Tutorials, guides, and best practices for integrating geographic data into your applications using CountryDataAPI.
Step-by-step guide to building a country selector dropdown in React using CountryDataAPI. Includes code examples with useState, useEffect, and Axios.
Everything developers need to know about ISO 3166 country codes (alpha-2, alpha-3, numeric). How to use them with CountryDataAPI.
Learn how to implement zip code lookup and validation using CountryDataAPI's postal codes endpoint. JavaScript and Python examples included.
How to build dynamic address forms that cascade from country → state → city using CountryDataAPI. Works with React, Vue, and vanilla JS.
Complete reference for all ISO 4217 currency codes used in international finance. Learn what they mean, how to use them in APIs, and download the full list of 180+ active currencies.
Reference guide to international country phone codes (ITU-T E.164). Learn how dialing codes work, common pitfalls, and how to fetch them programmatically via REST API.
Reference guide to postal code formats around the world. Learn how zip codes vary by country, common validation patterns, and how to fetch them via REST API.
Learn how country timezones work, why one country can have multiple timezones, common DST pitfalls, and how to fetch timezone data programmatically via REST API.
Learn how to detect a user country, look up its official languages, and serve the right content using the Country Data API. Step-by-step with code examples.
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