--- title: Localization API description: The APIs for localizing your extension. api_version: 2026-04 api_name: checkout-ui-extensions source_url: html: >- https://shopify.dev/docs/api/checkout-ui-extensions/latest/target-apis/platform-apis/localization-api md: >- https://shopify.dev/docs/api/checkout-ui-extensions/latest/target-apis/platform-apis/localization-api.md --- # Localization API The APIs for localizing your extension. ### Support Targets (33) ### Supported targets * purchase.​address-autocomplete.​format-suggestion * purchase.​address-autocomplete.​suggest * purchase.​checkout.​actions.​render-before * purchase.​checkout.​block.​render * purchase.​checkout.​cart-line-item.​render-after * purchase.​checkout.​cart-line-list.​render-after * purchase.​checkout.​chat.​render * purchase.​checkout.​contact.​render-after * purchase.​checkout.​delivery-address.​render-after * purchase.​checkout.​delivery-address.​render-before * purchase.​checkout.​footer.​render-after * purchase.​checkout.​header.​render-after * purchase.​checkout.​payment-method-list.​render-after * purchase.​checkout.​payment-method-list.​render-before * purchase.​checkout.​pickup-location-list.​render-after * purchase.​checkout.​pickup-location-list.​render-before * purchase.​checkout.​pickup-location-option-item.​render-after * purchase.​checkout.​pickup-point-list.​render-after * purchase.​checkout.​pickup-point-list.​render-before * purchase.​checkout.​reductions.​render-after * purchase.​checkout.​reductions.​render-before * purchase.​checkout.​shipping-option-item.​details.​render * purchase.​checkout.​shipping-option-item.​render-after * purchase.​checkout.​shipping-option-list.​render-after * purchase.​checkout.​shipping-option-list.​render-before * purchase.​thank-you.​announcement.​render * purchase.​thank-you.​block.​render * purchase.​thank-you.​cart-line-item.​render-after * purchase.​thank-you.​cart-line-list.​render-after * purchase.​thank-you.​chat.​render * purchase.​thank-you.​customer-information.​render-after * purchase.​thank-you.​footer.​render-after * purchase.​thank-you.​header.​render-after ## StandardApi The base API object provided to `purchase` extension targets. * **i18n** **I18n** **required** Utilities for translating strings, formatting currencies, numbers, and dates according to the buyer's locale. Use alongside [`localization`](https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/localization) to build fully localized extensions. * **localization** **Localization** **required** The buyer's language, country, currency, and timezone context. For formatting and translation helpers, use the [`i18n`](https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/localization#standardapi-propertydetail-i18n) object instead. ### I18n Utilities for translating strings, formatting currencies, numbers, and dates according to the buyer's locale. Use the I18n API alongside the Localization API to build fully localized extensions. * formatCurrency Returns a localized currency value. This function behaves like the standard \`Intl.NumberFormat()\` with a style of \`currency\` applied. It uses the buyer's locale by default. ```ts (number: number | bigint, options?: { inExtensionLocale?: boolean; } & NumberFormatOptions) => string ``` * formatDate Returns a localized date value. This function behaves like the standard \[\`Intl.DateTimeFormat()\`]\(https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global\_Objects/Intl/DateTimeFormat) and uses the buyer's locale by default. Formatting \[options]\(https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global\_Objects/Intl/DateTimeFormat#using\_options) can be passed in as options. ```ts (date: Date, options?: { inExtensionLocale?: boolean; } & DateTimeFormatOptions) => string ``` * formatNumber Returns a localized number. This function behaves like the standard \`Intl.NumberFormat()\` with a style of \`decimal\` applied. It uses the buyer's locale by default. ```ts (number: number | bigint, options?: { inExtensionLocale?: boolean; } & NumberFormatOptions) => string ``` * translate Returns translated content in the buyer's locale, as supported by the extension. - \`options.count\` is a special numeric value used in pluralization. - The other option keys and values are treated as replacements for interpolation. - If the replacements are all primitives, then \`translate()\` returns a single string. - If replacements contain UI components, then \`translate()\` returns an array of elements. ```ts I18nTranslate ``` ### I18nTranslate Translates a key from your extension's locale files into a localized string. Supports interpolation with placeholder replacements and pluralization via the special \`count\` option. ### Localization The buyer's language, country, currency, and timezone context. Use this to adapt your extension to the buyer's region and display localized content. * country The country context of the checkout, carried over from the cart. It updates when the buyer changes their shipping address country. Use this value to display region-specific content such as local support information or regional policies. The value is \`undefined\` if the buyer's country is unknown. ```ts SubscribableSignalLike ``` * currency The currency that the buyer sees for money amounts in the checkout. Use this value to format prices and totals in the buyer's expected currency. ```ts SubscribableSignalLike ``` * extensionLanguage The best available language match for your extension based on the buyer's language. If the buyer's language is \`'fr-CA'\` but your extension supports only \`'fr'\`, this returns \`'fr'\`. If your extension doesn't support any variant of the buyer's language, this falls back to your extension's default locale (the \`.default.json\` translation file). Use this value to load the correct translation file for your extension. ```ts SubscribableSignalLike ``` * language The language the buyer sees in the checkout. This reflects the language selected by the buyer or determined by their browser settings, and might differ from the languages your extension supports. ```ts SubscribableSignalLike ``` * market The \[market]\(/docs/apps/build/markets) context of the checkout, carried over from the cart context. Markets group countries and regions with shared pricing, languages, and domains. It updates when the buyer changes the country of their shipping address. The value is \`undefined\` if the market is unknown. > Caution: Deprecated as of version \`2025-04\`. Merchants now manage which extensions load for each market, so extensions no longer need to check this value. ```ts SubscribableSignalLike ``` * timezone The buyer's time zone, based on their browser or account settings. Use this value to format dates and times relative to the buyer's local time. ```ts SubscribableSignalLike ``` ### SubscribableSignalLike Represents a reactive signal interface that provides both immediate value access and subscription-based updates. Enables real-time synchronization with changing data through the observer pattern. This interface extends \`ReadonlySignalLike\` with deprecated fields that are still supported for backwards compatibility. * current The current value of the signal. Equivalent to \`.value\`, accessing this property subscribes to changes when used in a reactive context. ```ts T ``` * destroy Cleans up the subscription and releases any resources held by this signal. After calling \`destroy()\`, the signal stops receiving updates from the main thread. ```ts () => Promise ``` * subscribe Subscribes to value changes and calls the provided function whenever the value updates. Returns an unsubscribe function to clean up the subscription. Use to automatically react to changes in the signal's value. ```ts (fn: (value: T) => void) => () => void ``` * value The current value of the signal. This property provides immediate access to the current value without requiring subscription setup. Use for one-time value checks