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https://github.com/remarkjs/remark-lint-no-dead-urls

Ensure that external links in your Markdown are alive
https://github.com/remarkjs/remark-lint-no-dead-urls

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Ensure that external links in your Markdown are alive

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README 

        
# remark-lint-no-dead-urls



[![Build][badge-build-image]][badge-build-url]

[![Coverage][badge-coverage-image]][badge-coverage-url]

[![Downloads][badge-downloads-image]][badge-downloads-url]

[![Size][badge-size-image]][badge-size-url]

[![Sponsors][badge-sponsors-image]][badge-collective-url]

[![Backers][badge-backers-image]][badge-collective-url]

[![Chat][badge-chat-image]][badge-chat-url]



**[`remark-lint`][github-remark-lint]** rule to warn when URLs are dead.



## Contents



* [What is this?](#what-is-this)

* [When should I use this?](#when-should-i-use-this)

* [Install](#install)

* [Use](#use)

* [API](#api)

  * [`Options`](#options)

  * [`unified().use(remarkLintNoDeadUrls[, options])`](#unifieduseremarklintnodeadurls-options)

* [Related](#related)

* [Contribute](#contribute)

* [License](#license)



## What is this?



This package checks whether URLs are alive or not.



## When should I use this?



You can use this package to check that URLs are alive.



It’s similar to [`remark-validate-links`][github-remark-validate-links],

but there’s an important difference.

That package checks the file system locally:

whether `path/to/example.md` exists.

But `remark-lint-no-dead-urls` checks the internet:

whether `https://a.com` is alive,

`/docs/example` is reachable on `https://mydomain.com`,

and even whether certain IDs exist on a web page.



This package uses [`dead-or-alive`][github-dead-or-alive].

You can use it when you want to check URLs programmatically yourself.



## Install



This package is [ESM only][github-gist-esm].

In Node.js (version 16+),

install with [npm][npm-install]:



```sh

npm install remark-lint-no-dead-urls

```



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



```js

import remarkLintNoDeadUrls from 'https://esm.sh/remark-lint-no-dead-urls@1'

```



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



```html



  import remarkLintNoDeadUrls from 'https://esm.sh/remark-lint-no-dead-urls@1?bundle'



```



## Use



On the API:



```js

import remarkLint from 'remark-lint'

import remarkLintNoDeadUrls from 'remark-lint-no-dead-urls'

import remarkParse from 'remark-parse'

import remarkStringify from 'remark-stringify'

import {read} from 'to-vfile'

import {unified} from 'unified'

import {reporter} from 'vfile-reporter'



const file = await read('example.md')



await unified()

  .use(remarkParse)

  .use(remarkLint)

  .use(remarkLintNoDeadUrls)

  .use(remarkStringify)

  .process(file)



console.error(reporter(file))

```



On the CLI:



```sh

remark --frail --use remark-lint --use remark-lint-no-dead-urls .

```



On the CLI in a config file (here a `package.json`):



```diff

 …

 "remarkConfig": {

   "plugins": [

     …

     "remark-lint",

+    "remark-lint-no-dead-urls",

     …

   ]

 }

 …

```



## API



This package exports no identifiers.

It exports the additional [TypeScript][] type

[`Options`][api-options].

The default export is

[`remarkLintNoDeadUrls`][api-remark-lint-no-dead-urls].



### `Options`



Configuration (TypeScript type).



###### Fields



* `deadOrAliveOptions` (`Options` from `dead-or-alive`, optional)

  — options passed to `dead-or-alive`;

  `deadOrAliveOptions.findUrls` is always off as further URLs are not used

  by `remark-lint-no-dead-urls`

* `from` (`string`, optional, example: `'https://example.com/from'`)

  — check relative values relative to this URL;

  you can also define this by setting `origin` and `pathname` in

  `file.data.meta`

* `skipLocalhost` (`boolean`, default: `false`)

  — whether to ignore `localhost` links such as `http://localhost/*`,

  `http://127.0.0.1/*`;

  shortcut for a skip pattern of

  `/^(https?:\/\/)(localhost|127\.0\.0\.1)(:\d+)?/`

* `skipOffline` (`boolean`, default: `false`)

  — whether to let offline runs pass quietly

* `skipUrlPatterns` (`Array`, optional)

  — list of patterns for URLs that should be skipped;

  each URL will be tested against each pattern and will be ignored if

  `new RegExp(pattern).test(url) === true`



### `unified().use(remarkLintNoDeadUrls[, options])`



Warn when URLs are dead.



###### Notes



To improve performance,

decrease `deadOrAliveOptions.maxRetries` and/or decrease the value used

for `deadOrAliveOptions.sleep`.

The normal behavior is to assume connections might be flakey and to sleep a

while and retry a couple times.



If you do not care about whether anchors work and HTML redirects you can

pass `deadOrAliveOptions.checkAnchor: false` and

`deadOrAliveOptions.followMetaHttpEquiv: false`,

which enables a fast path without parsing HTML.



###### Parameters



* `options` ([`Options`][api-options], optional)

  — configuration



###### Returns



Transform (`(tree: Root, file: VFile) => Promise`).



## Related



* [`remark-lint`][github-remark-lint]

  — markdown code style linter

* [`remark-validate-links`][github-remark-validate-links]

  — ensure external links are alive



## Contribute



See [`contributing.md`][health-contributing] in [`remarkjs/.github`][health]

for ways to get started.

See [`support.md`][health-support] for ways to get help.



This project has a [code of conduct][health-coc].

By interacting with this repository, organization, or community you agree to

abide by its terms.



## License



[MIT][file-license] © [David Clark][github-david-clark]



[api-remark-lint-no-dead-urls]: #unifieduseremarklintnodeadurls-options



[api-options]: #options



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



[badge-build-image]: https://github.com/remarkjs/remark-lint-no-dead-urls/actions/workflows/main.yml/badge.svg



[badge-build-url]: https://github.com/remarkjs/remark-lint-no-dead-urls/actions



[badge-collective-url]: https://opencollective.com/unified



[badge-coverage-image]: https://img.shields.io/codecov/c/github/remarkjs/remark-lint-no-dead-urls.svg



[badge-coverage-url]: https://codecov.io/github/remarkjs/remark-lint-no-dead-urls



[badge-downloads-image]: https://img.shields.io/npm/dm/remark-lint-no-dead-urls.svg



[badge-downloads-url]: https://www.npmjs.com/package/remark-lint-no-dead-urls



[badge-size-image]: https://img.shields.io/bundlejs/size/remark-lint-no-dead-urls



[badge-size-url]: https://bundlejs.com/?q=remark-lint-no-dead-urls



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



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



[badge-chat-url]: https://github.com/remarkjs/remark/discussions



[esm-sh]: https://esm.sh



[file-license]: license



[github-david-clark]: https://github.com/davidtheclark



[github-dead-or-alive]: https://github.com/wooorm/dead-or-alive



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



[github-remark-validate-links]: https://github.com/remarkjs/remark-validate-links



[github-remark-lint]: https://github.com/remarkjs/remark-lint



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



[health-contributing]: https://github.com/remarkjs/.github/blob/main/contributing.md



[health-support]: https://github.com/remarkjs/.github/blob/main/support.md



[health]: https://github.com/remarkjs/.github



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



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