Japanese (ja)

Complete reference for the ja locale — live Intl API output, CLDR plural rules, and framework config snippets.

Référence de locale

Japanese

Métadonnées de la locale

Code BCP 47ja

Nom natif日本語

Nom anglaisJapanese

Langueja

RégionAucune (locale de base)

ÉcritureJpan

Sens du texteDe gauche à droite (LTR)

Catégories de pluriel CLDRother

Locuteurs estimés~125,000,000

Intl API Live Output

DateTimeFormat

Short2026/09/14

Medium2026/09/14

Long2026年9月14日

Full2026年9月14日月曜日

NumberFormat

Decimal1,234,567.89

Currency (USD)$9.99

Percent75%

Compact120万

RelativeTimeFormat

3 日前

Output for: -3 days ago

ListFormat

apples、oranges、bananas

Conjunction list: apples, oranges, bananas

CLDR Plural Rules

Categories supported by ja: other

otherExample number: 100

→ other

Framework Config Snippets

next-intl

// next-intl configuration
// next.config.ts
import createNextIntlPlugin from 'next-intl/plugin';
const withNextIntl = createNextIntlPlugin();
export default withNextIntl({});

// i18n/routing.ts
import { defineRouting } from 'next-intl/routing';
export const routing = defineRouting({
  locales: ['ja', 'en'],
  defaultLocale: 'en',
});

react-intl

// react-intl configuration
import { IntlProvider } from 'react-intl';
import messages from './messages/ja.json';

function App() {
  return (
    <IntlProvider locale="ja" messages={messages}>
      {/* your app */}
    </IntlProvider>
  );
}

i18next

// i18next configuration
import i18n from 'i18next';
import { initReactI18next } from 'react-i18next';

i18n
  .use(initReactI18next)
  .init({
    lng: 'ja',
    fallbackLng: 'en',
    resources: {
      'ja': {
        translation: require('./locales/ja/translation.json'),
      },
    },
  });

export default i18n;