or initial setup. ```ts T ``` ### Country A buyer's country, identified by its ISO country code. * isoCode The two-letter country code in \[ISO 3166-1 alpha-2]\(https://en.wikipedia.org/wiki/ISO\_3166-1\_alpha-2) format. ```ts CountryCode ``` ### CountryCode ```ts 'AC' | 'AD' | 'AE' | 'AF' | 'AG' | 'AI' | 'AL' | 'AM' | 'AN' | 'AO' | 'AR' | 'AT' | 'AU' | 'AW' | 'AX' | 'AZ' | 'BA' | 'BB' | 'BD' | 'BE' | 'BF' | 'BG' | 'BH' | 'BI' | 'BJ' | 'BL' | 'BM' | 'BN' | 'BO' | 'BQ' | 'BR' | 'BS' | 'BT' | 'BV' | 'BW' | 'BY' | 'BZ' | 'CA' | 'CC' | 'CD' | 'CF' | 'CG' | 'CH' | 'CI' | 'CK' | 'CL' | 'CM' | 'CN' | 'CO' | 'CR' | 'CU' | 'CV' | 'CW' | 'CX' | 'CY' | 'CZ' | 'DE' | 'DJ' | 'DK' | 'DM' | 'DO' | 'DZ' | 'EC' | 'EE' | 'EG' | 'EH' | 'ER' | 'ES' | 'ET' | 'FI' | 'FJ' | 'FK' | 'FO' | 'FR' | 'GA' | 'GB' | 'GD' | 'GE' | 'GF' | 'GG' | 'GH' | 'GI' | 'GL' | 'GM' | 'GN' | 'GP' | 'GQ' | 'GR' | 'GS' | 'GT' | 'GW' | 'GY' | 'HK' | 'HM' | 'HN' | 'HR' | 'HT' | 'HU' | 'ID' | 'IE' | 'IL' | 'IM' | 'IN' | 'IO' | 'IQ' | 'IR' | 'IS' | 'IT' | 'JE' | 'JM' | 'JO' | 'JP' | 'KE' | 'KG' | 'KH' | 'KI' | 'KM' | 'KN' | 'KP' | 'KR' | 'KW' | 'KY' | 'KZ' | 'LA' | 'LB' | 'LC' | 'LI' | 'LK' | 'LR' | 'LS' | 'LT' | 'LU' | 'LV' | 'LY' | 'MA' | 'MC' | 'MD' | 'ME' | 'MF' | 'MG' | 'MK' | 'ML' | 'MM' | 'MN' | 'MO' | 'MQ' | 'MR' | 'MS' | 'MT' | 'MU' | 'MV' | 'MW' | 'MX' | 'MY' | 'MZ' | 'NA' | 'NC' | 'NE' | 'NF' | 'NG' | 'NI' | 'NL' | 'NO' | 'NP' | 'NR' | 'NU' | 'NZ' | 'OM' | 'PA' | 'PE' | 'PF' | 'PG' | 'PH' | 'PK' | 'PL' | 'PM' | 'PN' | 'PS' | 'PT' | 'PY' | 'QA' | 'RE' | 'RO' | 'RS' | 'RU' | 'RW' | 'SA' | 'SB' | 'SC' | 'SD' | 'SE' | 'SG' | 'SH' | 'SI' | 'SJ' | 'SK' | 'SL' | 'SM' | 'SN' | 'SO' | 'SR' | 'SS' | 'ST' | 'SV' | 'SX' | 'SY' | 'SZ' | 'TA' | 'TC' | 'TD' | 'TF' | 'TG' | 'TH' | 'TJ' | 'TK' | 'TL' | 'TM' | 'TN' | 'TO' | 'TR' | 'TT' | 'TV' | 'TW' | 'TZ' | 'UA' | 'UG' | 'UM' | 'US' | 'UY' | 'UZ' | 'VA' | 'VC' | 'VE' | 'VG' | 'VN' | 'VU' | 'WF' | 'WS' | 'XK' | 'YE' | 'YT' | 'ZA' | 'ZM' | 'ZW' | 'ZZ' ``` ### Currency * isoCode The three-letter currency code in \[ISO 4217]\(https://en.wikipedia.org/wiki/ISO\_4217) format, such as \`'USD'\`, \`'EUR'\`, or \`'CAD'\`. ```ts CurrencyCode ``` ### CurrencyCode ```ts 'AED' | 'AFN' | 'ALL' | 'AMD' | 'ANG' | 'AOA' | 'ARS' | 'AUD' | 'AWG' | 'AZN' | 'BAM' | 'BBD' | 'BDT' | 'BGN' | 'BHD' | 'BIF' | 'BMD' | 'BND' | 'BOB' | 'BOV' | 'BRL' | 'BSD' | 'BTN' | 'BWP' | 'BYN' | 'BZD' | 'CAD' | 'CDF' | 'CHE' | 'CHF' | 'CHW' | 'CLF' | 'CLP' | 'CNY' | 'COP' | 'COU' | 'CRC' | 'CUC' | 'CUP' | 'CVE' | 'CZK' | 'DJF' | 'DKK' | 'DOP' | 'DZD' | 'EGP' | 'ERN' | 'ETB' | 'EUR' | 'FJD' | 'FKP' | 'GBP' | 'GEL' | 'GHS' | 'GIP' | 'GMD' | 'GNF' | 'GTQ' | 'GYD' | 'HKD' | 'HNL' | 'HRK' | 'HTG' | 'HUF' | 'IDR' | 'ILS' | 'INR' | 'IQD' | 'IRR' | 'ISK' | 'JMD' | 'JOD' | 'JPY' | 'KES' | 'KGS' | 'KHR' | 'KMF' | 'KPW' | 'KRW' | 'KWD' | 'KYD' | 'KZT' | 'LAK' | 'LBP' | 'LKR' | 'LRD' | 'LSL' | 'LYD' | 'MAD' | 'MDL' | 'MGA' | 'MKD' | 'MMK' | 'MNT' | 'MOP' | 'MRU' | 'MUR' | 'MVR' | 'MWK' | 'MXN' | 'MXV' | 'MYR' | 'MZN' | 'NAD' | 'NGN' | 'NIO' | 'NOK' | 'NPR' | 'NZD' | 'OMR' | 'PAB' | 'PEN' | 'PGK' | 'PHP' | 'PKR' | 'PLN' | 'PYG' | 'QAR' | 'RON' | 'RSD' | 'RUB' | 'RWF' | 'SAR' | 'SBD' | 'SCR' | 'SDG' | 'SEK' | 'SGD' | 'SHP' | 'SLL' | 'SOS' | 'SRD' | 'SSP' | 'STN' | 'SVC' | 'SYP' | 'SZL' | 'THB' | 'TJS' | 'TMT' | 'TND' | 'TOP' | 'TRY' | 'TTD' | 'TWD' | 'TZS' | 'UAH' | 'UGX' | 'USD' | 'USN' | 'UYI' | 'UYU' | 'UYW' | 'UZS' | 'VES' | 'VND' | 'VUV' | 'WST' | 'XAF' | 'XAG' | 'XAU' | 'XBA' | 'XBB' | 'XBC' | 'XBD' | 'XCD' | 'XDR' | 'XOF' | 'XPD' | 'XPF' | 'XPT' | 'XSU' | 'XTS' | 'XUA' | 'XXX' | 'YER' | 'ZAR' | 'ZMW' | 'ZWL' ``` ### Language * isoCode The \[BCP-47]\(https://en.wikipedia.org/wiki/IETF\_language\_tag) language tag that identifies the language. This is a standardized code that might include a base language and an optional region subtag separated by a dash. For example, \`'en'\` represents English and \`'en-US'\` represents English as used in the United States. The region subtag follows