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React Email supports react-i18next for internationalization. This guide shows how to convert an English React Email template to support multiple locales.

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Prerequisites

To get the most out of this guide, you’ll need to: 
npm i -S react-i18next i18next i18next-resources-to-backend
This guide will use the following email template as a base.
emails/welcome.jsx
export default function WelcomeEmail({ name }) {
  return (
    <Html>
      <Head />
      <Preview>Welcome to Acme</Preview>
      <Tailwind>
        <Body className="bg-gray-100 font-sans">
          <Container className="mx-auto py-10 px-5">
            <Section className="bg-white rounded-lg p-8">
              <Heading className="text-2xl font-bold text-gray-900 m-0 mb-6">
                Welcome to Acme
              </Heading>
              <Text className="text-base leading-6 text-gray-600 m-0 mb-4">
                Hi {name}
              </Text>
              <Text className="text-base leading-6 text-gray-600 m-0 mb-4">
                Thanks for signing up! We're excited to have you on board.
              </Text>
              <Button
                href="https://example.com/dashboard"
                className="bg-indigo-600 rounded-md text-white text-base font-semibold no-underline text-center block py-3 px-6 my-6"
              >
                Get Started
              </Button>
              <Hr className="border-gray-200 my-6" />
              <Text className="text-sm text-gray-400 m-0">
                If you have any questions, reply to this email. We're here to help!
              </Text>
            </Section>
          </Container>
        </Body>
      </Tailwind>
    </Html>
  );
}

WelcomeEmail.PreviewProps = {
  name: 'John Lennon',
};

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Internationalization with react-i18next

react-i18next is a library for internationalization and localization that provides a way to format messages in different languages.

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1. Create messages for each locale

For each locale, create a new JSON file containing the content of the email in that locale. 
{
  "header": "Welcome to Acme",
  "hi": "Hi",
  "thanks": "Thanks for signing up! We're excited to have you on board.",
  "get-started": "Get Started",
  "questions": "If you have any questions, reply to this email. We're here to help!"
}

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2. Update the email props

Add the locale prop to the email template, interface, and test data.
emails/welcome.jsx
export default function WelcomeEmail({ name }) {
export default function WelcomeEmail({ name, locale }) {
  return (
   ...
  );
}

WelcomeEmail.PreviewProps = {
  name: 'John Lennon',
  locale: 'en',
};

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3. Setting up helpers

If you don’t already, go ahead and create a getT helper meant for getting translations on the server:
get-t.js
import { i18next } from './i18n';

export async function getT(namespace, locale) {
  if (locale && i18next.resolvedLanguage !== locale) {
    await i18next.changeLanguage(locale)
  }
  if (namespace && !i18next.hasLoadedNamespace(namespace)) {
    await i18next.loadNamespaces(namespace)
  }
  return {
    t: i18next.getFixedT(
      locale ?? i18next.resolvedLanguage,
      Array.isArray(namespace) ? namespace[0] : namespace,
    ),
    i18n: i18next
  }
}
Where ./i18n is where you would have setup your i18next, for example:
i18n.js
import i18next, { loadNamespaces } from 'i18next';
import resourcesToBackend from 'i18next-resources-to-backend';
import { initReactI18next } from 'react-i18next';

i18next
  .use(initReactI18next)
  .use(resourcesToBackend((language, namespace) => import(`messages/${language}/${namespace}.json`)))
  .init({
    supportedLngs: ['en', 'es', 'pt'],
    fallbackLng: 'en',
    lng: undefined,
    detection: {
      order: ['path', 'htmlTag', 'cookie', 'navigator']
    },
    preload: typeof window === 'undefined' ? ['en', 'es', 'pt'] : [],
  });

export { i18next };

​
4. Update the email template

In the email template, remove the hardcoded content and use getT’s t to format the email message strings.
emails/welcome.jsx
import { getT } from '../get-t';

export default async function WelcomeEmail({ name, locale }) {
  const { t } = await getT('welcome-email', locale);

  return (
    <Html>
      <Head />
      <Preview>Welcome to Acme</Preview>
      <Preview>{t('header')}</Preview>
      <Tailwind>
        <Body className="bg-gray-100 font-sans">
          <Container className="mx-auto py-10 px-5">
            <Section className="bg-white rounded-lg p-8">
              <Heading className="text-2xl font-bold text-gray-900 m-0 mb-6">
                Welcome to Acme
                {t('header')}
              </Heading>
              <Text className="text-base leading-6 text-gray-600 m-0 mb-4">
                Hi {name}
                {t('hi')} {name}
              </Text>
              <Text className="text-base leading-6 text-gray-600 m-0 mb-4">
                Thanks for signing up! We're excited to have you on board.
                {t('thanks')}
              </Text>
              <Button
                href="https://example.com/dashboard"
                className="bg-indigo-600 rounded-md text-white text-base font-semibold no-underline text-center block py-3 px-6 my-6"
              >
                Get Started
                {t('get-started')}
              </Button>
              <Hr className="border-gray-200 my-6" />
              <Text className="text-sm text-gray-400 m-0">
                If you have any questions, reply to this email. We're here to help!
                {t('questions')}
              </Text>
            </Section>
          </Container>
        </Body>
      </Tailwind>
    </Html>
  );
}

WelcomeEmail.PreviewProps = {
  name: 'John Lennon',
  locale: 'en',
};

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5. Update any email calls

When calling the email template, pass the locale prop to the email component.

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Try it yourself

React Email with react-i18next example

See the full source code.

Resend with react-i18next example

See the full source code.