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How Do You Use a Weather API in Java/JS?

Check our our a step-by-step guide on how to use a weather API in Java/JS

Ruth Favela writer profile photo
By Ruth Favela

Updated September 12, 2023.

Here's a step-by-step guide on how to use a weather API in Java/JS:

  1. Choose a weather API: There are various weather APIs available, such as Tomorrow.io, OpenWeatherMap, Weather Underground, and Dark Sky. Select the API that best suits your needs.
  2. Get an API key: You'll need to sign up for the weather API of your choice (like this one) and get an API key. This key will be required for accessing the weather data.
  3. Set up your Java/JS environment: Make sure you have the appropriate Java/JS environment installed on your computer.
  4. Install the weather API library: Depending on the API you choose, there may be a Java/JS library available that you can use to access the API. Install the library as per the instructions provided.
  5. Make a request to the API: To get weather data for a particular location, you'll need to make a request to the API. Depending on the API, you may need to provide the latitude and longitude of the location or the city name and country code.
  6. Parse the response: Once you receive a response from the API, parse the JSON or XML data to extract the weather information you require.
  7. Display the weather information: You can now display the weather information in your Java/JS application. Depending on your application, you can choose to display the information as text, graphics, or both.

What Code Can I Use to Get Started with Tomorrow.io’s Weather API in Java?

If you’re looking for sample code to get started with Tomorrow.io’s weather API, here is a sample code for Java:

import java.net.*;
import java.io.*;
 public class TomorrowIoExample {
public static void main(String[] args) throws Exception {
String apiKey = "YOUR_API_KEY";
String location = "New York";
URL url = new URL("https://api.tomorrow.io/v4/timelines?location=" + location + "&fields=temperature&timesteps=1h&apikey=" + apiKey);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
Let's go over an example of using Tomorrow.io’s weather API to retrieve the temperature data. In this example we want the weather for New York for the next 24 hours, with data points every hour.

You'll need to replace "YOUR_API_KEY" with your actual API key, which you can get by signing up for Tomorrow.io’s API.

Once you run this code, you'll receive a JSON response containing the temperature data for the specified location and time range. You can then parse this response to extract the temperature data and display it in your application as required.