# Table of Contents

> On-this-page navigation that tracks the active heading as you scroll and highlights it with a moving border marker.

- Author: [Hirael](https://21st.dev/@hirael)
- Library: Hirael
- License: MIT
- Tags: Table of Content, Navigation, Scrollspy, Table of Contents, On This Page
- Live preview: https://21st.dev/@hirael/components/toc

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/hirael/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-content.md