10 Answers to Your Questions About React Js Developer

10 Answers to Your React JS Interview Questions

Interviews for IT jobs are nothing to be afraid of, especially if you have practiced the most likely React JS interview questions beforehand. For this reason, we combed the web to compile thorough lists of typical React JS interview questions posed during React JS developer job interviews, as well as advice on how you should approach and respond to them. You can do this.

Learning technical skills is fantastic. But after you’ve mastered them, it’s time to start applying for and attending tech job interviews. We have advice for you if you’re unsure about what to say when you’re in front of a hiring manager in person.

React JS Interview Questions to Ask React Js Developer

React JS interview questions can be the most helpful thing that might help you to crack the interview of any big software development company. Moreover by understanding these React JS interview questions you can gain the basics of react js.

Below are a few of the mentioned basic React JS interview questions that you can refer to:

1. What is react js and its features?

In 2013, Facebook created the JavaScript library React JS for the user interface. Single-page web or mobile applications can be made with it. It is a strong library that works well for obtaining rapidly changing data. Data rendering is its primary purpose.
React JS’s features:

  • JSX and virtual DOM.
  • binding of one-way data.
  • Declarative UI with native React.
  • architecture based on components.
  • Flexibility, effectiveness, and speed.

2. Please list the benefits of using React

Businesses using React JS might expect higher performance than those using other frameworks. React JS’s ability to stop the DOM from updating makes apps faster and more user-friendly. React JS was created to assist in improving the total number of pages that the website server renders.
The benefits of using react js are as follows:

  • React makes the process of authoring the various parts easier overall.
  • It increases productivity and makes future maintenance easier.
  • Also guarantees reliable code and quicker rendering.
  • The main feature is it provides helpful developer tools and is SEO-friendly.

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3. List the limitations of using react js

React Js is a javascript library.
The react js library is a vast library so eventually, designers spend a lot of time understanding the set of components inside the library.
Due to its immense size and vast set of skill sets, it becomes difficult for new programmers to understand the library.
JSX programming and inline templating make the programming harder.

4. What virtual DOM of React and also explain its works?

Virtual DOM is mainly a programming trick kind of in which the Virtual DOM is synced with the real-time DOM library known as React DOM. This whole process is called reconciliation. Virtual DOM is the most important implementation in React Js.

5. How does React Js help in maintaining the SEO?

React Js is the javascript library that has kept enhancing with time. The main reason why react js is widely used for creating websites is that it is easy to rebuild and the updates can be done easily. And as we know to yield better results on the search engine it is very very important that you keep on updating the website.

It is very uncertain to understand the google algorithm and hence React Js provides the best solution to this plus helps to create interactive and responsive websites.

6. What does JSX signify in React? Give an example while describing with proper language

It is a JavaScript syntactic extension known in React as JSX. To determine how the user interface should look, utilize it with React. JSX might look like a template language, yet it supports all of JavaScript’s features. For React, JSX generates “elements.”

7. Why can’t browsers comprehend JSX?

Because browser engines lack an inherent way to read and understand JSX, browsers cannot read it. Using labels, you may turn your HTML and JavaScript into native formats that browsers can read.

8. What does render () in React do, and why is it used?

React’s render() function displays the supplied HTML code inside the designated HTML element. This method takes two arguments in the form of HTML code and an HTML element and returns a single element that represents the native DOM component.

9. Describe how Angular and React are different

When compared to Angular, React is a library. React.js uses virtual DOM and one-way data binding while Angular uses real DOM and two-way data binding. Additionally, React is faster and has a smaller bundle size.

10. Describe what state is in React and how React uses it

A component’s state, a JavaScript object, controls how the component behaves and keeps its dynamic data. The state is dynamic, allowing a component to be dynamic and interactive while also keeping track of altering data between renderings. Only class components can use state, not other components.

11. Compare conditions and props

Props, also known as properties, are objects with open-ended inputs that a React function component will take as its first parameter. The state is information that changes during the lifespan of a particular React component instance.

12. Evaluate components that have and don’t have states

Simple functional elements without a local state are known as stateless components, however, you can also add state behavior to functional elements using a hook in React. State objects, event-handling capabilities, and user actions are examples of stateful components.

13. What is React.js, exactly? What differentiates it from other javascript frameworks?

JavaScript solutions (like React. JS) take over a lot more functionality and document manipulation when compared to older technologies, giving the impression that the application was not server-rendered at all. The distinguishing feature of React JS over other well-liked JavaScript frameworks is flexibility.

14. What is a React component’s lifecycle?

These events, which fall into four types, are where the lifecycle of a React component occurs: Update: In this case, the React component enters the DOM after the methods and events have taken place. When a React component unmounts from the DOM or departs it, the methods and events in this case take place.

15. Have you worked with HTML while using React.js?

JavaScript is used to create HTML with React. instead of altering HTML to make it compatible with the data, to rely on JavaScript’s power to build HTML that is dependent on some data. Other JavaScript frameworks typically improve HTML.

16. “Everything is a component in React.” Explain.

The foundation of a React application’s user interface is components. These parts divide the entire user interface into manageable, reusable chunks. Then, without altering the rest of the UI, it makes each of these components independent of the others.


To conclude, When interviewing a React developer, you should evaluate their grasp of React as well as their knowledge of JavaScript and other subjects that are more directly related to the project or role in question. These are some of the React JS Interview Questions that can help you to crack the interview.

This post made an effort to go through a few fundamental talking points that would show whether or not a developer has sufficient comprehension of React and its fundamental ideas. Good luck, and we hope you find it beneficial.