index.md

---

title: i18n.getUILanguage()
slug: Mozilla/Add-ons/WebExtensions/API/i18n/getUILanguage
page-type: webextension-api-function
tags:
  - API
  - Add-ons
  - Extensions
  - Method
  - Non-standard
  - Reference
  - WebExtensions
  - getUILanguage
  - i18n
browser-compat: webextensions.api.i18n.getUILanguage

---

{{AddonSidebar()}}

Gets the UI language of the browser. This is different from {{WebExtAPIRef('i18n.getAcceptLanguages')}} which returns the preferred user languages.

See the Internationalization page for a guide on using this function.

Syntax

browser.i18n.getUILanguage()

Parameters

None.

Return value

string. The browser UI language code as an {{WebExtAPIRef("i18n.LanguageCode")}}.

Browser compatibility

{{Compat}}

Examples

let uiLanguage = browser.i18n.getUILanguage();
console.log(uiLanguage);

//e.g. "fr"

{{WebExtExamples}}

Note: This API is based on Chromium's chrome.i18n API. This documentation is derived from i18n.json in the Chromium code.