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The SELECT constants allow you to retrieve only the data fields you need instead of the full conversion, reducing payload size and improving performance. They work with both the SDK’s and the API. 
import { GetConversion, SELECT } from '@ip2geo/sdk'

const { data } = await GetConversion({
    conversionId: 'your-conversion-uuid',
    select: [
        SELECT.COUNTRY_NAME,
        SELECT.COUNTRY_CODE,
        SELECT.ASN_NAME
    ]
})

result = Ip2Geo.get_conversion(
    conversion_id: 'your-conversion-uuid',
    select: [
        Ip2Geo.select[:COUNTRY_NAME],
        Ip2Geo.select[:COUNTRY_CODE],
        Ip2Geo.select[:ASN_NAME]
    ]
)

result = ip2geo.get_conversion(
    conversion_id='your-conversion-uuid',
    select=[
        ip2geo.SELECT['COUNTRY_NAME'],
        ip2geo.SELECT['COUNTRY_CODE'],
        ip2geo.SELECT['ASN_NAME']
    ]
)

$result = Ip2Geo::getConversion(
    conversionId: 'your-conversion-uuid',
    select: [
        Ip2Geo::SELECT['COUNTRY_NAME'],
        Ip2Geo::SELECT['COUNTRY_CODE'],
        Ip2Geo::SELECT['ASN_NAME']
    ]
);
The full list of SELECT constant you can import and use when retrieving data:
ConstantValue
SELECT.IP'ip'
SELECT.TYPE'type'
SELECT.IS_EU'is_eu'
SELECT.CONTINENT_NAME'continent.name'
SELECT.CONTINENT_CODE'continent.code'
SELECT.CONTINENT_GEONAME_ID'continent.geoname_id'
SELECT.COUNTRY_NAME'continent.country.name'
SELECT.COUNTRY_CODE'continent.country.code'
SELECT.COUNTRY_GEONAME_ID'continent.country.geoname_id'
SELECT.COUNTRY_PHONE_CODE'continent.country.phone_code'
SELECT.COUNTRY_CAPITAL'continent.country.capital'
SELECT.COUNTRY_TLD'continent.country.tld'
SELECT.SUBDIVISION_NAME'continent.country.subdivision.name'
SELECT.SUBDIVISION_CODE'continent.country.subdivision.code'
SELECT.CITY_NAME'continent.country.city.name'
SELECT.CITY_GEONAME_ID'continent.country.city.geoname_id'
SELECT.CITY_LATITUDE'continent.country.city.latitude'
SELECT.CITY_LONGITUDE'continent.country.city.longitude'
SELECT.CITY_ACCURACY_RADIUS'continent.country.city.accuracy_radius'
SELECT.CITY_METRO_CODE'continent.country.city.metro_code'
SELECT.CITY_POSTAL_CODE'continent.country.city.postal_code'
SELECT.TIMEZONE_NAME'continent.country.city.timezone.name'
SELECT.TIMEZONE_TIME_NOW'continent.country.city.timezone.time_now'
SELECT.FLAG_IMG'continent.country.flag.img'
SELECT.FLAG_EMOJI'continent.country.flag.emoji'
SELECT.FLAG_EMOJI_UNICODE'continent.country.flag.emoji_unicode'
SELECT.CURRENCY_NAME'continent.country.currency.name'
SELECT.CURRENCY_CODE'continent.country.currency.code'
SELECT.CURRENCY_SYMBOL'continent.country.currency.symbol'
SELECT.REGISTERED_COUNTRY_NAME'registered_country.name'
SELECT.REGISTERED_COUNTRY_CODE'registered_country.code'
SELECT.REGISTERED_COUNTRY_GEONAME_ID'registered_country.geoname_id'
SELECT.ASN_NUMBER'asn.number'
SELECT.ASN_NAME'asn.name'
SELECT.COMPLETION_TIME_MILISECONDS'completion_time.miliseconds'
SELECT.COMPLETION_TIME_SECONDS'completion_time.seconds'

