# hast-util-to-parse5

> hast utility to transform to a `parse5` AST

Latest version **8.0.1** (published 2025-12-04) · MIT license · 0 weekly downloads

## Install

```sh
npm install hast-util-to-parse5
pnpm add hast-util-to-parse5
yarn add hast-util-to-parse5
bun add hast-util-to-parse5
```

## Health

**Score 60/100 (C)** — status: stable.

Positive: has types; esm support; no vulnerabilities; high quality score.

Warnings: low downloads.

## Facts

| | |
|---|---|
| Version | 8.0.1 |
| Published | 2025-12-04 |
| First published | 2016-07-26 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | ESM |
| Dependencies | 7 |
| Unpacked size | 19.6 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 2 |
| Author | Titus Wormer |
| Maintainers | wooorm, kmck |
| Keywords | unist, hast, hast-util, util, utility, html, parse5, ast, tree |

## Links

- npm: https://www.npmjs.com/package/hast-util-to-parse5
- Repository: https://github.com/syntax-tree/hast-util-to-parse5
- Homepage: https://github.com/syntax-tree/hast-util-to-parse5#readme
- Issues: https://github.com/syntax-tree/hast-util-to-parse5/issues
- Funding: https://opencollective.com/unified
- npm.io page: https://npm.io/package/hast-util-to-parse5

## Dependencies (7)

- [devlop](https://npm.io/package/devlop.md) ^1.0.0
- [zwitch](https://npm.io/package/zwitch.md) ^2.0.0
- [@types/hast](https://npm.io/package/@types/hast.md) ^3.0.0
- [web-namespaces](https://npm.io/package/web-namespaces.md) ^2.0.0
- [property-information](https://npm.io/package/property-information.md) ^7.0.0
- [comma-separated-tokens](https://npm.io/package/comma-separated-tokens.md) ^2.0.0
- [space-separated-tokens](https://npm.io/package/space-separated-tokens.md) ^2.0.0

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## Recent versions

- 8.0.1 (latest) — 2025-12-04
- 8.0.0 — 2023-07-31
- 7.1.0 — 2023-01-15
- 7.0.0 — 2021-05-02
- 6.0.0 — 2020-06-16
- 5.1.2 — 2020-02-28
- 5.1.1 — 2019-05-26
- 5.1.0 — 2019-04-26
- 5.0.0 — 2018-11-07
- 4.0.1 — 2018-07-17
- 4.0.0 — 2018-07-17
- 3.0.0 — 2018-06-11
- 2.2.0 — 2017-07-24
- 2.1.0 — 2017-05-13
- 2.0.0 — 2016-12-05
- … 1 more at https://npm.io/package/hast-util-to-parse5/versions

## README

# hast-util-to-parse5

[![Build][build-badge]][build]
[![Coverage][coverage-badge]][coverage]
[![Downloads][downloads-badge]][downloads]
[![Size][size-badge]][size]
[![Sponsors][sponsors-badge]][collective]
[![Backers][backers-badge]][collective]
[![Chat][chat-badge]][chat]

[hast][] utility to transform to a [`parse5`][parse5] [AST][parse5-node].

## Contents

* [What is this?](#what-is-this)
* [When should I use this?](#when-should-i-use-this)
* [Install](#install)
* [Use](#use)
* [API](#api)
  * [`toParse5(tree[, options])`](#toparse5tree-options)
  * [`Options`](#options)
  * [`Space`](#space)
* [Types](#types)
* [Compatibility](#compatibility)
* [Security](#security)
* [Related](#related)
* [Contribute](#contribute)
* [License](#license)

## What is this?

This package is a utility that can turn a hast syntax tree into a `parse5` AST.
Why not use a Parse5 adapter, you might ask?
Well, because it’s more code weight to use adapters, and more fragile.

## When should I use this?

This package is useful when working with `parse5`, and for some reason want to
generate its AST again.
The inverse utility, [`hast-util-from-parse5`][hast-util-from-parse5], is more
likely what you want.

