It is using https://restcountries.com/ to gain all data about European Union countries. It is specifically designed to get sorted lists of density and population from European Union countries (top 10 of those), as well, you can search for desired European Union country by name, and it will bring you native name, area, population, and top-level domain for your country, keep in mind, it will only bring you data for European Union countries, otherwise, it will give you a bad request and statement, that your desired country is not in European Union.
You can download or clone the project and after a brief moment, you can open it. I would recommend using Visual Studio or Jet Brains Rider.
When you're this far, you just need to build and run it via an IDE of your choosing. See Bellow.
In Rider.
In Visual Studio
After this step, your browser should open up address https://localhost:7134/swagger/index.html and it should look like the image below.
In API you can view countries sorted by density, population or look up any country you like by name.
In this simple WEB API are implemented xUnit tests, which You can run as the image below shows.
