# remark
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[![Chat][chat-badge]][chat]
[**unified**][unified] processor to parse and serialize Markdown.
Built on [micromark][].
Powered by [plugins][].
Part of the [unified][] collective.
* API by [**unified**][unified]
* Parses Markdown to a syntax tree with [`remark-parse`][parse]
* [**mdast**][mdast] syntax tree
* [Plugins][] transform the tree
* Serializes syntax trees to Markdown with [`remark-stringify`][stringify]
Don’t need the parser?
Or compiler?
[That’s OK: use **unified** directly][unified-usage].
## Install
[npm][]:
```sh
npm install remark
```
## Use
[See **unified** for more examples »][unified]
###### Common example
This example lints Markdown and turns it into HTML.
```js
var remark = require('remark')
var recommended = require('remark-preset-lint-recommended')
var html = require('remark-html')
var report = require('vfile-reporter')
remark()
.use(recommended)
.use(html)
.process('## Hello world!', function (err, file) {
console.error(report(err || file))
console.log(String(file))
})
```
Yields:
```txt
1:1 warning Missing newline character at end of file final-newline remark-lint
⚠ 1 warning
```
```html
Hello world!
```
###### Settings through data
This example prettifies Markdown and configures [`remark-stringify`][stringify]
through [data][].
```js
var remark = require('remark')
remark()
.data('settings', {emphasis: '*', strong: '*'})
.process('_Emphasis_ and __importance__', function (err, file) {
if (err) throw err
console.log(String(file))
})
```
Yields:
```markdown
*Emphasis* and **importance**
```
###### Settings through a preset
This example prettifies Markdown and configures [`remark-parse`][parse] and
[`remark-stringify`][stringify] through a [preset][].
```js
var remark = require('remark')
remark()
.use({settings: {emphasis: '*', strong: '*'}})
.process('_Emphasis_ and __importance__', function (err, file) {
if (err) throw err
console.log(String(file))
})
```
Yields:
```markdown
*Emphasis* and **importance**
```
## API
[See **unified** for API docs »][unified]
## Security
As Markdown is sometimes used for HTML, and improper use of HTML can open you up
to a [cross-site scripting (XSS)][xss] attack, use of remark can also be unsafe.
When going to HTML, use remark in combination with the [**rehype**][rehype]
ecosystem, and use [`rehype-sanitize`][sanitize] to make the tree safe.
Use of remark plugins could also open you up to other attacks.
Carefully assess each plugin and the risks involved in using them.
## Contribute
See [`contributing.md`][contributing] in [`remarkjs/.github`][health] for ways
to get started.
See [`support.md`][support] for ways to get help.
Ideas for new plugins and tools can be posted in [`remarkjs/ideas`][ideas].
A curated list of awesome remark resources can be found in [**awesome
remark**][awesome].
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]!
## License
[MIT][license] © [Titus Wormer][author]
[build-badge]: https://img.shields.io/travis/remarkjs/remark.svg
[build]: https://travis-ci.org/remarkjs/remark
[coverage-badge]: https://img.shields.io/codecov/c/github/remarkjs/remark.svg
[coverage]: https://codecov.io/github/remarkjs/remark
[downloads-badge]: https://img.shields.io/npm/dm/remark.svg
[downloads]: https://www.npmjs.com/package/remark
[size-badge]: https://img.shields.io/bundlephobia/minzip/remark.svg
[size]: https://bundlephobia.com/result?p=remark
[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/remarkjs/remark/discussions
[health]: https://github.com/remarkjs/.github
[contributing]: https://github.com/remarkjs/.github/blob/HEAD/contributing.md
[support]: https://github.com/remarkjs/.github/blob/HEAD/support.md
[coc]: https://github.com/remarkjs/.github/blob/HEAD/code-of-conduct.md
[ideas]: https://github.com/remarkjs/ideas
[awesome]: https://github.com/remarkjs/awesome-remark
[license]: https://github.com/remarkjs/remark/blob/main/license
[author]: https://wooorm.com
[npm]: https://docs.npmjs.com/cli/install
[unified]: https://github.com/unifiedjs/unified
[mdast]: https://github.com/syntax-tree/mdast
[parse]: https://github.com/remarkjs/remark/blob/main/packages/remark-parse
[stringify]: https://github.com/remarkjs/remark/blob/main/packages/remark-stringify
[plugins]: https://github.com/remarkjs/remark/blob/main/doc/plugins.md
[unified-usage]: https://github.com/unifiedjs/unified#usage
[preset]: https://github.com/unifiedjs/unified#preset
[data]: https://github.com/unifiedjs/unified#processordatakey-value
[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
[rehype]: https://github.com/rehypejs/rehype
[sanitize]: https://github.com/rehypejs/rehype-sanitize
[micromark]: https://github.com/micromark/micromark
