remark-embed-images

remark plugin to embed local images as data URIs.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • unified().use(remarkEmbedImages)
• Types
• Compatibility
• Security
• Related
• Contribute
• License

What is this?

This package is a unified (remark) plugin that inlines images as data URIs.

unified is a project that transforms content with abstract syntax trees (ASTs). remark adds support for markdown to unified. mdast is the markdown AST that remark uses. This is a remark plugin that transforms mdast.

When should I use this?

You can use this package when you want to move markdown that references local images around more easily, because images will be inlined. This does makes the markdown quite hard to read and isn’t supported everywhere (such as GitHub), because data URIs might result in security risks.

Install

This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:

npm install remark-embed-images

In Deno with esm.sh:

import remarkEmbedImages from 'https://esm.sh/remark-embed-images@3'

In browsers with esm.sh:

<script type="module">
  import remarkEmbedImages from 'https://esm.sh/remark-embed-images@3?bundle'
</script>

Use

Say we have an image foo.png and next to it the following file example.md:

![A pink square](./foo.png)

And our module example.js looks as follows:

import {read} from 'to-vfile'
import {remark} from 'remark'
import remarkEmbedImages from 'remark-embed-images'

main()

async function main() {
  const file = await remark()
    .use(remarkEmbedImages)
    .process(await read('example.md'))

  console.log(String(file))
}

Now running node example.js yields:

![A pink square](data:image/png;base64,iVBORw0…)

API

This package exports no identifiers. The default export is remarkEmbedImages.

unified().use(remarkEmbedImages)

Plugin to embed local images as data URIs. There are no options.

Types

This package is fully typed with TypeScript. There are no extra exported types.

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

This plugin works with unified version 6+ and remark version 7+.

Security

Always be careful with user input. For example, it’s possible to hide JavaScript inside images (such as GIFs, WebPs, and SVGs). User provided images open you up to a cross-site scripting (XSS) attack.

Related

• remarkjs/remark-images — add a simpler image syntax
• remarkjs/remark-unwrap-images — remove the wrapping paragraph for images

Contribute

See contributing.md in remarkjs/.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.

License

MIT © David Herges