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How To Create A Weather App For Windows And Mobile Using An API

a team discussing about weather app api on laptop

Creating a weather app for both Windows and mobile platforms using an API is an exciting project. It taps into real-time data and user interface design. Whether you’re a budding developer or a seasoned programmer, this guide will help you understand every aspect of weather app APIs.

You will learn how to create a cross-platform real-world weather application using a weather app API called WeatherStack API. We will also discuss how Delphi FireMonkey applications can target Android, iOS on mobile and Windows, macOS, and Linux on the desktop. Let’s get started!a weather app api demonstrating new york weather

Important Things to Consider Before Selecting a Weather App API

There are a few things to take into account while choosing a weather app API for an app:

  1. Accuracy: Check to ensure that the weather information the API gives is exact and reliable. Inaccurate figures could make the clients unhappy and lose confidence in your application.
  2. Coverage: Verify whether the weather app API is available worldwide or only in a few places. The target user base for your app may require weather information for multiple global locations.
  3. Data Frequency: Take into account how often the API refreshes its database. For customers who want current weather information, especially for outdoor activities or travel plans, real-time or frequent updates are essential.
  4. Support and Documentation: Evaluate the degree of assistance offered by the API provider and the caliber of the documentation for the API. While responsive help can assist with settling any issues that might emerge during development, well-written documentation facilitates API integration into your application.
  5. Historical Data: Certain apps might need access to previous weather data for analytical or research purposes. Check the length of the accessible history records and whether the weather app API provides historical weather data.
  6. Pricing and Limitations for APIs: Examine the API’s cost structure and any usage constraints, such as minute-by-minute requests or restrictions on data access. Make sure the API’s cost fits your application’s spending plan and usage needs.
  7. Dependability and Uptime: Select an API that has a track record of dependability and little downtime. The usability and functionality of your app may be negatively impacted by unreliable APIs.
  8. Data Security and Privacy: Ensure that the API provider complies with data security and privacy regulations, especially if your app collects user location data for personalized weather forecasts.

What is the WeatherStack API?

In the vast sea of weather app APIs, WeatherStack by APILayer stands as the most reliable and trusted solution for users. The WeatherStack API is one of the market-leading weather rest api services for any application. It has real-time functionality and historical weather information and supports all major programming languages. You can retrieve accurate weather information for any location instantly.

Yes, we have been exploring and learning about WeatherStack API. Here you can see other posts which demonstrate the best features of the WeatherStack API. Moreover, flexibility over other similar web services in the market.

What Are the Key Features of Weatherstack API?

Weatherstack API provides an extensive feature set that caters to the various requirements of both businesses and developers. Let’s examine the main characteristics that make Weatherstack API the recommended option for obtaining meteorological information.

Reliable Data Sources

Thanks to its core set of data sources, Weatherstack API guarantees the highest degree of accuracy, consistency, and dependability in its weather data. Users may confidently make educated judgments because they can rely on the accuracy of the information provided.

Lightning-fast Response

Weather data is delivered with lightning-fast response times by the Weatherstack API. Data transmission is optimized for speed and compatibility across multiple programming languages by using the lightweight JSON format, guaranteeing quick integration into any project.

Scalable Infrastructure

Weatherstack API can process billions of requests daily since it is supported by a scalable cloud architecture that Apilayer has carefully designed and maintained. Whether you run an enterprise-level company or are a small-scale developer, Weatherstack API scales to suit your needs without sacrificing speed..

Flexible Location Lookup

With millions of locations at your disposal, Weatherstack API provides unmatched location lookup flexibility. Users can easily receive meteorological data for their desired location using a variety of methods, including ZIP codes, city or area names, IP addresses, and latitude and longitude coordinates. This functionality supports a wide range of use cases.

Bank-Level Security

The Weatherstack API prioritizes security in data transfer by using industry-standard 256-bit HTTPS (SSL) encryption. Security is very important. Sensitive data integrity and confidentiality are guaranteed by shielding all data streams to and from the API.

Extensive API Documentation

The foundation of a flawless integration is extensive API documentation. With its comprehensive documentation and interactive code examples available in several languages, the Weatherstack API enables developers to easily utilize all of its capabilities.

The benchmark for weather data accessibility is the Weatherstack API. With its unwavering dedication to security, scalability, dependability, speed, and user-friendly documentation, Weatherstack API is set to completely transform how businesses and developers use weather data in their apps and services. Take advantage of the Weatherstack API’s capabilities right now to expand your options for weather forecasting and analysis.

How to start with WeatherStack API?

