## Usage

VitePress supports YAML frontmatter in all Markdown files, parsing them with [gray-matter](https://github.com/jonschlinkert/gray-matter). The frontmatter must be at the top of the Markdown file (before any elements including `<script>` tags), and must take the form of valid YAML set between triple-dashed lines. Example:

```md
---
title: Docs with VitePress
editLink: true
---
```

Many site or default theme config options have corresponding options in frontmatter. You can use frontmatter to override specific behavior for the current page only. For details, see [Frontmatter Config Reference](/guides/reference-frontmatter-config).

You can also define custom frontmatter data of your own, to be used in dynamic Vue expressions on the page.

## Accessing Frontmatter Data

Frontmatter data can be accessed via the special `$frontmatter` global variable:

Here's an example of how you could use it in your Markdown file:

```md
---
title: Docs with VitePress
editLink: true
---

# {{ $frontmatter.title }}

Guide content
```

Property accesses like `{{ $frontmatter.title }}` are resolved while the Markdown is rendered, so the value also ends up in the local search index, in [content loader](/guides/customization-data-loading#createcontentloader) output, in heading anchors - the heading above gets `id="docs-with-vitepress"` - and in link targets written without spaces around the expression, like `[text]({{$frontmatter.link}})`. Other expressions are evaluated by Vue at runtime as usual, and wrapping an expression in [`v-pre`](/guides/writing-using-vue#escaping) shows it literally.

You can also access current page's frontmatter data in `<script setup>` with the [`useData()`](/guides/reference-runtime-api#usedata) helper.

## Alternative Frontmatter Formats

VitePress also supports JSON frontmatter syntax, starting and ending in curly braces:

```json
---
{
  "title": "Blogging Like a Hacker",
  "editLink": true
}
---
```

## Related pages

- [Customization](./customization-index.md)
- [Experimental](./experimental-index.md)
- [Guide](./guide-index.md)
- [Introduction](./introduction-index.md)
- [Overview](./overview-index.md)
- [Reference](./reference-index.md)
- [VitePress](../index.md)
- [Writing](./writing-index.md)
- [Frontmatter Config](./reference-frontmatter-config.md)
- [Markdown Extensions](./writing-markdown.md)

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