How to Write 'Hello World' in React

React is a popular front-end library for building user interfaces. If you are new to React, writing a "Hello World" program is a great way to get started. In this blog post, we will go through the steps to create a simple "Hello World" program in React.

Step 1: Set up Your Environment

Before you can write any React code, you need to set up your development environment. You will need Node.js and a package manager like npm or yarn installed on your computer. Once you have those installed, you can create a new React project using the following command:

npx create-react-app my-app

This command will create a new React project called my-app in your current directory.

Step 2: Open Your Project in a Code Editor

Once your project is set up, you can open it in your favorite code editor. Popular options include Visual Studio Code, Atom, and Sublime Text.

Step 3: Write Your "Hello World" Code

Now that your project is set up and you have opened it in a code editor, you can start writing your "Hello World" code. Open the src/App.js file in your code editor and replace the existing code with the following:

import React from "react"

function App() {
  return (
    <div>
      <h1>Hello World!</h1>
    </div>
  )
}

export default App

This code imports the React library, defines a new function called App, and returns a simple div element with an h1 heading that says "Hello World!".

Step 4: Start Your React App

With your code written, you can start your React app using the following command:

npm start

This will start your React app in development mode and open it in your default web browser at localhost:3000. You should see your "Hello World" message displayed in the browser.

Congratulations! You have just written your first "Hello World" program in React. From here, you can continue to build more complex user interfaces using React's powerful features and tools.