# Table of Contents

> A scroll-spy "on this page" navigation sidebar that highlights the heading currently in view as the user scrolls the article.

- Author: [appica-dev](https://21st.dev/@appica-dev)
- Library: @delego
- License: MIT
- Tags: Table of Contents, Table of Content, Scrollspy, Navigation, Sidebar
- npm dependencies: clsx, @base-ui/react, tailwind-merge
- Live preview: https://21st.dev/@appica-dev/components/toc

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/appica-dev/toc?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/table-of-contents.md