, you might also get asked React component interview questions. 

Below are some frequently asked React 2026 interview questions for freshers. 

What is React and its features?

React is an open-source, frontend JavaScript library. It is used for developing user interfaces. React is especially used for developing applications with a single page. It helps in creating reusable User Interface components for applications. The most significant features of this JavaScript library include: 

• Supports server-side rendering
• Follows unidirectional data binding or data flow
• Uses virtual DOM 
• Uses composable or reusable UI components

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What are the limitations of React?

A few limitations of React include:

• It is only a library and not a full-blown framework. 
• It has numerous components, requiring time to understand the benefits of all. 
• Beginner programmers need time to understand React. 
• Coding might become complex due to React, as it uses JSX and inline templating. 

What are the keys in React?

A key in React refers to a special string attribute. It is required when using lists of elements. 

What are the key advantages of React?

Although there are several benefits of React, the most important ones include:

• Virtual DOM is used to enhance efficiency
• SEO friendly
• Reusable components
• Gentle learning curve
• Huge library ecosystem

What are React hooks?

Hooks are functions in React that allow you to ‘hook into’ lifecycle and state features in React from a functional component. These cannot be used in class components, and they let you write components without a class. 

React JS Interview Questions for Experienced

A React frontend interview for an experienced professional is quite different from one for a fresher. It involves questions of higher complexity, for example, React state interview questions. Some frequently asked questions that experienced React developers must know for their interview in 2026 are as follows. 

Explain Conditional Rendering in React.

Conditional rendering is the dynamic output of user interface markup. This output is based on a conditional state, and it works the same as JavaScript conditions. Conditional rendering makes it possible to toggle certain application functions. It also allows displaying high elements, API data rendering, authentication handling, and determining permission levels. 

What is a React Router?

React Router refers to the standard library that is used for routing. It allows you to build single-page web applications in React without refreshing the page during user navigation. The router also allows changing the browser URL. It keeps the user interface in sync with the URL. The React router uses the component structure to call the components, using which appropriate information can be displayed. 

What are the differences between React Hooks and Classes?

React hooks are used in functional components, whereas classes are used in class-based components. The useState functionality makes it easy to use the React hooks, whereas no functionality is available to help access the state. 

Name the different phases of the component lifecycle. 

The lifecycle of React components has four different phases. It starts with Initialisation, during which the React component prepares for the upcoming tough journey by setting up the initial state and default props. Mounting is another phase that puts the elements into the browser DOM. 

Next is updating, where a component updates during a change in the state or props of a component. Unmounting is the last phase in which the component gets removed or unmounted from the DOM. 

What are Higher Order Components?

A Higher Order Component is a function in React. It takes in a component as an input to form and gives a new component as output. 

Live Coding and Debugging React Developer Interview 

Coding challenges play a crucial role in addition to the important React JS interview questions. Your interviewer might give you one of the following challenges to test your practical knowledge. 

• Toggle switch implementation
• Counter component creation
• To-do list building
• Search bar creation
• Fetching data from an API
• Carousel component building
• Modal component creation
• Dropdown menu creation
• Tabs component implementation
• Real-time search filter creation
• Star rating component implementation
• Virtualised list implementation
• Multi-step form building
• Custom hook creation
• Countdown timer creation
• Reusable form component creation with validation
• Dynamic form implementation with Field Arrays
• To-Do list building with Drag- and- Drop
• Context API implementation for Global state
• Formik Implementation with Yup Validation Conclusion

Use the right methods for these challenges and practice well before your interview. Also, always remember that the interviewer does not simply need you to complete the challenge. They also assess your method and time management. 

Conclusion

The React JS interview questions answered in this blog are just to give you an idea to frame your responses. You must use your knowledge and experience to add or alter these answers. Also, if you wish to build a career in frontend development, you must pursue a suitable course to gain the right knowledge and skills. 

It is where you will come across a Bachelor of Computer Applications course by Amity University Online. This program is just what you need to learn frameworks like React and upskill yourself for the industry.