I have a form in my mobile app for shipping information. I am looking for REST API to get countries and its related cities.
I found only an API:
How can I get cities for each country ?
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I have developed an online service called GeoDB that does this and more. To your specific question, try the following requests:
List of all countries
List of cities, filtered for United States, Spain, and France
For more info and docs, check out the portal site.