# Invalid / Required Checkbox

> A terms-and-conditions checkbox with an inline error message that appears when the form is submitted without accepting.

- Author: [felipemenezes098](https://21st.dev/@felipemenezes098)
- Library: @flx
- License: MIT
- Tags: Checkbox, Form, Validation, Error
- npm dependencies: sonner
- Live preview: https://21st.dev/@felipemenezes098/components/checkbox-11

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/felipemenezes098/checkbox-11?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/checkbox.md