Get information about countries via a RESTful API (Node.JS Version)
https://restcountries.herokuapp.com/api/v1
https://restcountries.herokuapp.com/api/v1/region/:region_name
example : https://restcountries.herokuapp.com/api/v1/region/asia
https://restcountries.herokuapp.com/api/v1/subregion/:subregion_name
example : [https://restcountries.herokuapp.com/api/v1/subregion/Northern Europe](https://restcountries.herokuapp.com/api/v1/subregion/Northern Europe)
https://restcountries.herokuapp.com/api/v1/currency/:current_code
example : https://restcountries.herokuapp.com/api/v1/currency/IDR
https://restcountries.herokuapp.com/api/v1/callingcode/:calling_code
example : https://restcountries.herokuapp.com/api/v1/callingcode/60