ja
Japanese
日本語
Japonic
Language Code
ISO 639-1 Code
ja
Common Usage
HTML lang attribute
<html lang="ja">
HTTP Accept-Language Header
Accept-Language: ja
JavaScript/TypeScript
const language = "ja"; const languageName = "Japanese";
ISO 639 Standard
ISO 639-1 is the international standard for language codes. These two-letter codes are used in HTML lang attributes, HTTP headers, and i18n/l10n systems. The code "ja" represents Japanese (日本語) and is part of the Japonic language family.