Storybook i18n

Tool to set the locale in Storybook for i18n

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A library for best-practice i18n addons in Storybook:

  • Easy-to-use locale configuration
  • Simple drop-down menu
  • URL-linkable state for sharing


  • 2.x is for Storybook >=7.0.0
  • 3.x is for Storybook >=8.0.0

Addon authors

As an addon author, you can use this library by adding it as a dependency and adding the following to your src/manager.ts and src/preview.ts files:


export * from 'storybook-i18n/manager';


import type { Renderer, ProjectAnnotations } from '@storybook/types';
import i18n from 'storybook-i18n/preview';
import { withYourI18nDecorator } from './withYourDecorator';

// @ts-ignore
const i18nDecorators = i18n?.decorators || [];

const preview: ProjectAnnotations<Renderer> = {
    decorators: [...i18nDecorators, withYourI18nDecorator],

export default preview;

Due to an issue with Storybook (pending resolution), you will need that @ts-ignore above the decorators line.

The currently selected locale is available in the locale global, so you can access it in a decorator using the following snippet:

import { MyProvider } from 'your-i18n-library';
import { useGlobals } from '@storybook/manager-api';

const myDecorator = (story, context) => {
  const [{locale}] = useGlobals();
  return <MyProvider locale={locale}>;

End users

End users configure the locales and locale globals in .storybook/preview.ts.

locales is an object where the keys are the "ids" of the locale/language and the values are the plain text name of that locale you want to use. This is what will appear in the dropdown in the toolbar.

const preview: Preview = {
    globals: {
        locale: "en",
        locales: {
            en: "English",
            fr: "Français",
            ja: "日本語",

Users can also use full locale strings.

const preview: Preview = {
    globals: {
        locale: "en_US",
        locales: {
            en_US: "English (US)",
            en_GB: "English (GB)",
            fr_FR: "Français",
            ja_JP: "日本語",

The locales object can also have values as an object with keys of title, icon, and/or right.

This is useful if you want to include an emoji flag or some other string to the left and/or right side.

For example:

const preview: Preview = {
    globals: {
        locale: 'en',
        locales: {
            en: {icon: '🇺🇸', title: 'English', right: 'US'},
            fr: {icon: '🇫🇷', title: 'Français', right: 'FR'},
            ja: {icon: '🇯🇵', title: '日本語', right: 'JP'},

Or something like this:

const preview: Preview = {
    globals: {
        locale: 'en_US',
        locales: {
            en_US: {title: 'English', right: 'US'},
            en_GB: {title: 'English', right: 'GB'},
            fr_FR: {title: 'Français', right: 'FR'},
            ja_JP: {title: '日本語', right: 'JP'},

When the locale has been changed, an event is emitted on the addons-channel.

You can subscribe to this event in your preview.ts, to configure global environment settings yourself, related to your i18n-config.

The event is emitted with the selected locale as a parameter.

Your implementation could look like this:

import { addons } from '@storybook/preview-api'

addons.getChannel().on('LOCALE_CHANGED', (newLocale) => {

Addons should instruct them to use whichever format your i18n implementation expects.