> For AI agents: the complete documentation index is available at https://rspress.rs/llms.txt, the full documentation bundle is available at https://rspress.rs/llms-full.txt.

# useLang

`useLang` returns the current locale code so you can render language-specific content or route users accordingly.

- **Type:** `() => string`

The hook reads the active language from the runtime context and stays in sync when users switch locales.

```tsx preview
import { useLang } from '@rspress/core/runtime';

export default function Comp() {
  const lang = useLang();
  return <span>Current language: {lang}</span>;
}
```