# Internationalization

If you're building a shop for an international brand, you likely want it translated to different languages and using different currencies. In this document, you will learn how we're approaching internationalization in Vue Storefront and how to configure your application to use it.

i18n is not multi-tenancy!

This document only explains how to make a single shop instance available for multiple countries. If you need to build a system for multiple tenants, we suggest creating an instance of Vue Storefront for each tenant and sharing common resources through an NPM package.

# How it works by default?

By default, we are using the nuxt-i18n (opens new window) module for handling both translations and currencies. It's preinstalled in the default theme and is configured for English and German translations out of the box.

The nuxt-i18n module adds the $t('key') and $n(number) helpers to translate strings and format the currencies.

You can find the translation keys in the lang directory of your project and configuration for currencies in nuxt.config.js.

TIP

Even though the module is included in the default theme, it's not required. You can disable it and handle internationalization yourself.

To provide a unified way to configure internationalization across the application for different modules and integrations, we have introduced the i18n field in each module's configuration. It has the same format as the nuxt-i18n options. You can add any configuration there, and it will be propagated to all other Vue Storefront modules.

All Vue Storefront integrations have the useNuxtI18nConfig property set to true. It means that they will use the same configuration as you provided for nuxt-i18n in the i18n field of your nuxt.config.js.

// nuxt.config.js

export default {
  buildModules: [
    [
      '@vue-storefront/{INTEGRATION}/nuxt',
      {
        // other comfiguration options
        i18n: {
          useNuxtI18nConfig: true,
        },
      },
    ],
  ],
  i18n: {
    locales: [
      {
        code: 'en',
        label: 'English',
        file: 'en.js',
        iso: 'en',
      },
      {
        code: 'de',
        label: 'German',
        file: 'de.js',
        iso: 'de',
      },
    ],
    defaultLocale: 'en',
  },
};

# Configuring modules separately

You can provide your own i18n configuration for a specific module by setting useNuxtI18nConfig to false.

// nuxt.config.js

export default {
  [
    '@vue-storefront/{INTEGRATION}/nuxt',
    {
      i18n: {
        useNuxtI18nConfig: false,
        locales: [
          {
            code: 'en',
            label: 'English',
            file: 'en.js',
            iso: 'en',
          },
          {
            code: 'de',
            label: 'German',
            file: 'de.js',
            iso: 'de',
          },
        ],
        defaultLocale: 'en'
      }
    }
  ];
}

# CDN and cookies

The server's response cannot contain the Set-Cookie header to make CDNs cache the website correctly.

To achieve that, we've made our own mechanism for handling cookies responsible for storing locale, currency, and country. This mechanism also handles language detection and redirecting to the proper locale. For this reason, @nuxtjs/i18n language detection is disabled by default.

// nuxt.config.js
export default {
  i18n: {
    detectBrowserLanguage: false,
  },
};

If you don't want to redirect users, you can disable this mechanism, as described in the section below.

# Disabling the auto-redirect mechanism

The @vue-storefront/nuxt module includes an auto-redirect mechanism that performs a server-side redirect to different URLs based on the target locale.

You can disable this by setting autoRedirectByLocale to false in the i18n configuration object.

// nuxt.config.js

export default {
  i18n: {
    autoRedirectByLocale: false,
  },
};

# Currency detection

In addition to language detection, we also set currency based on locale. You can configure it in nuxt.config.js with the vueI18n.numberFormats property.

For more configuration options of numberFormats entries, check the Intl.NumberFormat() (opens new window) documentation.

// nuxt.config.js

export default {
  i18n: {
    vueI18n: {
      numberFormats: {
        en: {
          currency: {
            style: 'currency',
            currency: 'USD',
            currencyDisplay: 'symbol',
          },
        },
        // ...other locales
      },
    },
  },
};

Please note that only one currency can be set for each locale.

If this is a limitation for you, or if you don't want to have currencies tied to locales, you can disable this mechanism and provide your own.

To disable it, set autoChangeCookie.currency to false as described in the section below.

You can configure how @vue-storefront/nuxt handles cookie changes when the locale changes with the autoChangeCookie object.

The autoChangeCookie object holds three properties directly linked to currency, locale, and country. These properties control how the module handles changing cookies.

If set to false, the module won't change any cookies based on configurations or browser locale, and the integration will have to handle it.

// nuxt.config.js

export default {
  buildModules: [
    [
      '@vue-storefront/{INTEGRATION}/nuxt',
      {
        i18n: {
          useNuxtI18nConfig: true,
        },
      },
    ],
  ],
  i18n: {
    locales: [
      {
        code: 'en',
        label: 'English',
        file: 'en.js',
        iso: 'en',
      },
      {
        code: 'de',
        label: 'German',
        file: 'de.js',
        iso: 'de',
      },
    ],
    defaultLocale: 'en',
    autoChangeCookie: {
      currency: false,
      locale: false,
      country: false,
    },
  },
};

You can overwrite the default locale, currency, and country cookie attributes set by @vue-storefront/nuxt or add custom attributes.

To do so, add the cookieOptions object to the i18n configuration object in the nuxt.config.js file and specify the attributes you'd like the cookies to have.

// nuxt.config.js

export default {
  i18n: {
    cookieOptions: {
      // default attributes used by the `@vue-storefront/nuxt` module
      path: '/',
      sameSite: 'lax',
      expires: new Date(new Date().setFullYear(new Date().getFullYear() + 1)),
    },
  },
};