​
Raw Values

In case you are using the API instead of our SDKs to call it, here are the raw constants you can use for reference. 
const SELECT = {
    IP: 'ip',
    TYPE: 'type',
    IS_EU: 'is_eu',
    CONTINENT_NAME: 'continent.name',
    CONTINENT_CODE: 'continent.code',
    CONTINENT_GEONAME_ID: 'continent.geoname_id',
    COUNTRY_NAME: 'continent.country.name',
    COUNTRY_CODE: 'continent.country.code',
    COUNTRY_GEONAME_ID: 'continent.country.geoname_id',
    COUNTRY_PHONE_CODE: 'continent.country.phone_code',
    COUNTRY_CAPITAL: 'continent.country.capital',
    COUNTRY_TLD: 'continent.country.tld',
    SUBDIVISION_NAME: 'continent.country.subdivision.name',
    SUBDIVISION_CODE: 'continent.country.subdivision.code',
    CITY_NAME: 'continent.country.city.name',
    CITY_GEONAME_ID: 'continent.country.city.geoname_id',
    CITY_LATITUDE: 'continent.country.city.latitude',
    CITY_LONGITUDE: 'continent.country.city.longitude',
    CITY_ACCURACY_RADIUS: 'continent.country.city.accuracy_radius',
    CITY_METRO_CODE: 'continent.country.city.metro_code',
    CITY_POSTAL_CODE: 'continent.country.city.postal_code',
    TIMEZONE_NAME: 'continent.country.city.timezone.name',
    TIMEZONE_TIME_NOW: 'continent.country.city.timezone.time_now',
    FLAG_IMG: 'continent.country.flag.img',
    FLAG_EMOJI: 'continent.country.flag.emoji',
    FLAG_EMOJI_UNICODE: 'continent.country.flag.emoji_unicode',
    CURRENCY_NAME: 'continent.country.currency.name',
    CURRENCY_CODE: 'continent.country.currency.code',
    CURRENCY_SYMBOL: 'continent.country.currency.symbol',
    REGISTERED_COUNTRY_NAME: 'registered_country.name',
    REGISTERED_COUNTRY_CODE: 'registered_country.code',
    REGISTERED_COUNTRY_GEONAME_ID: 'registered_country.geoname_id',
    ASN_NUMBER: 'asn.number',
    ASN_NAME: 'asn.name',
    COMPLETION_TIME_MILISECONDS: 'completion_time.miliseconds',
    COMPLETION_TIME_SECONDS: 'completion_time.seconds'
}

SELECT = {
    IP: 'ip',
    TYPE: 'type',
    IS_EU: 'is_eu',
    CONTINENT_NAME: 'continent.name',
    CONTINENT_CODE: 'continent.code',
    CONTINENT_GEONAME_ID: 'continent.geoname_id',
    COUNTRY_NAME: 'continent.country.name',
    COUNTRY_CODE: 'continent.country.code',
    COUNTRY_GEONAME_ID: 'continent.country.geoname_id',
    COUNTRY_PHONE_CODE: 'continent.country.phone_code',
    COUNTRY_CAPITAL: 'continent.country.capital',
    COUNTRY_TLD: 'continent.country.tld',
    SUBDIVISION_NAME: 'continent.country.subdivision.name',
    SUBDIVISION_CODE: 'continent.country.subdivision.code',
    CITY_NAME: 'continent.country.city.name',
    CITY_GEONAME_ID: 'continent.country.city.geoname_id',
    CITY_LATITUDE: 'continent.country.city.latitude',
    CITY_LONGITUDE: 'continent.country.city.longitude',
    CITY_ACCURACY_RADIUS: 'continent.country.city.accuracy_radius',
    CITY_METRO_CODE: 'continent.country.city.metro_code',
    CITY_POSTAL_CODE: 'continent.country.city.postal_code',
    TIMEZONE_NAME: 'continent.country.city.timezone.name',
    TIMEZONE_TIME_NOW: 'continent.country.city.timezone.time_now',
    FLAG_IMG: 'continent.country.flag.img',
    FLAG_EMOJI: 'continent.country.flag.emoji',
    FLAG_EMOJI_UNICODE: 'continent.country.flag.emoji_unicode',
    CURRENCY_NAME: 'continent.country.currency.name',
    CURRENCY_CODE: 'continent.country.currency.code',
    CURRENCY_SYMBOL: 'continent.country.currency.symbol',
    REGISTERED_COUNTRY_NAME: 'registered_country.name',
    REGISTERED_COUNTRY_CODE: 'registered_country.code',
    REGISTERED_COUNTRY_GEONAME_ID: 'registered_country.geoname_id',
    ASN_NUMBER: 'asn.number',
    ASN_NAME: 'asn.name',
    COMPLETION_TIME_MILISECONDS: 'completion_time.miliseconds',
    COMPLETION_TIME_SECONDS: 'completion_time.seconds'
}