the \[ISO 3166-1 alpha-2]\(https://en.wikipedia.org/wiki/ISO\_3166-1\_alpha-2) standard. ```ts string ``` ### Market A \[Shopify Market]\(/docs/apps/build/markets) that represents a group of one or more regions for international selling. * handle The human-readable, shop-scoped identifier for the market, such as \`'us'\` or \`'eu'\`. Merchants define these handles when configuring \[Shopify Markets]\(/docs/apps/build/markets). ```ts string ``` * id A globally-unique identifier for the market in the format \`gid://shopify/Market/\\`. ```ts string ``` ### Timezone ```ts 'Africa/Abidjan' | 'Africa/Algiers' | 'Africa/Bissau' | 'Africa/Cairo' | 'Africa/Casablanca' | 'Africa/Ceuta' | 'Africa/El_Aaiun' | 'Africa/Johannesburg' | 'Africa/Juba' | 'Africa/Khartoum' | 'Africa/Lagos' | 'Africa/Maputo' | 'Africa/Monrovia' | 'Africa/Nairobi' | 'Africa/Ndjamena' | 'Africa/Sao_Tome' | 'Africa/Tripoli' | 'Africa/Tunis' | 'Africa/Windhoek' | 'America/Adak' | 'America/Anchorage' | 'America/Araguaina' | 'America/Argentina/Buenos_Aires' | 'America/Argentina/Catamarca' | 'America/Argentina/Cordoba' | 'America/Argentina/Jujuy' | 'America/Argentina/La_Rioja' | 'America/Argentina/Mendoza' | 'America/Argentina/Rio_Gallegos' | 'America/Argentina/Salta' | 'America/Argentina/San_Juan' | 'America/Argentina/San_Luis' | 'America/Argentina/Tucuman' | 'America/Argentina/Ushuaia' | 'America/Asuncion' | 'America/Bahia' | 'America/Bahia_Banderas' | 'America/Barbados' | 'America/Belem' | 'America/Belize' | 'America/Boa_Vista' | 'America/Bogota' | 'America/Boise' | 'America/Cambridge_Bay' | 'America/Campo_Grande' | 'America/Cancun' | 'America/Caracas' | 'America/Cayenne' | 'America/Chicago' | 'America/Chihuahua' | 'America/Costa_Rica' | 'America/Cuiaba' | 'America/Danmarkshavn' | 'America/Dawson' | 'America/Dawson_Creek' | 'America/Denver' | 'America/Detroit' | 'America/Edmonton' | 'America/Eirunepe' | 'America/El_Salvador' | 'America/Fort_Nelson' | 'America/Fortaleza' | 'America/Glace_Bay' | 'America/Goose_Bay' | 'America/Grand_Turk' | 'America/Guatemala' | 'America/Guayaquil' | 'America/Guyana' | 'America/Halifax' | 'America/Havana' | 'America/Hermosillo' | 'America/Indiana/Indianapolis' | 'America/Indiana/Knox' | 'America/Indiana/Marengo' | 'America/Indiana/Petersburg' | 'America/Indiana/Tell_City' | 'America/Indiana/Vevay' | 'America/Indiana/Vincennes' | 'America/Indiana/Winamac' | 'America/Inuvik' | 'America/Iqaluit' | 'America/Jamaica' | 'America/Juneau' | 'America/Kentucky/Louisville' | 'America/Kentucky/Monticello' | 'America/La_Paz' | 'America/Lima' | 'America/Los_Angeles' | 'America/Maceio' | 'America/Managua' | 'America/Manaus' | 'America/Martinique' | 'America/Matamoros' | 'America/Mazatlan' | 'America/Menominee' | 'America/Merida' | 'America/Metlakatla' | 'America/Mexico_City' | 'America/Miquelon' | 'America/Moncton' | 'America/Monterrey' | 'America/Montevideo' | 'America/New_York' | 'America/Nipigon' | 'America/Nome' | 'America/Noronha' | 'America/North_Dakota/Beulah' | 'America/North_Dakota/Center' | 'America/North_Dakota/New_Salem' | 'America/Nuuk' | 'America/Ojinaga' | 'America/Panama' | 'America/Pangnirtung' | 'America/Paramaribo' | 'America/Phoenix' | 'America/Port-au-Prince' | 'America/Porto_Velho' | 'America/Puerto_Rico' | 'America/Punta_Arenas' | 'America/Rainy_River' | 'America/Rankin_Inlet' | 'America/Recife' | 'America/Regina' | 'America/Resolute' | 'America/Rio_Branco' | 'America/Santarem' | 'America/Santiago' | 'America/Santo_Domingo' | 'America/Sao_Paulo' | 'America/Scoresbysund' | 'America/Sitka' | 'America/St_Johns' | 'America/Swift_Current' | 'America/Tegucigalpa' | 'America/Thule' | 'America/Thunder_Bay' | 'America/Tijuana' | 'America/Toronto' | 'America/Vancouver' | 'America/Whitehorse' | 'America/Winnipeg' | 'America/Yakutat' | 'America/Yellowknife' | 'Antarctica/Casey' | 'Antarctica/Davis' | 'Antarctica/Macquarie' | 'Antarctica/Mawson' | 'Antarctica/Palmer' | 'Antarctica/Rothera' | 'Antarctica/Troll' | 'Antarctica/Vostok' | 