Storybook i18next Addon
Add i18next support to Storybook
npm install storybook-i18next
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Storybook i18next addon (React)

Add i18next support to Storybook for React projects.

Installation

This addon should be added as a dev dependency.

npm i -D storybook-i18next
yarn add -D storybook-i18next

You will need to install i18next and react-i18next as dependencies to your project if they are not already installed.

npm i -S i18next react-i18next
yarn add i18next react-i18next

Usage

After installing, follow these 3 steps to enable this addon in Storybook.

main.js

Insert this addon into your addons array:

{
  addons: [
    // other addons...
    'storybook-i18next',
  ]
}

i18next.js

Create a file in your .storybook folder called i18next.js (or whatever you like).

In this file, copy and paste the below code and make whatever modifications you need.

import {initReactI18next} from 'react-i18next';
import i18n from 'i18next';
import LanguageDetector from 'i18next-browser-languagedetector';

const ns = ['common'];
const supportedLngs = ['en', 'fr', 'ja'];

i18n.use(LanguageDetector)
  .use(initReactI18next)
  .init({
    //debug: true,
    lng: 'en',
    fallbackLng: 'en',
    interpolation: {
      escapeValue: false,
    },
    defaultNS: 'common',
    ns,
    supportedLngs,
  });

supportedLngs.forEach((lang) => {
  ns.forEach((n) => {
    i18n.addResources(
      lang,
      n,
      require(`../public/locales/${lang}/${n}.json`)
    );
  });
});

export {i18n};

Refer to the i18next Configuration Options documentation for detailed information about the configuration options.


preview.js

In your preview.js, you need to add the locales and locale parameters, as well as the i18n that you exported from the above file.

locales is an object where the keys are the "ids" of the locales/languages and the values are the names you want to display in the dropdown.

locale is what you want the default locale to be.

import {i18n} from './i18next.js';

export const parameters = {
  i18n,
  locale: 'en',
  locales: {
    en: 'English',
    fr: 'Français',
    ja: '日本語',
  },
};

You can also use full locale strings as keys. It depends on your i18next configuration.

import {i18n} from './i18next.js';

export const parameters = {
  i18n,
  locale: 'en_US',
  locales: {
    en_US: 'English (US)',
    en_GB: 'English (GB)',
    fr_FR: 'French',
    ja_JP: 'Japanese',
  },
};

Once you have finished these steps and launch storybook, you should see a globe icon in the toolbar.

Clicking this globe icon will show a dropdown with the locales you defined in parameters.

Switching locales will use the strings defined in your locale json files.