What exactly is ReactJS ?

ReactJS is an open-source JavaScript library

ReactJS, sometimes known as React, is an open-source JavaScript package used to create UI elements and user interfaces for online applications. Facebook created it and is commonly used to design interactive and dynamic web interfaces. React has a component-based design, which makes complex user interfaces easier to maintain and update by breaking down the UI into reusable components.

Here’s a simple example of a React component that simply says “Hello, React!” Presents. Message:

// Import the necessary React library
import React from 'react';

// Define a functional component named "HelloReact"
function HelloReact() {
  return <h1>Hello, React!</h1>;

// Export the component to make it available for use in other parts of the application
export default HelloReact;

You would typically create a root component and render the HelloReact component inside it to use this component in your application. Here’s how you can go about it:

// Import the necessary React library
import React from 'react';
import ReactDOM from 'react-dom';

// Import the HelloReact component from the previous example
import HelloReact from './HelloReact'; // Assuming the component is in the same directory

// Create a root component
function App() {
  return (
      <HelloReact />

// Render the root component in the HTML element with the ID "root"
ReactDOM.render(<App />, document.getElementById('root'));

In this illustration, the parent component that renders the HelloReact component is the App component. “Hello, React!” The message will appear on the webpage when the application is launched.

A development environment to work with React is often set up using programs like Node.js, npm (Node package manager), and bundlers like Webpack or Parcel. Using these tools, you can bundle your code, manage dependencies, and launch a development server to test your React application.

Remember that this is only a very simplified example. React’s ability to create multiple components, manage state, handle user input, and communicate with external data sources enables the development of significantly more sophisticated and feature-rich apps.

You May Require to Read

What is difference between ReactJS vs React Native

Leave a Reply

Your email address will not be published. Required fields are marked *