openpencil/packages/docs/programmable/sdk/api/composables/use-i18n.md
2026-03-30 15:17:30 +03:00

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---
title: useI18n
description: Read localized OpenPencil UI messages and switch the active SDK locale.
---
# useI18n
`useI18n()` returns reactive translation groups plus locale controls for OpenPencil-powered editor shells.
Use it when you want SDK-backed labels for menus, commands, panels, pages, and dialogs, or when you need to let users switch locales.
## Usage
```ts
import { useI18n } from '@open-pencil/vue'
const { menu, commands, panels, locale, availableLocales, localeLabels, setLocale } = useI18n()
```
## Returns
- `menu`
- `commands`
- `tools`
- `panels`
- `pages`
- `dialogs`
- `locale`
- `availableLocales`
- `localeLabels`
- `setLocale`
## Basic example
```vue
<script setup lang="ts">
import { useI18n } from '@open-pencil/vue'
const { menu, locale, availableLocales, localeLabels, setLocale } = useI18n()
</script>
<template>
<label class="flex items-center gap-2">
<span>{{ menu.view }}</span>
<select :value="locale" @change="setLocale(($event.target as HTMLSelectElement).value as typeof locale)">
<option v-for="code in availableLocales" :key="code" :value="code">
{{ localeLabels[code] }}
</option>
</select>
</label>
</template>
```
## Notes
- locale changes are reactive across all SDK message groups
- the SDK also exports lower-level locale primitives when you need direct store access
## Related APIs
- [useMenuModel](./use-menu-model)
- [SDK Locale APIs](../advanced/locale-apis)