RestCountries has been the go-to API for country data since 2013. It's free, open source, and covers the basics well. But as your app grows, you'll likely run into its limitations. What RestCountries Does Well RestCountries excels at basic country information: names, ISO codes, capitals, regions, flags, and population data. It's completely free, requires no API key, and has great community support. For simple country pickers or data enrichment, it's still a solid choice. Where RestCountries Falls Short No cities data. If you need city-level data — for autocomplete, store locators, or shipping forms — RestCountries can't help. You'd need a separate API. No exchange rates. RestCountries doesn't include live or even static exchange rate data. No IP geolocation. You can't detect a user's country from their IP address. No SLA or uptime guarantee. RestCountries runs on community infrastructure. If it goes down, there's no support channel. No rate limiting per key.…