A flexible Table of Contents (ToC) generator component for Astro. Perfect for blogs, documentation, or any content-rich page which benefits from in-page navigation.

Note: In this documentation:

• TOC refers to the Astro component (<TOC />)
• ToC refers to the data or concept of a Table of Contents

Table of Contents

• Features
• Demo
• Installation
• Usage
  • Basic example
  • Custom component example
• API
  • Component Props
  • TypeScript Types
• License

Features

• 🧩 Flexible: Use custom component for enhanced render output
• 📐 Fine-tune: Use depth and maxDepth props to control nested level range
• 🗂️ Semantic output: Uses native ul, ol, or menu elements
• ⚙️ TypeScript friendly

Demo

Try it out on:

Installation

Choose your favorite package manager and install astro-toc.

npm install astro-toc
# or
pnpm add astro-toc
# or
yarn add astro-toc
# or
bun add astro-toc

Usage

Provide your ToC data as an array of TocItem objects (each requiring depth and title, with optional url). Pass this data to the TOC component for rendering.

Basic example

---
/* pages/index.astro */
import type { TocItem } from "astro-toc";

const toc = [
  { depth: 1, title: "Main Stage - Friday", url: "#main-stage-friday" },
  { depth: 2, title: "The Rock Lobsters (8pm)", url: "#the-rock-lobsters" },
  { depth: 2, title: "Cosmic Latte (10pm)", url: "#cosmic-latte" },
  { depth: 1, title: "Dance Tent - Friday", url: "#dance-tent" },
  { depth: 2, title: "DJ SpinCycle (9pm)", url: "#dj-spincycle" },
  { depth: 2, title: "GlitterBomb (11pm)", url: "#glitterbomb" },
  { depth: 1, title: "Main Stage - Saturday", url: "#main-stage-saturday" },
  { depth: 2, title: "The Acousticats (7pm)", url: "#the-acousticats" },
  { depth: 2, title: "Planet Groove (9pm)", url: "#planet-groove" },
  { depth: 1, title: "Food & Merch", url: "#food-merch"},
  { depth: 2, title: "Vegan Delights", url: "#food-vegan"},
  { depth: 2, title: "Band T-Shirts", url: "#merch-shirts"},
] satisfies TocItem[];
---

<TOC toc={toc} />

Custom component example

Implementing a custom component allows you to create a richer, more styled ToC output. Extend the TocItem with extra props and use them in your component.

---
/* pages/index.astro */
import type { TocItem } from "astro-toc";
import Card, { type CardProps } from "@/components/Card.astro";

const toc = [
  { depth: 1, title: "Main Stage - Friday", url: "#main-stage-friday", icon: "location" },
  { depth: 2, title: "The Rock Lobsters (8pm)", url: "#the-rock-lobsters", icon: "microphone" },
  { depth: 2, title: "Cosmic Latte (10pm)", url: "#cosmic-latte", icon: "microphone" },
  { depth: 1, title: "Dance Tent - Friday", url: "#dance-tent", icon: "location" },
  { depth: 2, title: "DJ SpinCycle (9pm)", url: "#dj-spincycle", icon: "microphone" },
  { depth: 2, title: "GlitterBomb (11pm)", url: "#glitterbomb", icon: "microphone" },
  { depth: 1, title: "Main Stage - Saturday", url: "#main-stage-saturday", icon: "location" },
  { depth: 2, title: "The Acousticats (7pm)", url: "#the-acousticats", icon: "microphone" },
  { depth: 2, title: "Planet Groove (9pm)", url: "#planet-groove", icon: "microphone" },
  { depth: 1, title: "Food & Merch", url: "#food-merch", icon: "store"},
  { depth: 2, title: "Vegan Delights", url: "#food-vegan", icon: "food"},
  { depth: 2, title: "Band T-Shirts", url: "#merch-shirts", icon: "apparel"},
] satisfies CardProps[];
---

<TOC toc={toc} use={Card} />

---
// components/Card.astro
import type { TocItem } from "astro-toc";

export interface CardProps extends TocItem {
  icon?: string; // Extra prop
}

type Props = CardProps;

const { title, url, icon, /* depth */ } = Astro.props;
---

<p>
  {icon && <i class={`icon ${icon}`} aria-hidden="true"></i>}
  {url ? <a href={url}>{title}</a> : <span>{title}</span>}
</p>

<style>
  p {
    display: flex;
    column-gap: 1rem;
  }
</style>

API

Component Props (TocProps<T extends TocItem = TocItem>)

The TOC component accepts props defined by the generic type TocProps<T extends TocItem = TocItem>.

• Generic T: This represents the shape of a ToC item within your toc array. It must include the required depth and title fields.

| Property | Type | Default | Description | | :---------------- | :----------------------------- | :---------- | :-------------------------------------------------------------------------------------------------------------------------------------- | | toc | Array<T> | Required | Array of ToC item objects (T extends TocItem). | | as | bullet | number | menu | bullet | Optional List style: ul (bullet), ol (number), or semantic menu | | depth | number | 1 | Optional Minimum heading depth to render (inclusive); controls the starting level. | | maxDepth | number | undefined | Optional Maximum heading depth to render (inclusive) | | use | (props: T) => any | undefined | Optional Custom Astro component to render each ToC item. Receives item (T) as props. | | HTML Attrs | astroHTML.JSX.HTMLAttributes | n/a | Standard HTML attributes applied to each list container (ul, ol, or menu), including nested levels. Not applied to li elements. |

TypeScript Types

/**
 * Represents a single item in a Table of Contents (ToC).
 */
export interface TocItem {
  /**
   * Source heading level (1=<h1>, 2=<h2>, ...).
   */
  depth: number;
  /**
   * The visible text of the heading.
   */
  title: string;
  /**
   * Optional URL fragment (`#id`) for linking to the heading.
   */
  url?: string;
}

/**
 * Props for a component rendering a Table of Contents (ToC).
 *
 * @typeParam T - The shape of items in the ToC array, extending TocItem.
 */
export type TocProps<T extends TocItem = TocItem> = {
  /**
   * List style type: unordered list (`bullet`), ordered list (`number`), or semantic menu.
   *
   * Default is `bullet`.
   */
  as?: "bullet" | "number" | "menu";
  /**
   * Minimum heading depth to include (inclusive).
   *
   * Default is `1`.
   */
  depth?: number;
  /**
   * Maximum heading depth to include (inclusive).
   */
  maxDepth?: number;
  /**
   *  Array of ToC items to render.
   */
  toc: T[];
  /**
   * Optional custom component to render each `ToC` item.
   */
  use?: (item: T) => any;
};

License

Licensed under the ISC License.