create a weather app that uses a free api in javascript

To create a weather app using a free API, you can follow these steps:

Find a free weather API. OpenWeatherMap is a popular choice that provides free access to their API.
Sign up for an API key.

Create a new HTML file, and in the <head> section include the following code to include jQuery and Bootstrap:


index.tsx
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
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Create a form in the body of your HTML file where users can enter the city they want the weather for.


index.tsx
<div class="container text-center mt-5">
  <form onsubmit="getWeather(event);">
    <div class="form-group">
      <label for="city">Enter City</label>
      <input type="text" class="form-control" id="city" placeholder="e.g. New York" required>
    </div>
    <button type="submit" class="btn btn-primary">Get Weather</button>
  </form>
</div>
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Create a function called getWeather() in your JavaScript file that makes a request to the weather API using jQuery's $.getJSON() method. Pass the city entered by the user to the API request.


index.tsx
function getWeather(event) {
  event.preventDefault();
  const apiKey = "YOUR_API_KEY_HERE";
  const city = $("#city").val();
  const url = `https://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${apiKey}`;
  $.getJSON(url, function(data) {
    // code to display weather information
  });
}
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In the callback function for the $.getJSON() method, extract the relevant weather information from the response data and use it to update the HTML on the page.


index.tsx
$.getJSON(url, function(data) {
  const weather = {
    city: data.name,
    country: data.sys.country,
    description: data.weather[0].description,
    temperature: Math.round(data.main.temp - 273.15),
    humidity: data.main.humidity
  };
  $("#weather").html(`<h2>${weather.city}, ${weather.country}</h2>
                      <p><strong>Description:</strong> ${weather.description}</p>
                      <p><strong>Temperature:</strong> ${weather.temperature} &deg;C</p>
                      <p><strong>Humidity:</strong> ${weather.humidity}%</p>`);
});
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Finally, add an empty <div> with an ID of "weather" to your HTML file where the weather information will be displayed.


index.tsx
<div class="container text-center mt-5">
  <!-- form code goes here -->
  <div id="weather"></div>
</div>
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Make sure to replace "YOUR_API_KEY_HERE" with your actual API key obtained from OpenWeatherMap.

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related categories

javascript

api

weather