To build a weather app in React, you will need to have the React library and a code editor installed on your computer. You will also need to sign up for an API key from a weather API service, such as OpenWeatherMap or Dark Sky.

1. First, create a new React application using the create-react-app command-line tool.
2. Next, create a component for the weather app. This component will handle the API request, data retrieval, and display of the weather information.
3. Import the Axios library, which is a popular library for making HTTP requests in React.
4. Use the useState hook to create state variables for the weather data and the city name.
5. Create a function that makes an HTTP request to the weather API using the Axios library and the API key. This function should update the state variables with the weather data and the city name.
6. In the render method of the component, display the weather data and city name using the state variables. You can also include form fields and buttons for the user to search for the weather in different cities.
7. Test your app and make any necessary adjustments.
8. Deploy your app to a hosting platform, such as GitHub Pages or Netlify.

That’s it! With these steps, you can build a weather app in React that allows the user to search for and view the weather in different cities. By using the Axios library and a weather API, you can retrieve and display real-time weather data in your app. Whether you’re a beginner or an experienced developer, this code provides a good starting point for building a weather app in React.

Here is an example of the code you would need to create a basic weather app in React:

import React, { useState } from 'react';
import Axios from 'axios';
import './App.css';

const API_KEY = 'YOUR_API_KEY';

function App() {
const [weather, setWeather] = useState({});
const [city, setCity] = useState('');

const handleCityChange = (event) => {
setCity(event.target.value);
}

const handleSubmit = (event) => {
event.preventDefault();
Axios.get(http://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${API_KEY})
.then((response) => {
setWeather(response.data);
});
}

return (
<div className="App">
<form onSubmit={handleSubmit}>
<label htmlFor="city">City:</label>
<input
       type="text"
       name="city"
       value={city}
       onChange={handleCityChange}
     />
<button type="submit">Search</button>
</form>
{ weather.main && (
<div>
<h2>{weather.name}</h2>
<p>Temperature: {weather.main.temp}°F</p>
<p>Description: {weather.weather[0].description}</p>
</div>
)}
</div>
);
}

export default App;

This code creates a basic weather app in React that allows the user to search for the weather in a city. The app uses the Axios library to make an HTTP request to the OpenWeatherMap API, and the useState hook to create state variables for the weather data and the city name.

The component’s form fields are connected to the state variables using the value and onChange props, and the state variables are displayed in the JSX template using curly braces. The form includes an event handler for the submit event, which makes an HTTP request to the weather API using the Axios library and the API key. The response from the API is used to update the weather state variable, which is then displayed in the user interface.

In summary, this code creates a basic weather app in React that allows the user to search for and view the weather in different cities. By using the Axios library and a weather API, you can retrieve and display real-time weather data in your app. Whether you’re a beginner or an experienced developer, this code provides a good starting point for building a weather app in React.