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+---
+title: detectLanguage
+tags: browser,intermediate
+---
+
+Detects the preferred language of the current user.
+
+- Use `NavigationLanguage.language` or the first `NavigationLanguage.languages` if available, otherwise return `defaultLang`.
+- Omit the second argument, `defaultLang`, to use `'en-US'` as the default language code.
+
+```js
+const detectLanguage = (defaultLang = 'en-US') => 
+  navigator.language ||
+  (Array.isArray(navigator.languages) && navigator.languages[0]) ||
+  defaultLang;
+```
+
+```js
+detectLanguage(); // 'nl-NL'
+```