Japanese (Japan) (ja-JP)

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

Riferimento della locale

Japanese (Japan)

Metadati della locale

Codice BCP 47ja-JP

Nome nativo日本語（日本）

Nome ingleseJapanese (Japan)

Linguaja

RegioneJP

Sistema di scritturaJpan

Direzione del testoDa sinistra a destra (LTR)

Categorie di plurale CLDRother

Parlanti stimati~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-JP: 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-JP', 'en'],
  defaultLocale: 'en',
});

react-intl

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

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

i18next

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

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

export default i18n;