tachybase_todo/docs/guide/plugin-development/i18n.md

---
order: 4
---

# Internationalization

NocoBase uses i18next for internationalization support, unified front and back end, namespace support, perfect for NocoBase plugin system.

## Server side

Initialize i18n

```ts
const app = new Application({
  i18n: {},
});

// Translate
app.i18n.t('hello');
```

In middleware using

```ts
async (ctx, next) => {
  ctx.body = ctx.t('hello');
  // In middleware i18n is cloneInstance
  ctx.i18n.changeLanguage('zh-CN')
}
```

How to use the

```ts
// Add the plugin's language resources
app.i18n.addResources('zh-CN', 'nocobase-plugin-xxx', {
  hello: 'hello plugin-xxx',
});

// need to specify ns, e.g.
app.i18n.t('hello', { ns: 'nocobase-plugin-xxx' });

// middleware
async (ctx, next) => {
  ctx.body = ctx.t('hello', { ns: 'nocobase-plugin-xxx' });
}
```

## Client

To use in a component, by way of the `useTranslation` hook.

```js
import { useTranslation } from 'react-i18next';

export default () => {
  const { t, i18n } = useTranslation('nocobase-plugin-xxx');

  return (
    <div>
      <button
        onClick={() => {
          i18n.changeLanguage('en');
        }}
      >
        en
      </button>
      <button
        onClick={() => {
          i18n.changeLanguage('cn');
        }}
      >
        cn
      </button>
      <p>{t('hello')}</p>
    </div
  );
};
```

Used in Schema to inject t into scope

```js
import { i18n, createSchemaComponent } from '@nocobase/client';

const SchemaComponent = createSchemaComponent({
  scope: {
    t: i18n.t,
  }
});

const schema = {
  type: 'void',
  title: "{{ t('hello') }}",
  'x-component': 'Hello',
};

export default () => {
  return (
    <SchemaComponent schema={schema}/>
  );
}
```

## Example

[click here for the full example](#)