React Interview Questions for freshers

React interview preparation can feel both exciting and overwhelming, especially when you’re just starting your journey into React. Starting your journey into React can feel both exciting and overwhelming. Especially when you know a React interview is coming up for you. But don’t worry! We will make it fun, clear, and easy for a beginner. This article will take you down the common React interview questions for freshers, allowing you to feel confidently prepared while learning the basics in an engaging manner.

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An important dignitary in a suit faces the woman who is taking notes in a bright office, a unique spectacle, somewhat of an estranged setting.
A professional interview involves discussing topics such as opportunities and qualifications.

What is React and Why is it so Popular?

You may have heard that React is a JavaScript library, but what does that really mean? React assists developers in creating user interfaces, particularly single-page applications.

It’s developed by Facebook and boasts an enormous developer base. The reason it’s so popular is that React is easy, fast, and scalable.

In a React interview, you might be asked, “What is React?” A good response is: “React is a JavaScript library for creating fast and interactive user interfaces.”

Most companies use React because it allows them to create stunning apps with little code. And guess what? That’s exactly what interviewers want to hear!

Another awesome thing about React is how it updates. You don’t have to refresh the page whenever something is changing. That’s magic!

React Interview: What are the Components?

React apps are made from components. Think of components as building blocks. They can help you split your UI into smaller, reusable pieces.

In a React interview, you could be asked, “What are the varieties of components?” There are most important sorts: useful and class components. Functional additives are just JavaScript capabilities.

Class additives use ES6 instructions and provide extra functions like lifecycle methods.

If you’re new to coding, don’t strain. Just keep in mind this: additives = Lego blocks on your app’s UI. Reusable, simple, and a laugh!

Also, additives make your code neat and tidy. You can construct something as soon as and use it multiple times throughout your app.

React Interview: What is JSX?

Even though JSX looks like HTML, it’s actually a syntax extension of JavaScript. React uses JSX to describe the UI views.

In a React interview setting, the question goes, “What is JSX?” An easy answer would be, “JSX is a way to write HTML in JavaScript.”

JSX helps with a clearer description of the component and more readability, showing the layout clearly. It is just an axial combination of HTML and JavaScript.

It is often said that the workflow improves with JSX, and yes, it truly does after getting used to it.

What are Props in React?

Props (from “properties”) allow for the passing of data from one component to another. Props are read-only and keep your UI dynamic.

One React interview question could be: “How do you use props?” You might answer, “Props allow components to receive data from their parent components.”

Imagine the props as gift boxes. Each component receives a box, packed full with items it requires. But it cannot get into the box and take out or alter what is inside.

Props, when used correctly, keep your application consistent and predictable. Every good React app needs this.

What is State in React?

By contrast, states are local and can be changed within the component. It keeps the information tracking and tell the UI to change whenever there is a change.

You may be inquired, “What is the difference between a state and props?” Just keep in mind: props are passed down, state is held within.

With functional components, state can be handled easily with the useState hook-now doesn’t that sound scary!?

State makes your app come alive. Whenever the user interacts with your application, state changes, and React will update the view. Learn more about React and its concepts on ReactJS Interview Questions.

Explain the usestate hook in the react

Usestate hook lets you add state to functional components. It returns an array with a function and a function to update it.

In a react interview, they can ask, “How does it work?” Try to say this, “It helps to manage the state easily in functional components.”

Here is a quick example:

const [count, setCount] = useState(0);

It likes to say, “Start counting at zero, and later use the septure to replace it.” Simple, right?

What is virtual dome?

Virtual Dome is a light copy of the real dome. React uses it to make updates faster and more efficient.

A common response interview question is “Why use virtual dome?” Say: “It only helps update parts of UI that has changed.”

This means better performance and smooth user experience. The react compares the new virtual dome with the old one and only updates the one that is necessary.

This process is called “reconciliation” – a fancy word is not wasting and wasting time to be smart.

What are the reaction hooks?

Hooks are functions that allow you to use state and other features in functional components. The react introduced him in the 16.8 edition.

Interviewers may ask, “What are the hooks in the react?” You can say, “Hook lets you manage state and life cycle facilities without using classes.”

The most popular hooks are Usestate, Useeffect and Usecontext. Learn this and you are already ahead!

The hook made the functional component powerful and simple, so now most developers prefer to use them rather than class components.

What is used in response?

Useeffect hook lets you run the code after rendering. It is great to receive data or subscribe to events.

If asked in a react interview, “Why do we use?” Try it: “To do side effects like API calls or dome updates.”

You can also control when you pass the dependence. No dependence = it runs after every render. A dependency = it moves when it changes.

It likes to tell the react, “Run this code only when needed. Not all the time.”

What is the difference between class and functional components?

Class components use eS6 classes and can be a life cycle methods. The functional components are simple and use hooks for additional features.

Reactors like to ask this. There is a good answer: “functional components are simple and can use hooks. Square components use life cycle methods.”

Today, functional components are more popular. So it is smart to focus on your learning.

Nevertheless, it is good to understand both – some old codebase still uses square components.

What are the keys in response?

Keys helped to identify which items have changed, pairs, or have been removed in a list. They should be unique and stable.

In the interview, the question can be, “Why are the key important in the react?” You can answer, “They efficiently help react to updated lists.”

When providing the list, always add a key. This is a small thing that creates a large performance difference.

It also avoids annoying warnings in the console!

What is conditional rendering in response?

Sometimes, you want to show different UI elements depending on a condition. This is the place where conditional rendering comes.

In a react interview, you can be asked, “How do you handle conditional rendering?” A simple answer: “Using If-Els or Turner Operators.”

Example:

{loggedIn ? <LogoutButton /> : <LoginButton />}

React makes this argument clean and readable.

You can also hide the elements using completely short-circling:

What is the purpose of usecontext?

Usecontext hook helps you access data in components without manually passing the props through every level.

You can hear, “What is used for usecontext?” Answer: “Managing global data such as subjects or user settings without propus drilling.”

It is like a magical pipe that distributes data where it is required – no mess, no disturbance.

React reference is very useful when you are working with settings, themes, or user authentication in many components.

How do you handle forms in response?

Handling form means tracking the state as tracking input values ​​and typing users. The react makes it a controlled process.

The interviewer may ask, “How do you handle the form?” You can say, “using the state to manage and present input values.”

Controlled components are important here. Each input has a value associated with the position of the component.

All this is about control – you always know what is inside every field in your form.

What is Redux and why use it?

Redux is a state management library that is often used with response. This helps to manage the complex app states in an estimated way.

In a react interview, you can hear, “Why use Redux?” Here is your answer: “Big app to handle states in a consolidated way.”

Although it is not necessary for small applications, Redux shines in large projects where the data flows through several components.

Redux uses tasks and Reducers to manage the state. This adds structure to your app, which is super useful in large projects.

Final suggestion before your react interview

Do not just miss the answer. Try to make small apps. Practice to explain the concepts loudly. And if you forget something, do not panic.

Interviewers know that you are new. They are looking for your enthusiasm and understanding – not perfection. Smile, be calm, and show what you have learned.

In addition, review general mistakes make with the initial react. This makes you look active and serious about improvement.

Finally, take a deep breath and have fun. You have found this!

Remember, learning reaction is a trip. The more you create, the more you learn. And every bug teaches you something new! For extra practice, check out these top 30 React JS interview questions and answers to get hired in 2025.

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