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rehype
Advanced tools
Readme
unified processor to add support for parsing from HTML and serializing to HTML.
This package is a unified processor with support for parsing HTML as input
and serializing HTML as output by using unified with
rehype-parse
and rehype-stringify
.
See the monorepo readme for info on what the rehype ecosystem is.
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
instead.
When you want to inspect and format HTML files in a project on the command
line, you can use rehype-cli
.
This package is ESM only. In Node.js (version 16+), install with npm:
npm install rehype
In Deno with esm.sh
:
import {rehype} from 'https://esm.sh/rehype@13'
In browsers with esm.sh
:
<script type="module">
import {rehype} from 'https://esm.sh/rehype@13?bundle'
</script>
Say we have the following module example.js
:
import {rehype} from 'rehype'
import rehypeFormat from 'rehype-format'
const file = await rehype().use(rehypeFormat).process(`<!doctype html>
<html lang=en>
<head>
<title>Hi!</title>
</head>
<body>
<h1>Hello!</h1>
</body></html>`)
console.error(String(file))
…running that with node example.js
yields:
<!doctype html>
<html lang="en">
<head>
<title>Hi!</title>
</head>
<body>
<h1>Hello!</h1>
</body>
</html>
This package exports the identifier rehype
.
There is no default export.
rehype()
Create a new unified processor that already uses
rehype-parse
and rehype-stringify
.
You can add more plugins with use
.
See unified
for more information.
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
:
import {rehype} from 'rehype'
import {reporter} from 'vfile-reporter'
const file = await rehype()
.data('settings', {
emitParseErrors: true,
fragment: true,
preferUnquoted: true
})
.process('<div title="a" title="b"></div>')
console.error(reporter(file))
console.log(String(file))
…yields:
1:21-1:21 warning Unexpected duplicate attribute duplicate-attribute hast-util-from-html
⚠ 1 warning
<div title=a></div>
HTML is parsed and serialized according to WHATWG HTML (the living standard), which is also followed by all browsers.
The syntax tree format used in rehype is hast.
This package is fully typed with TypeScript. It exports no additional types.
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.
As rehype works on HTML, and improper use of HTML can open you up to a
cross-site scripting (XSS) attack, use of rehype can also be unsafe.
Use 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.
See contributing.md
in rehypejs/.github
for ways
to get started.
See support.md
for ways to get help.
This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.
Support this effort and give back by sponsoring on OpenCollective!
Vercel |
Motif |
HashiCorp |
GitBook |
Gatsby | ||||
Netlify |
Coinbase |
ThemeIsle |
Expo |
Boost Note |
Markdown Space |
Holloway | ||
You? |
FAQs
HTML processor powered by plugins part of the unified collective
The npm package rehype receives a total of 294,134 weekly downloads. As such, rehype popularity was classified as popular.
We found that rehype demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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