Getting started with WeatherStack API is all simple! Just head over to the WeatherStack official web page and sign up for a free subscription plan and get your API Access Key from the dashboard.

And here is a sample API request:

Be sure to check out the official documentation before starting to use the API!

How to create a cross-platform application with the same codebase that runs on Windows, macOS, iOS, Android, and Linux?

With Delphi FireMonkey, you can create a native and cross-platform application from a single code base in no time!

FireMonkey Cross-Platform framework allows you to build native applications with 5x faster productivity. You can design and create fully functional applications swiftly with hundreds of components and libraries.

Furthermore, with the new FireMonkey App Low Code Wizard, you can build and generate a cross-platform project by selecting available options in the wizard.

FireMonkey App Low Code Wizard can create multiple screens and demonstrate coding best practices. Besides, if you need customization, you can easily code it using Delphi!

How to start with Delphi FireMonkey?

Here, you can start learning Delphi FireMonkey with the free Bootcamp session, which covers most of the essential things you need to start developing cross-platform applications with Delphi FireMonkey!


How to create a cross-platform weather app with Delphi using WeatherStack API?

In this demonstration, I will create this app and show you how to integrate with WeatherStack API.

creating a cross-platform weather app with delphi using weatherstack api

How to connect to RESTful web services in Delphi?

REST Debugger is a powerful environment to play with RESTful web services. You can start REST Debugger from the Tools menu of the IDE.

Here is how we can establish a connection:

connecting to RESTful web services in Delphi using rest debugger

And after successfully connecting to the RESTful web service, we can just copy configured REST Client components by clicking the Copy components button and paste them into our project.

Here is our application user interface structure:

application interface of a weather app api showing the weather conditions of new york

The user interface is responsive and flexible. I have tried to utilize best practices in UI design. 

Now, you need to paste the copied components from the REST Debugger and create an OnClick event on the Search button.

And paste this code to the OnClick event.

As you can see, we are reconfiguring the request URL based on the input by the user.

Then we are parsing JSON and opening the current object. The current object has the main weather data, for instance: temperature, humidity, weather icon, and more.

After that, we are getting the first element from the weather description array which holds a summary of the weather info.

Then we are parsing the weather icon and downloading the image and setting it to the TImage component.

I hope everything in this code is clear. I am pretty sure you can learn so much about JSON manipulation in Delphi and creating cross-platform applications with Delphi FireMonkey.

Here is our application in action: https://youtu.be/izEkiwNWuLM

Head over and check out the full source code here: https://github.com/MuminjonGuru/Mastering-FireMonkey-Delphi/tree/master/WeatherAppFMXWeatherStackAPI

Why Should You Choose Weather App API by APILayer?

Are you ready to build apps using a quick and cost-effective JSON API for your weather data requirements? APILayer has it all!

APILayer stands at the forefront of API marketplaces, providing top-class APIs for a wide spectrum of use cases. APIs on APILayer are fully safe and more accurate than their counterparts. All of these APIs offer a free plan, so you can try them before spending your money. Whether you want to build a weather app for Windows or mobile, sign up to APILayer and choose a high-performance API to get started.


This article presents how affordable JSON weather app APIs like WeatherStack can be used in conjunction with Delphi FireMonkey’s unmatched capabilities to create creative, cross-platform apps that are up to date with the ever-changing software market. The weather app API by Apilayer offers a strong platform for anyone beginning their journey toward developing robust and responsive weather apps for Windows or Android, regardless of experience level. So why hold off? To fully utilize weather data in your applications, get WeatherStack today!


Why should my application use the WeatherStack API, and what does it entail?

Across all major programming languages, WeatherStack API is a top-tier weather REST API service that provides historical and real-time weather data. Applications needing weather data integration might choose it since it rapidly gives reliable weather information for any area.

What is the process for beginning to use WeatherStack API?

WeatherStack API is easy to use and get started with. You must visit the official website, create a free account, and get your API Access Key from the dashboard. You can begin using meteorological data for your application when you receive your API key api key for a weather app.

Which platforms is Delphi FireMonkey compatible with for cross-platform applications?

With only one codebase, Delphi FireMonkey enables you to target several platforms, such as Windows, macOS, Linux, iOS, and Android. Without having to create platform-specific apps, developers can use this adaptability to make their weather app using api available to a wider audience.

How can you enhance application development productivity using Delphi FireMonkey?

When compared to conventional development methods, Delphi FireMonkey provides a five-fold increase in productivity. Developers may quickly design and create completely functional apps with its vast library of components, greatly cutting down on time-to-market.

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