'Asia/Almaty' | 'Asia/Amman' | 'Asia/Anadyr' | 'Asia/Aqtau' | 'Asia/Aqtobe' | 'Asia/Ashgabat' | 'Asia/Atyrau' | 'Asia/Baghdad' | 'Asia/Baku' | 'Asia/Bangkok' | 'Asia/Barnaul' | 'Asia/Beirut' | 'Asia/Bishkek' | 'Asia/Brunei' | 'Asia/Chita' | 'Asia/Choibalsan' | 'Asia/Colombo' | 'Asia/Damascus' | 'Asia/Dhaka' | 'Asia/Dili' | 'Asia/Dubai' | 'Asia/Dushanbe' | 'Asia/Famagusta' | 'Asia/Gaza' | 'Asia/Hebron' | 'Asia/Ho_Chi_Minh' | 'Asia/Hong_Kong' | 'Asia/Hovd' | 'Asia/Irkutsk' | 'Asia/Jakarta' | 'Asia/Jayapura' | 'Asia/Jerusalem' | 'Asia/Kabul' | 'Asia/Kamchatka' | 'Asia/Karachi' | 'Asia/Kathmandu' | 'Asia/Khandyga' | 'Asia/Kolkata' | 'Asia/Krasnoyarsk' | 'Asia/Kuala_Lumpur' | 'Asia/Kuching' | 'Asia/Macau' | 'Asia/Magadan' | 'Asia/Makassar' | 'Asia/Manila' | 'Asia/Nicosia' | 'Asia/Novokuznetsk' | 'Asia/Novosibirsk' | 'Asia/Omsk' | 'Asia/Oral' | 'Asia/Pontianak' | 'Asia/Pyongyang' | 'Asia/Qatar' | 'Asia/Qostanay' | 'Asia/Qyzylorda' | 'Asia/Riyadh' | 'Asia/Sakhalin' | 'Asia/Samarkand' | 'Asia/Seoul' | 'Asia/Shanghai' | 'Asia/Singapore' | 'Asia/Srednekolymsk' | 'Asia/Taipei' | 'Asia/Tashkent' | 'Asia/Tbilisi' | 'Asia/Tehran' | 'Asia/Thimphu' | 'Asia/Tokyo' | 'Asia/Tomsk' | 'Asia/Ulaanbaatar' | 'Asia/Urumqi' | 'Asia/Ust-Nera' | 'Asia/Vladivostok' | 'Asia/Yakutsk' | 'Asia/Yangon' | 'Asia/Yekaterinburg' | 'Asia/Yerevan' | 'Atlantic/Azores' | 'Atlantic/Bermuda' | 'Atlantic/Canary' | 'Atlantic/Cape_Verde' | 'Atlantic/Faroe' | 'Atlantic/Madeira' | 'Atlantic/Reykjavik' | 'Atlantic/South_Georgia' | 'Atlantic/Stanley' | 'Australia/Adelaide' | 'Australia/Brisbane' | 'Australia/Broken_Hill' | 'Australia/Darwin' | 'Australia/Eucla' | 'Australia/Hobart' | 'Australia/Lindeman' | 'Australia/Lord_Howe' | 'Australia/Melbourne' | 'Australia/Perth' | 'Australia/Sydney' | 'CET' | 'CST6CDT' | 'EET' | 'EST' | 'EST5EDT' | 'Etc/GMT' | 'Etc/GMT-1' | 'Etc/GMT-10' | 'Etc/GMT-11' | 'Etc/GMT-12' | 'Etc/GMT-13' | 'Etc/GMT-14' | 'Etc/GMT-2' | 'Etc/GMT-3' | 'Etc/GMT-4' | 'Etc/GMT-5' | 'Etc/GMT-6' | 'Etc/GMT-7' | 'Etc/GMT-8' | 'Etc/GMT-9' | 'Etc/GMT+1' | 'Etc/GMT+10' | 'Etc/GMT+11' | 'Etc/GMT+12' | 'Etc/GMT+2' | 'Etc/GMT+3' | 'Etc/GMT+4' | 'Etc/GMT+5' | 'Etc/GMT+6' | 'Etc/GMT+7' | 'Etc/GMT+8' | 'Etc/GMT+9' | 'Etc/UTC' | 'Europe/Amsterdam' | 'Europe/Andorra' | 'Europe/Astrakhan' | 'Europe/Athens' | 'Europe/Belgrade' | 'Europe/Berlin' | 'Europe/Brussels' | 'Europe/Bucharest' | 'Europe/Budapest' | 'Europe/Chisinau' | 'Europe/Copenhagen' | 'Europe/Dublin' | 'Europe/Gibraltar' | 'Europe/Helsinki' | 'Europe/Istanbul' | 'Europe/Kaliningrad' | 'Europe/Kiev' | 'Europe/Kirov' | 'Europe/Lisbon' | 'Europe/London' | 'Europe/Luxembourg' | 'Europe/Madrid' | 'Europe/Malta' | 'Europe/Minsk' | 'Europe/Monaco' | 'Europe/Moscow' | 'Europe/Oslo' | 'Europe/Paris' | 'Europe/Prague' | 'Europe/Riga' | 'Europe/Rome' | 'Europe/Samara' | 'Europe/Saratov' | 'Europe/Simferopol' | 'Europe/Sofia' | 'Europe/Stockholm' | 'Europe/Tallinn' | 'Europe/Tirane' | 'Europe/Ulyanovsk' | 'Europe/Uzhgorod' | 'Europe/Vienna' | 'Europe/Vilnius' | 'Europe/Volgograd' | 'Europe/Warsaw' | 'Europe/Zaporozhye' | 'Europe/Zurich' | 'HST' | 'Indian/Chagos' | 'Indian/Christmas' | 'Indian/Cocos' | 'Indian/Kerguelen' | 'Indian/Mahe' | 'Indian/Maldives' | 'Indian/Mauritius' | 'Indian/Reunion' | 'MET' | 'MST' | 'MST7MDT' | 'Pacific/Apia' | 'Pacific/Auckland' | 'Pacific/Bougainville' | 'Pacific/Chatham' | 'Pacific/Chuuk' | 'Pacific/Easter' | 'Pacific/Efate' | 'Pacific/Fakaofo' | 'Pacific/Fiji' | 'Pacific/Funafuti' | 'Pacific/Galapagos' | 'Pacific/Gambier' | 'Pacific/Guadalcanal' | 'Pacific/Guam' | 'Pacific/Honolulu' | 'Pacific/Kanton' | 'Pacific/Kiritimati' | 'Pacific/Kosrae' | 'Pacific/Kwajalein' | 'Pacific/Majuro' | 'Pacific/Marquesas' | 'Pacific/Nauru' | 'Pacific/Niue' | 'Pacific/Norfolk' | 'Pacific/Noumea' | 'Pacific/Pago_Pago' | 'Pacific/Palau' | 'Pacific/Pitcairn' | 'Pacific/Pohnpei' | 'Pacific/Port_Moresby' | 'Pacific/Rarotonga' | 'Pacific/Tahiti' | 'Pacific/Tarawa' | 'Pacific/Tongatapu' | 'Pacific/Wake' | 'Pacific/Wallis' | 