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let city = prompt("Enter a city: ");

fetch(`http://api.openweathermap.org/data/2.5/weather?q=${city}&APPID=YOUR_APP_ID`)
  .then(response => response.json())
  .then(data => {
    alert(`It is currently ${data.main.temp - 273.15}°C (${(data.main.temp - 273.15) * 9/5 + 32}°F) in ${city} with a humidity of ${data.main.humidity}%.`);
  });

You can use the JavaScript fetch() API to request data from a weather API. For example, this code snippet would return the forecasted temperature data for the next 5 days in the fiveDayForecast variable:

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let fiveDayForecast;

fetch('https://api.weather.com/forecast/daily?days=5&units=metric&key=[YOUR API KEY HERE]')
    .then(response => response.json())
    .then(data => {
        fiveDayForecast = data.forecast.forecastDay;
    });

More information on the fetch() API can be found in the MDN Fetch API Documentation.

Using JavaScript, you can use the Fetch API to send an HTTP request and get the API response.

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fetch("https://jsonplaceholder.typicode.com/comments")
  .then(res => res.json())
  .then(data =>  {
    console.log(data);
  });

You can also use a library like Axios to make the same request:

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axios.get("https://jsonplaceholder.typicode.com/comments")
  .then(res => {
  console.log(res.data);
});

Learn more:

• Fetch API
• Axios

The first step is to find an API that provides the necessary data. A good place to start is OpenWeatherMap, which provides a free API that offers specific API calls for retrieving current and forecast weather data.

After signing up for an API key and getting the API call from OpenWeatherMap, the next step is to write a React component to make the API call. This can be done using JavaScript's fetch API method.

Below is a simple example of a React component named MyWeatherComponent which requests current weather data for one day and displays it in the DOM.

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import React, { Component } from "react";

const API_KEY = "<INSERT_OPENWEATHERMAP_API_KEY_HERE>";

class MyWeatherComponent extends Component {
  state = {
    weatherData: ""
  };

  componentDidMount() {
    this.fetchWeatherData();
  }

  fetchWeatherData = () => {
    fetch(
      `http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=${API_KEY}`
    )
      .then(res => res.json())
      .then(data => {
        this.setState({
          weatherData: data
        });
      });
  };

  render() {
    return (
      <div>
        {this.state.weatherData.name}
        {this.state.weatherData.main.temp}
      </div>
    );
  }
}

export default MyWeatherComponent;

This example fetches the current weather data for London, but with a few modifications it can be used to fetch a forecast for one day. It is also possible to modify the API call to get weather data for a city other than London.

You can make an HTTP requests in Javascript using the fetch API. An example of a GET request using the fetch API is below:

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fetch('https://example.com/file')
  .then(response => response.json())
  .then(data => console.log(data));

By calling the fetch() function, you can make an API call to any endpoint with an optional configuration object. The .then() functions allow you to manipulate the response and use the response data for further operations.