# Code Block

> A syntax-highlighted code block with an optional header, filename, language icon, tabs, line numbers, diff markers, focus mode, and a copy-to-clipboard button.

- Author: [cubby-ui](https://21st.dev/@cubby-ui)
- Library: @cubby-ui
- License: MIT
- Tags: Documentation, Code Block, Copy Button, Syntax Highlighting, Shiki
- npm dependencies: shiki, @base-ui/react, @hugeicons/react, @hugeicons/core-free-icons, @icons-pack/react-simple-icons
- Live preview: https://21st.dev/@cubby-ui/components/code-block

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/cubby-ui/code-block?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/documentation.md