## Install

This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:

```sh
npm install hast-util-to-parse5
```

In Deno with [`esm.sh`][esmsh]:

```js
import {toParse5} from 'https://esm.sh/hast-util-to-parse5@8'
```

In browsers with [`esm.sh`][esmsh]:

```html
<script type="module">
  import {toParse5} from 'https://esm.sh/hast-util-to-parse5@8?bundle'
</script>
```

## Use

```js
import {toParse5} from 'hast-util-to-parse5'

const tree = toParse5({
  type: 'element',
  tagName: 'h1',
  properties: {},
  children: [{type: 'text', value: 'World!'}]
})

console.log(tree)
```

Yields:

```js
{ nodeName: 'h1',
  tagName: 'h1',
  attrs: [],
  namespaceURI: 'http://www.w3.org/1999/xhtml',
  childNodes: [ { nodeName: '#text', value: 'World!', parentNode: [Circular] } ] }
```

## API

This package exports the identifier [`toParse5`][api-to-parse5].
There is no default export.

### `toParse5(tree[, options])`

Transform a hast tree to a `parse5` AST.

###### Parameters

* `tree` ([`HastNode`][hast-node])
  — tree to transform
* `options` ([`Options`][api-options], optional)
  — configuration

###### Returns

`parse5` node ([`Parse5Node`][parse5-node]).

### `Options`

Configuration (TypeScript type).

###### Fields

* `space` ([`Space`][api-space], optional)
  — which space the document is in

### `Space`

Namespace (TypeScript type).

###### Type

```ts
type Space = 'html' | 'svg'
```

## Types

This package is fully typed with [TypeScript][].
It exports the additional types [`Options`][api-options] and
[`Space`][api-space].

## Compatibility

Projects maintained by the unified collective are compatible with maintained
versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of
Node.
This means we try to keep the current release line, `hast-util-to-parse5@^8`,
compatible with Node.js 16.

## Security

Use of `hast-util-to-parse5` can open you up to a
[cross-site scripting (XSS)][xss] attack if the hast tree is unsafe.

## Related

* [`hast-util-from-parse5`](https://github.com/syntax-tree/hast-util-from-parse5)
  — transform from Parse5’s AST to hast
* [`hast-util-to-nlcst`](https://github.com/syntax-tree/hast-util-to-nlcst)
  — transform hast to nlcst
* [`hast-util-to-mdast`](https://github.com/syntax-tree/hast-util-to-mdast)
  — transform hast to mdast
* [`hast-util-to-xast`](https://github.com/syntax-tree/hast-util-to-xast)
  — transform hast to xast
* [`mdast-util-to-hast`](https://github.com/syntax-tree/mdast-util-to-hast)
  — transform mdast to hast
* [`mdast-util-to-nlcst`](https://github.com/syntax-tree/mdast-util-to-nlcst)
  — transform mdast to nlcst

## Contribute

See [`contributing.md`][contributing] in [`syntax-tree/.github`][health] for
ways to get started.
See [`support.md`][support] for ways to get help.

This project has a [code of conduct][coc].
By interacting with this repository, organization, or community you agree to
abide by its terms.

## License

[MIT][license] © [Titus Wormer][author]

<!-- Definitions -->

[build-badge]: https://github.com/syntax-tree/hast-util-to-parse5/workflows/main/badge.svg

[build]: https://github.com/syntax-tree/hast-util-to-parse5/actions

[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/hast-util-to-parse5.svg

[coverage]: https://codecov.io/github/syntax-tree/hast-util-to-parse5

[downloads-badge]: https://img.shields.io/npm/dm/hast-util-to-parse5.svg

[downloads]: https://www.npmjs.com/package/hast-util-to-parse5

[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=hast-util-to-parse5

[size]: https://bundlejs.com/?q=hast-util-to-parse5

[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg

[backers-badge]: https://opencollective.com/unified/backers/badge.svg

[collective]: https://opencollective.com/unified

[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg

[chat]: https://github.com/syntax-tree/unist/discussions

[npm]: https://docs.npmjs.com/cli/install

[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

[esmsh]: https://esm.sh

[typescript]: https://www.typescriptlang.org

[license]: license

[author]: https://wooorm.com

[health]: https://github.com/syntax-tree/.github

[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md

[support]: https://github.com/syntax-tree/.github/blob/main/support.md

[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md

[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting

[hast]: https://github.com/syntax-tree/hast

[hast-node]: https://github.com/syntax-tree/hast#nodes

[parse5]: https://github.com/inikulin/parse5

[parse5-node]: https://github.com/inikulin/parse5/blob/master/packages/parse5/lib/tree-adapters/default.ts

[hast-util-from-parse5]: https://github.com/syntax-tree/hast-util-from-parse5

[api-to-parse5]: #toparse5tree-options

[api-options]: #options

[api-space]: #space

---
_Source: https://npm.io/package/hast-util-to-parse5 · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._