React Js Questions For Interview

React is a popular front-end library for building user interfaces. It’s used by companies like Facebook, Instagram, and Netflix, to name a few. In this article, we will provide React questions for interview that will help you learn more about the library and how it can be used in your project. If you’re looking to get a job with one of these companies, make sure to read through these questions and answer them as best you can.

What is React?

React is a JavaScript library for creating user interfaces. It was created by Facebook in 2013 and quickly became popular. React is modular and composable, which makes it easy to create complex UIs. React also has a very low learning curve, making it perfect for beginners.

What are the benefits of using React?

React is a JavaScript library for building user interfaces. It’s popular because it creates fast, reactive UIs that are easy to scale. React also offers composability and declarative programming features, making it ideal for creating complex UIs.

Here are some of the benefits of using React:

React is fast. React applications load quickly and respond quickly to user input. This makes React perfect for web applications and mobile apps.

React is scalable. Because React is built on top of the JavaScript language, you can easily expand your UI as your application grows in size. In addition, react maintains its performance even when components are re-used across multiple pages or screens in a app.

React is composable. You can build complex UIs by compose simple components. This makes it easy to reuse code and make your UI modularized.

How can React be used in web development?

React is a javascript library for building user interfaces. It is built on the React Router and ReactDOM libraries which allow developers to create UI components with simple DSLs. React has been widely adopted by web developers and is used in many popular frameworks, such as Vue, Angular, and Knockout.

React can be used in two ways: as a standalone library or as part of a larger framework. As a standalone library, react can be integrated into existing projects without any changes. When used within a framework, react requires the use of an adapter layer to enable it to work with the underlying framework.

If you are interested in using React in your next project, here are some questions to ask:

  •  What kind of applications do you typically develop?
  •  Do you have experience working with React?
  •  What types of design patterns are you comfortable working with?
  •  Are you familiar with any front-end development frameworks? If so, which ones?
  •  Do you have any experience setting up a development environment for different languages (e.g. NodeJS)?
  • Do you have any questions about how React works?

What are some common problems that users face with React?

Some common problems that users face with React
One of the most common problems with React is that it can be difficult to learn and use. When first starting out, it can be difficult to know where to start, and it can be easy to get lost in the complex syntax. Another common problem is that React can be slow when compared to other front-end frameworks, which can make it difficult to create fast, responsive websites. Finally, React is not always compatible with certain browsers, so developers may have to choose between using a different framework or developing for a limited range of browsers.

What are some tips for troubleshooting React issues?

If you’re new to React and run into problems, here are some tips for solving them.
First, make sure you understand the basics of React: how it works, what components are, how state works, etc. As with any new technology, the more you know about it the better your chances of solving problems and succeeding with React.

Second, try to debug your code by printing out variables and their values as you type them in the console (F12 in Chrome). This can help track down where things go wrong.

Third, if all else fails, ask a friend or colleague for help. There’s nothing worse than getting stuck trying to figure out something on your own!

How would you create a component that displays information?

The goal of this blog post is to provide an overview of one way that React might be used in a web application or mobile application. In particular, we’ll look at how React can be used to create reusable components.

React is a popular JavaScript library for building user interfaces. It uses a “virtual DOM” to update the display of data as it changes. This makes React well-suited for creating user interfaces that are automatically updated as data changes.

In this tutorial, we’ll create a simple component that displays the current weather conditions for a given location. The component will take two input parameters: the address of the location and the desired temperature range (in degrees Fahrenheit).

We’ll start by creating a new React project using the create-react-app tool. Then, we’ll install React and its dependencies using npm . We’ll also install react-jasmine , which is used to test our code. Finally, we’ll create ourWeatherComponent using the following code:

import React from ‘react’; import { mount } from ‘react-dom’; import { Button } from ‘react-native’; import WeatherApp from ‘./weatherApp’; export default class MyWeatherComponent extends React.Component { state = { address: ” }; constructor( props ) { super(props); this.state = JSON.parse(this.state); } render() { return (

How would you create a component that manages user input?

A React component that manages user input could be implemented in a variety of ways. One option would be to create a stateless component that exports an input handler function. This function would take in a single React element as its argument and would need to be able to handle all the common input scenarios such as validating input, handling errors, and reacting to user interactions.

Another approach would be to use react-input-validator to abstract away the handling of user input from the component itself. This library provides built-in support for validating input against a set of rules, reacting to errors, and performing other common tasks such as changing props based on user inputs.

Both approaches have their strengths and weaknesses. Stateless components are easy to write and maintain, but they can lack the responsiveness and interactivity of more complex components. Validators are easier to use but may not offer the same degree of customization or extensibility as more sophisticated components.

What are some common issues that people run into when using React?

When starting out with React, it can be difficult to know where to start. This article will outline some common issues that people run into when using React.

  1. Trying to use React in an existing web application: When starting out, it is often tempting to try and use React in an existing web application. However, this can be a difficult task. In order to use React effectively in a web application, you will need to first understand how the app is structured and then rewrite parts of the codebase using React. Alternatively, you can use a library such as react-router which will help you structure your app more easily.
  2. Misunderstanding how state works in React: One of the key differences between traditional web developers and those who are familiar with React is the way state works. In traditional web development, state is usually stored in global variables or within the component itself. In contrast, state in React is typically stored within container components or stores. This makes it easier for developers to understand and control the flow of data within a given component.
  3. Creating too many components: Another common issue that people run into when using React is creating too many components. Too many components can lead to confusion and complexity within your app. Try to keep your component count as low as possible while still achieving desired outcomes.
  4. Not understanding how animations work: Animations are another key feature of React that can be challenging for beginners to understand.

What are some tips for debugging React applications?

Debugging React applications can be challenging, but there are some tips that can help. Here are a few:

  1. Use Chrome’s “React Developer Tools”. This allows you to inspect the state of a React component at any point in time, as well as track down any errors.
  2. Use console.log(). This will print out all of the code that is running in the current context.
  3. Use the debugger tool provided by React. This provides a more in-depth debugging experience, and includes features for tracking down react components and their state changes.

What is the future of React?

React is an open source JavaScript library for building user interfaces. It was created in 2013 by Facebook. React is popular because it makes it easy to create reusable components and enables fast development. React is intended to be used withHTML, CSS, and JavaScript. React has a large community of developers who are constantly creating new features and libraries for React. The future of React looks promising because it is becoming more popular and more versatile.


React is a powerful JavaScript library used by many developers. In this article, we’ll be looking at some common questions that might come up during an interview for a React role. We’ll also provide some tips on how to answer these questions and put your best foot forward in an interview setting. So whether you’re interviewing for a front-end development role or any other position within the company, our advice should help you shine!