Function getLanguageName

getLanguageName(locale?: string): undefined | string

Resolves a locale code to a human-readable language name using the countries-list language data. The native name is preferred (e.g. "Deutsch"), falling back to the English name and finally the raw code.

Parameters

Optionallocale: string
A locale or language code, e.g. "de-DE" or "de"; undefined yields undefined

Returns undefined | string

The language's display name, or undefined when no locale is given

Example

getLanguageName("en-US") // Returns "English"
getLanguageName("de-DE") // Returns "Deutsch"
getLanguageName(undefined) // Returns undefined

Source

export function getLanguageName(locale?: string): string | undefined {
  if (!locale) {
    return undefined;
  }
  const base = locale.split('-')[0].toLowerCase();
  const entry = (iso639Languages as Record<string, { name: string; native: string }>)[base];
  return entry?.native ?? entry?.name ?? locale;
}