We will replace and add more option data dynamically to our currency converter with JavaScript. JavaScript currency functionalityThe JavaScript currency functionality will have two key parts:Getting the currency code, currency name, and flag from the REST countries APIGetting conversion rate from the Exchange Rate APIREST countries APIThe REST countries API provides an API with the endpoint https://restcountries.com/v3.1/all. In our case, we want the country flag, currency name, and currency code. code } - ${ currency . The option text will be the currency flag, currency code, and currency name separated by a hyphen.