'PST8PDT' | 'WET' ``` ## use​Currency() Returns the currency of the checkout. ### Returns * **Currency** ### ### Currency * **isoCode** **CurrencyCode** The three-letter currency code in [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) format, such as `'USD'`, `'EUR'`, or `'CAD'`. ## use​Extension​Language() Returns the buyer's language, as supported by the extension. ### Returns * **Language** ### ### Language * **isoCode** **string** The [BCP-47](https://en.wikipedia.org/wiki/IETF_language_tag) language tag that identifies the language. This is a standardized code that might include a base language and an optional region subtag separated by a dash. For example, `'en'` represents English and `'en-US'` represents English as used in the United States. The region subtag follows the [ISO 3166-1 alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2) standard. ## use​Language() Returns the current language of the checkout, and automatically re-renders your component if the language changes. ### Returns * **Language** ### ### Language * **isoCode** **string** The [BCP-47](https://en.wikipedia.org/wiki/IETF_language_tag) language tag that identifies the language. This is a standardized code that might include a base language and an optional region subtag separated by a dash. For example, `'en'` represents English and `'en-US'` represents English as used in the United States. The region subtag follows the [ISO 3166-1 alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2) standard. ## use​Localization​Country() Returns the country of the checkout, and automatically re-renders your component if the country changes. ### Returns * **Country | undefined** ## use​Localization​Market() Returns the market of the checkout, and automatically re-renders your component if it changes. ### Returns * **Market | undefined** ## use​Timezone() Returns the time zone of the checkout, and automatically re-renders your component if the time zone changes. ### Returns * **"Africa/Abidjan" | "Africa/Algiers" | "Africa/Bissau" | "Africa/Cairo" | "Africa/Casablanca" | "Africa/Ceuta" | "Africa/El\_Aaiun" | "Africa/Johannesburg" | "Africa/Juba" | "Africa/Khartoum" | "Africa/Lagos" | "Africa/Maputo" | "Africa/Monrovia" | "Africa/Nairobi" | "Africa/Ndjamena" | "Africa/Sao\_Tome" | "Africa/Tripoli" | "Africa/Tunis" | "Africa/Windhoek" | "America/Adak" | "America/Anchorage" | "America/Araguaina" | "America/Argentina/Buenos\_Aires" | "America/Argentina/Catamarca" | "America/Argentina/Cordoba" | "America/Argentina/Jujuy" | "America/Argentina/La\_Rioja" | "America/Argentina/Mendoza" | "America/Argentina/Rio\_Gallegos" | "America/Argentina/Salta" | "America/Argentina/San\_Juan" | "America/Argentina/San\_Luis" | "America/Argentina/Tucuman" | "America/Argentina/Ushuaia" | "America/Asuncion" | "America/Bahia" | "America/Bahia\_Banderas" | "America/Barbados" | "America/Belem" | "America/Belize" | "America/Boa\_Vista" | "America/Bogota" | "America/Boise" | "America/Cambridge\_Bay" | "America/Campo\_Grande" | "America/Cancun" | "America/Caracas" | "America/Cayenne" | "America/Chicago" | "America/Chihuahua" | "America/Costa\_Rica" | "America/Cuiaba" | "America/Danmarkshavn" | "America/Dawson" | "America/Dawson\_Creek" | "America/Denver" | "America/Detroit" | "America/Edmonton" | "America/Eirunepe" | "America/El\_Salvador" | "America/Fort\_Nelson" | "America/Fortaleza" | "America/Glace\_Bay" | "America/Goose\_Bay" | "America/Grand\_Turk" | "America/Guatemala" | "America/Guayaquil" | "America/Guyana" | "America/Halifax" | "America/Havana" | "America/Hermosillo" | "America/Indiana/Indianapolis" | "America/Indiana/Knox" | "America/Indiana/Marengo" | "America/Indiana/Petersburg" | "America/Indiana/Tell\_City" | "America/Indiana/Vevay" | "America/Indiana/Vincennes" | "America/Indiana/Winamac" | "America/Inuvik" | "America/Iqaluit" | "America/Jamaica" | "America/Juneau" | "America/Kentucky/Louisville" | "America/Kentucky/Monticello" | "America/La\_Paz" | "America/Lima" | "America/Los\_Angeles" | "America/Maceio" | "America/Managua" | "America/Manaus" | "America/Martinique" | "America/Matamoros" | "America/Mazatlan" | "America/Menominee" | "America/Merida" | "America/Metlakatla" | "America/Mexico\_City" | "America/Miquelon" | "America/Moncton" | "America/Monterrey" | "America/Montevideo" | "America/New\_York" | "America/Nipigon" | "America/Nome" | "America/Noronha" | "America/North\_Dakota/Beulah" | "America/North\_Dakota/Center" | "America/North\_Dakota/New\_Salem" | "America/Nuuk" | "America/Ojinaga" | "America/Panama" | "America/Pangnirtung" | "America/Paramaribo" | "America/Phoenix" | "America/Port-au-Prince" | "America/Porto\_Velho" | "America/Puerto\_Rico" | "America/Punta\_Arenas" | "America/Rainy\_River" | "America/Rankin\_Inlet" | "America/Recife" | "America/Regina" | "America/Resolute" | "America/Rio\_Branco" | "America/Santarem" | "America/Santiago" | "America/Santo\_Domingo" | "America/Sao\_Paulo" | "America/Scoresbysund" | "America/Sitka" | "America/St\_Johns" | "America/Swift\_Current" | "America/Tegucigalpa" | "America/Thule" | "America/Thunder\_Bay" | "America/Tijuana" | "America/Toronto" | "America/Vancouver" | "America/Whitehorse" | "America/Winnipeg" | "America/Yakutat" | "America/Yellowknife" | "Antarctica/Casey" | "Antarctica/Davis" | "Antarctica/Macquarie" | "Antarctica/Mawson" | "Antarctica/Palmer" | "Antarctica/Rothera" | "Antarctica/Troll" | "Antarctica/Vostok" | "Asia/Almaty" | "Asia/Amman" | "Asia/Anadyr" | "Asia/Aqtau" | "Asia/Aqtobe" | "Asia/Ashgabat" | "Asia/Atyrau" | "Asia/Baghdad" | "Asia/Baku" | "Asia/Bangkok" | "Asia/Barnaul" | "Asia/Beirut" | "Asia/Bishkek" | "Asia/Brunei" | "Asia/Chita" | "Asia/Choibalsan" | "Asia/Colombo" | "Asia/Damascus" | "Asia/Dhaka" | "Asia/Dili" | "Asia/Dubai" | "Asia/Dushanbe" | "Asia/Famagusta" | "Asia/Gaza" | "Asia/Hebron" | "Asia/Ho\_Chi\_Minh" | "Asia/Hong\_Kong" | "Asia/Hovd" | "Asia/Irkutsk" | "Asia/Jakarta" | "Asia/Jayapura" | "Asia/Jerusalem" | "Asia/Kabul" | "Asia/Kamchatka" | "Asia/Karachi" | "Asia/Kathmandu" | "Asia/Khandyga" | "Asia/Kolkata" | "Asia/Krasnoyarsk" | "Asia/Kuala\_Lumpur" | "Asia/Kuching" | "Asia/Macau" | "Asia/Magadan" | "Asia/Makassar" | "Asia/Manila" | "Asia/Nicosia" | "Asia/Novokuznetsk" | "Asia/Novosibirsk" | "Asia/Omsk" | "Asia/Oral" | "Asia/Pontianak" | "Asia/Pyongyang" | "Asia/Qatar" | "Asia/Qostanay" | "Asia/Qyzylorda" | "Asia/Riyadh" | "Asia/Sakhalin" | "Asia/Samarkand" | "Asia/Seoul" | "Asia/Shanghai" | "Asia/Singapore" | "Asia/Srednekolymsk" | "Asia/Taipei" | "Asia/Tashkent" | "Asia/Tbilisi" | "Asia/Tehran" | "Asia/Thimphu" | "Asia/Tokyo" | "Asia/Tomsk" | "Asia/Ulaanbaatar" | "Asia/Urumqi" | "Asia/Ust-Nera" | "Asia/Vladivostok" | "Asia/Yakutsk" | "Asia/Yangon" | "Asia/Yekaterinburg" | "Asia/Yerevan" | "Atlantic/Azores" | "Atlantic/Bermuda" | "Atlantic/Canary" | "Atlantic/Cape\_Verde" | "Atlantic/Faroe" | "Atlantic/Madeira" | "Atlantic/Reykjavik" | "Atlantic/South\_Georgia" | "Atlantic/Stanley" | "Australia/Adelaide" | "Australia/Brisbane" | "Australia/Broken\_Hill" | "Australia/Darwin" | "Australia/Eucla" | "Australia/Hobart" | "Australia/Lindeman" | "Australia/Lord\_Howe" | "Australia/Melbourne" | "Australia/Perth" | "Australia/Sydney" | "CET" | "CST6CDT" | "EET" | "EST" | "EST5EDT" | "Etc/GMT" | "Etc/GMT-1" | "Etc/GMT-10" | "Etc/GMT-11" | "Etc/GMT-12" | "Etc/GMT-13" | "Etc/GMT-14" | "Etc/GMT-2" | "Etc/GMT-3" | "Etc/GMT-4" | "Etc/GMT-5" | "Etc/GMT-6" | "Etc/GMT-7" | "Etc/GMT-8" | "Etc/GMT-9" | "Etc/GMT+1" | "Etc/GMT+10" | "Etc/GMT+11" | "Etc/GMT+12" | "Etc/GMT+2" | "Etc/GMT+3" | "Etc/GMT+4" | "Etc/GMT+5" | "Etc/GMT+6" | "Etc/GMT+7" | "Etc/GMT+8" | "Etc/GMT+9" | "Etc/UTC" | "Europe/Amsterdam" | "Europe/Andorra" | "Europe/Astrakhan" | "Europe/Athens" | "Europe/Belgrade" | "Europe/Berlin" | "Europe/Brussels" | "Europe/Bucharest" | "Europe/Budapest" | "Europe/Chisinau" | "Europe/Copenhagen" | "Europe/Dublin" | "Europe/Gibraltar" | "Europe/Helsinki" | "Europe/Istanbul" | "Europe/Kaliningrad" | "Europe/