# rehype [![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] **[unified][]** processor to add support for parsing from HTML and serializing to HTML. ## Contents * [What is this?](#what-is-this) * [When should I use this?](#when-should-i-use-this) * [Install](#install) * [Use](#use) * [API](#api) * [`rehype()`](#rehype-1) * [Examples](#examples) * [Example: passing options to `rehype-parse`, `rehype-stringify`](#example-passing-options-to-rehype-parse-rehype-stringify) * [Syntax](#syntax) * [Syntax tree](#syntax-tree) * [Types](#types) * [Compatibility](#compatibility) * [Security](#security) * [Contribute](#contribute) * [Sponsor](#sponsor) * [License](#license) ## What is this? This package is a [unified][] processor with support for parsing HTML as input and serializing HTML as output by using unified with [`rehype-parse`][rehype-parse] and [`rehype-stringify`][rehype-stringify]. See [the monorepo readme][rehype] for info on what the rehype ecosystem is. ## When should I use this? You can use this package when you want to use unified, have HTML as input, and want HTML as output. This package is a shortcut for `unified().use(rehypeParse).use(rehypeStringify)`. When the input isn’t HTML (meaning you don’t need `rehype-parse`) or the output is not HTML (you don’t need `rehype-stringify`), it’s recommended to use `unified` directly. When you’re in a browser, trust your content, don’t need positional info on nodes or formatting options, and value a smaller bundle size, you can use [`rehype-dom`][rehype-dom] instead. When you want to inspect and format HTML files in a project on the command line, you can use [`rehype-cli`][rehype-cli]. ## Install This package is [ESM only][esm]. In Node.js (version 16+), install with [npm][]: ```sh npm install rehype ``` In Deno with [`esm.sh`][esmsh]: ```js import {rehype} from 'https://esm.sh/rehype@13' ``` In browsers with [`esm.sh`][esmsh]: ```html ``` ## Use Say we have the following module `example.js`: ```js import {rehype} from 'rehype' import rehypeFormat from 'rehype-format' const file = await rehype().use(rehypeFormat).process(` Hi!

Hello!

`) console.error(String(file)) ``` …running that with `node example.js` yields: ```html Hi!

Hello!

``` ## API This package exports the identifier [`rehype`][api-rehype]. There is no default export. ### `rehype()` Create a new unified processor that already uses [`rehype-parse`][rehype-parse] and [`rehype-stringify`][rehype-stringify]. You can add more plugins with `use`. See [`unified`][unified] for more information. ## Examples ### Example: passing options to `rehype-parse`, `rehype-stringify` When you use `rehype-parse` or `rehype-stringify` manually you can pass options directly to them with `use`. Because both plugins are already used in `rehype`, that’s not possible. To define options for them, you can instead pass options to `data`: ```js import {rehype} from 'rehype' import {reporter} from 'vfile-reporter' const file = await rehype() .data('settings', { emitParseErrors: true, fragment: true, preferUnquoted: true }) .process('

') console.error(reporter(file)) console.log(String(file)) ``` …yields: ```txt 1:21-1:21 warning Unexpected duplicate attribute duplicate-attribute hast-util-from-html ⚠ 1 warning ``` ```html

``` ## Syntax HTML is parsed and serialized according to WHATWG HTML (the living standard), which is also followed by all browsers. ## Syntax tree The syntax tree format used in rehype is [hast][]. ## Types This package is fully typed with [TypeScript][]. It exports no additional types. ## 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, `rehype@^13`, compatible with Node.js 16. ## Security As **rehype** works on HTML, and improper use of HTML can open you up to a [cross-site scripting (XSS)][xss] attack, use of rehype can also be unsafe. Use [`rehype-sanitize`][rehype-sanitize] to make the tree safe. Use of rehype plugins could also open you up to other attacks. Carefully assess each plugin and the risks involved in using them. For info on how to submit a report, see our [security policy][security]. ## Contribute See [`contributing.md`][contributing] in [`rehypejs/.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. ## Sponsor Support this effort and give back by sponsoring on [OpenCollective][collective]!

Vercel	Motif		HashiCorp		GitBook		Gatsby

Netlify	Coinbase	ThemeIsle	Expo	Boost Note	Markdown Space	Holloway
	You?

## License [MIT][license] © [Titus Wormer][author] [build-badge]: https://github.com/rehypejs/rehype/workflows/main/badge.svg [build]: https://github.com/rehypejs/rehype/actions [coverage-badge]: https://img.shields.io/codecov/c/github/rehypejs/rehype.svg [coverage]: https://codecov.io/github/rehypejs/rehype [downloads-badge]: https://img.shields.io/npm/dm/rehype.svg [downloads]: https://www.npmjs.com/package/rehype [size-badge]: https://img.shields.io/bundlejs/size/rehype [size]: https://bundlejs.com/?q=rehype [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/rehypejs/rehype/discussions [health]: https://github.com/rehypejs/.github [security]: https://github.com/rehypejs/.github/blob/main/security.md [contributing]: https://github.com/rehypejs/.github/blob/main/contributing.md [support]: https://github.com/rehypejs/.github/blob/main/support.md [coc]: https://github.com/rehypejs/.github/blob/main/code-of-conduct.md [license]: https://github.com/rehypejs/rehype/blob/main/license [author]: https://wooorm.com [esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c [npm]: https://docs.npmjs.com/cli/install [esmsh]: https://esm.sh [unified]: https://github.com/unifiedjs/unified [rehype]: https://github.com/rehypejs/rehype [hast]: https://github.com/syntax-tree/hast [xss]: https://en.wikipedia.org/wiki/Cross-site_scripting [typescript]: https://www.typescriptlang.org [rehype-parse]: ../rehype-parse/ [rehype-stringify]: ../rehype-stringify/ [rehype-cli]: ../rehype-cli/ [rehype-sanitize]: https://github.com/rehypejs/rehype-sanitize [rehype-dom]: https://github.com/rehypejs/rehype-dom/tree/main/packages/rehype-dom [api-rehype]: #rehype-1

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