# Code Block

> Syntax highlighted code that streams in as an agent writes it, with a caret, file tabs, highlighted lines, wrap and copy. Here a route, its query and its test arrive one tab at a time.

- Author: [Aadi](https://21st.dev/@aadixc0de)
- Library: [chatcn](https://21st.dev/@aadixc0de/library/chatcn)
- License: mit
- Tags: Tabs, Code, Streaming, Devtool, Syntax Highlighting
- npm dependencies: shiki, @base-ui/react
- Live preview: https://21st.dev/@aadixc0de/components/code-block

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/aadixc0de/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/tabs.md