Kiev" | "Europe/Kirov" | "Europe/Lisbon" | "Europe/London" | "Europe/Luxembourg" | "Europe/Madrid" | "Europe/Malta" | "Europe/Minsk" | "Europe/Monaco" | "Europe/Moscow" | "Europe/Oslo" | "Europe/Paris" | "Europe/Prague" | "Europe/Riga" | "Europe/Rome" | "Europe/Samara" | "Europe/Saratov" | "Europe/Simferopol" | "Europe/Sofia" | "Europe/Stockholm" | "Europe/Tallinn" | "Europe/Tirane" | "Europe/Ulyanovsk" | "Europe/Uzhgorod" | "Europe/Vienna" | "Europe/Vilnius" | "Europe/Volgograd" | "Europe/Warsaw" | "Europe/Zaporozhye" | "Europe/Zurich" | "HST" | "Indian/Chagos" | "Indian/Christmas" | "Indian/Cocos" | "Indian/Kerguelen" | "Indian/Mahe" | "Indian/Maldives" | "Indian/Mauritius" | "Indian/Reunion" | "MET" | "MST" | "MST7MDT" | "Pacific/Apia" | "Pacific/Auckland" | "Pacific/Bougainville" | "Pacific/Chatham" | "Pacific/Chuuk" | "Pacific/Easter" | "Pacific/Efate" | "Pacific/Fakaofo" | "Pacific/Fiji" | "Pacific/Funafuti" | "Pacific/Galapagos" | "Pacific/Gambier" | "Pacific/Guadalcanal" | "Pacific/Guam" | "Pacific/Honolulu" | "Pacific/Kanton" | "Pacific/Kiritimati" | "Pacific/Kosrae" | "Pacific/Kwajalein" | "Pacific/Majuro" | "Pacific/Marquesas" | "Pacific/Nauru" | "Pacific/Niue" | "Pacific/Norfolk" | "Pacific/Noumea" | "Pacific/Pago\_Pago" | "Pacific/Palau" | "Pacific/Pitcairn" | "Pacific/Pohnpei" | "Pacific/Port\_Moresby" | "Pacific/Rarotonga" | "Pacific/Tahiti" | "Pacific/Tarawa" | "Pacific/Tongatapu" | "Pacific/Wake" | "Pacific/Wallis" | "PST8PDT" | "WET"** ## use​Translate() Returns the `I18nTranslate` interface used to translate strings. ### Returns * **I18nTranslate** ### ### I18nTranslateTranslates a key from your extension's locale files into a localized string. Supports interpolation with placeholder replacements and pluralization via the special `count` option. * **export interface I18nTranslate { ( key: string, options?: Record, ): ReplacementType extends string | number ? string : (string | ReplacementType)[]; }** Examples ### Examples * #### Translating strings ##### Description Define strings in JSON files for each locale and render them using \`translate()\`. See \[localizing UI extensions]\(/docs/apps/checkout/best-practices/localizing-ui-extensions) for more information. ##### Preact ```jsx /* See the locales/en.default.json tab for the translation keys and values for this example */ import '@shopify/ui-extensions/preact'; import {render} from 'preact'; export default function extension() { render(, document.body); } function Extension() { return ( {shopify.i18n.translate('welcomeMessage')} ); } ``` ##### locales/en.default.json ```json { "welcomeMessage": "Welcome to our store!" } ``` * #### Translating strings with pluralization ##### Description You can use the \`count\` option to get a pluralized string based on the current locale. See \[localizing UI extensions]\(/docs/apps/checkout/best-practices/localizing-ui-extensions) for more information. ##### Preact ```jsx /* See the locales/en.default.json tab for the translation keys and values for this example */ import '@shopify/ui-extensions/preact'; import {render} from 'preact'; export default function extension() { render(, document.body); } function Extension() { const points = 10000; const formattedPoints = shopify.i18n.formatNumber(points); // Translate the loyalty points message, using pluralization to differentiate messages const loyaltyPointsMsg = shopify.i18n.translate( 'loyaltyPoints', { count: points, formattedPoints, }, ); return {loyaltyPointsMsg}; } ``` ##### locales/en.default.json ```json { "loyaltyPoints": { "one": "You have {{formattedPoints}} loyalty point", "other": "You have {{formattedPoints}} loyalty points" } } ``` ## Related [Reference - Targets](https://shopify.dev/docs/api/checkout-ui-extensions/targets) [Reference - Components](https://shopify.dev/docs/api/checkout-ui-extensions/components) [Reference - Configuration](https://shopify.dev/docs/api/checkout-ui-extensions/configuration) [Learn - Tutorials](https://shopify.dev/apps/checkout)