# Chat

> A composable chat UI with a scrollable message viewport, self/peer/system message bubbles with avatars and timestamps, and an auto-resizing input area for sending messages.

- Author: [joyco](https://21st.dev/@joyco)
- Library: @joyco
- License: no-license
- Tags: Chat, Messaging, Conversation, Chatbot
- npm dependencies: debounce, lucide-react, react-use-measure
- Live preview: https://21st.dev/@joyco/components/chat

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/joyco/chat?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/chat.md