function getCountryName(countryCode) {
fetch("./countryCode.json")
  .then((res) => {
    return res.json();
  })
  .then((isoCountries) => {
      console.log(countryCode)
      console.log(isoCountries);
      console.log(isoCountries.countryCode);
    if (isoCountries.countryCode) {
      return isoCountries.countryCode;
    } else {
      return countryCode;
    }
  });
} Output Below ->
IN (country code for india)
Object { AF: "Afghanistan", AX: "Aland Islands", AL: "Albania", DZ: "Algeria", AS: "American Samoa", AD: "Andorra", AO: "Angola", AI: "Anguilla", AQ: "Antarctica", AG: "Antigua And Barbuda", … }
undefined
