# Input Mask

> A credit-card style text input that auto-formats digits into 4-character groups as the user types, useful for payment or card-number fields.

- Author: [Isaiah](https://21st.dev/@isaiahbjork)
- Library: @bjork-ui
- License: no-license
- Tags: Input, Credit Card, Form
- npm dependencies: clsx, lucide-react, framer-motion, tailwind-merge, class-variance-authority
- Live preview: https://21st.dev/@isaiahbjork/components/primitive-input-mask

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/isaiahbjork/primitive-input-mask?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/input.md