Are you looking for React interview questions and their corresponding answers to prepare for your next technical interview? Do not worry, we are here to help you. React is a potent, flexible, and open-source JavaScript library that enables developers to develop simple, quick, and scalable web apps. React was established by Jordan Walke, a software engineer and an experienced professional from Facebook. JavaScript developers can effortlessly develop web apps with this tool.
In this article, we have curated a set of important React interview questions that cover a range of topics, from basic to advanced, including Virtual DOM, State and Props, Routing, JSX, Hooks, and Components. These questions are for everyone, whether you are a fresher prepping up for your first interview or a seasoned expert with 2-10 years of experience. So, these react interview questions for experienced can also help them. These React interview questions will help instill confidence in you to clear job interview.
React Interview Questions for Freshers
Let’s delve into some common React interview questions that could be asked during the interviews. These react native interview questions can help you excel in the interview for a front-end developer position.
What is ReactJS?
ReactJS is a JavaScript library applied to develop reusable elements. It is used to create a single-page application with a component-based architecture, effective re-rendering using the virtual DOM, and a feature to handle dynamic content. There is no need for full-page reloads.
Interviewer may aslo ask the below react interview questions:
Top Features of React:
Virtual DOM: React utilises a virtual DOM to effectively up-to-date and render factors, guaranteeing quick performance by reducing direct DOM manipulations.
Component-based Architecture: React sets the user interface with reusable, isolated components. This makes coding more scalable, manageable, and modular.
Hooks: React Hooks enable functional components to handle state and side effects, which makes them strong as well as flexible.
Server-side Rendering: React can be utilised for server-side rendering, wherein HTML content is produced pm the server and forwarded to the client. As a result of this, the performance of the applications improves.
React Router: React Router facilitates navigation in the application. It enables users to refine the routes for diverse views in a single-page app.
What is the Newest Form of React?
The newest version of React is v19.1.0, which rolled out in March 2025. This version is based on the prime updates launched in React v19.0.0, which was officially launched in 2024.
Elucidate the MVC Architecture
MVC or Model-View-Controller framework refers to an architectural pattern that segregates an app into three key components- Model, View, and Controller. Every element is designed to manage particular development factors of an app. It segregates business, presentation, and logic components from each other.
Discuss the Build Blocks
There are five building blocks in React, including
Components – Components are reusable code blocks that return HTML.
JSX- refers to JavaScript and XML, enabling users to draft HTML in React.
Props and State– Props are the function factors, and State is like variables
Context– This enables data passing through components as props in a series
Virtual DOM– This is a light replica of real DOM that facilitates easy DOM manipulation
Summarise Props and State
This is another common react interview questions. Props are basically used to pass data from a component to another. Whereas, the state is where the local data is being stored and cannot be shifted to other components. The table below shows the difference between the two:
| Props | State |
| Data shifts from a component to another | Data shifts within the component only |
| Immutable | Mutable |
| Props can be used together with state | State can be used with state components only |
| These are read-only | Both read and write |
What is Virtual DOM?
Virtual DOM is in-memory representation of real DOM, which allows React to be up-to-date and render UI in React by weighing present and previous virtual DOM states.
What is JSX?
JSX is generally a syntax extension of usual JavaScript that is being applied to create React components. The components are then rendered to the React DOM and could be written in JSX. Users need to include expression in curly brackets {} to implant any JavaScript expression in JSX code.
How Could Browsers Read JSX?
This is one of the important react interview questions. Generally, browsers are unable to read JSX. However, pure JavaScript can be read. Web browsers read JSX using transpiler that transforms JSX to JavaScript. It is known as Babel.
What is Conext API?
The Context API is method of data sharing across components that eliminates need to pass props at every stage manually. It allows a provider component to maintain a value and a consumer component or Usecontext() hook to avail it.
What is Key?
Key is an extraordinary string attribute that users should include while developing lists of elements in React. The keys are utilised for identifying the list of items that are altered, updated, or deleted. Simply, these keys are utilised to build an identity for the listed elements.
How is the Render Method Used in React?
Function ‘render ()’ could be used to render HTML to web page. The objective is to display the specific HTML code within the corresponding HTML component. In the render () method, we can comprehend props and state and return our JSX code to base element of app.
Why is setState() Important in React?
setState() is an approach used to update the state of a component. After updating state, React re-renders component and subcomponents to show the changes.
What are Pure Components?
A pure component is a form of React component that re-renders if it makes a change in the props or state. Pure component is a base class that automatically conducts a minor comparison of props and state to show if a re-render is important.
What is a Higher-order Component?
High-order components, or HOC, are a sophisticated way to reuse the component functionality logic. It just considers the original component and returns the improved component. HOCs are favourable as they are convenient to code and read. It also helps avoid replicating similar logic in each component.
What are Components and Their Type in React?
A component is a core building block of React. Simply, every application developed in React is composed of pieces referred to as components. These make it easy to build UIs. Two major components are there:
Functional: Functional components are basically JavaScript functions that have limited features, like state and lifecycle methods initially. However, the launch of Hooks enabled functional components to use state, deal with side effects, and evaluate other features.
Class: Class components are complicated than functional components. They can deal with state, lifecycle methods, and can engage with other elements. The class components can share data with each other through props, like functional components.
Therefore, these react JS interview questions and answers can be asked by the interviewer.
Wrapping Up
These React interview questions must be considered while preparing for your next interview. We have covered almost all the topics. Hence, you must understand these concepts to increase your confidence. By preparing these reactjs interview questions, you may grab a high-paid job. Stay tuned for more react interview questions and answers.
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Offline First React Native Application: A Comprehensive Guide
