remark-stringify

What is remark-stringify?

The remark-stringify package is a plugin for the remark ecosystem that allows you to serialize Markdown Abstract Syntax Trees (ASTs) into Markdown text. It is commonly used in conjunction with other remark plugins to process and transform Markdown content programmatically.

What are remark-stringify's main functionalities?

Basic Markdown Serialization

This feature allows you to convert a Markdown AST into a Markdown string. The example demonstrates how to serialize a simple AST representing a paragraph with the text 'Hello, world!'.

const remark = require('remark');
const stringify = require('remark-stringify');

const markdownAST = {
  type: 'root',
  children: [
    { type: 'paragraph', children: [{ type: 'text', value: 'Hello, world!' }] }
  ]
};

const markdownText = remark().use(stringify).stringify(markdownAST);
console.log(markdownText); // Outputs: 'Hello, world!\n'

Customizing Output

This feature allows you to customize the output format of the serialized Markdown. The example shows how to set options for bullet points and fenced code blocks.

const remark = require('remark');
const stringify = require('remark-stringify');

const markdownAST = {
  type: 'root',
  children: [
    { type: 'paragraph', children: [{ type: 'text', value: 'Hello, world!' }] }
  ]
};

const markdownText = remark()
  .use(stringify, { bullet: '*', fences: true })
  .stringify(markdownAST);
console.log(markdownText); // Outputs: 'Hello, world!\n'

Handling Complex ASTs

This feature demonstrates how to handle more complex ASTs, including headings, paragraphs, and lists. The example shows how to serialize an AST with multiple types of nodes.

const remark = require('remark');
const stringify = require('remark-stringify');

const markdownAST = {
  type: 'root',
  children: [
    { type: 'heading', depth: 1, children: [{ type: 'text', value: 'Title' }] },
    { type: 'paragraph', children: [{ type: 'text', value: 'This is a paragraph.' }] },
    { type: 'list', ordered: false, children: [
      { type: 'listItem', children: [{ type: 'paragraph', children: [{ type: 'text', value: 'Item 1' }] }] },
      { type: 'listItem', children: [{ type: 'paragraph', children: [{ type: 'text', value: 'Item 2' }] }] }
    ] }
  ]
};

const markdownText = remark().use(stringify).stringify(markdownAST);
console.log(markdownText); // Outputs: '# Title\n\nThis is a paragraph.\n\n* Item 1\n* Item 2\n'

Other packages similar to remark-stringify

markdown-it

Markdown-it is a fast and flexible Markdown parser that can also be used to render Markdown from an AST. It offers a wide range of plugins and customization options, making it a versatile alternative to remark-stringify.

marked

Marked is a low-level Markdown compiler that allows for extensive customization. It is known for its speed and flexibility, making it a good choice for projects that require fine-grained control over Markdown rendering.

showdown

Showdown is a bidirectional Markdown to HTML converter that can also be used to serialize Markdown from an AST. It is easy to use and offers a range of extensions for additional functionality.

README

remark-stringify

remark plugin to add support for serializing markdown.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • unified().use(remarkStringify[, options])
• Syntax
• Syntax tree
• Types
• Security
• Contribute
• Sponsor
• License

What is this?

This package is a unified (remark) plugin that defines how to take a syntax tree as input and turn it into serialized markdown.

This plugin is built on mdast-util-to-markdown, which turns mdast syntax trees into a string. remark focusses on making it easier to transform content by abstracting such internals away.

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 defines how mdast is turned into markdown.

When should I use this?

This plugin adds support to unified for serializing markdown. You can alternatively use remark instead, which combines unified, remark-parse, and this plugin.

You can combine this plugin with other plugins to add syntax extensions. Notable examples that deeply integrate with it are remark-gfm, remark-mdx, remark-frontmatter, remark-math, and remark-directive. You can also use any other remark plugin before remark-stringify.

If you want to handle syntax trees manually, you can use mdast-util-to-markdown.

Install

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

npm install remark-stringify

In Deno with esm.sh:

import remarkStringify from 'https://esm.sh/remark-stringify@10'

In browsers with esm.sh:

<script type="module">
  import remarkStringify from 'https://esm.sh/remark-stringify@10?bundle'
</script>

Use

Say we have the following module example.js:

import {unified} from 'unified'
import rehypeParse from 'rehype-parse'
import rehypeRemark from 'rehype-remark'
import remarkStringify from 'remark-stringify'

main()

async function main() {
  const file = await unified()
    .use(rehypeParse)
    .use(rehypeRemark)
    .use(remarkStringify, {
      bullet: '*',
      fence: '~',
      fences: true,
      incrementListMarker: false
    })
    .process('<h1>Hello, world!</h1>')

  console.log(String(file))
}

Running that with node example.js yields:

# Hello, world!

API

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

unified().use(remarkStringify[, options])

Add support for serializing markdown. Options are passed to mdast-util-to-markdown: all formatting options are supported.

options

Configuration (optional).

options.bullet

Marker to use for bullets of items in unordered lists ('*', '+', or '-', default: '*').

options.bulletOther

Marker to use in certain cases where the primary bullet doesn’t work ('*', '+', or '-', default: depends). See mdast-util-to-markdown for more information.

options.bulletOrdered

Marker to use for bullets of items in ordered lists ('.' or ')', default: '.').

options.bulletOrderedOther

Marker to use in certain cases where the primary bullet for ordered items doesn’t work ('.' or ')', default: none). See mdast-util-to-markdown for more information.

options.closeAtx

Whether to add the same number of number signs (#) at the end of an ATX heading as the opening sequence (boolean, default: false).

options.emphasis

Marker to use for emphasis ('*' or '_', default: '*').

options.fence

Marker to use for fenced code ('`' or '~', default: '`').

options.fences

Whether to use fenced code always (boolean, default: false). The default is to use fenced code if there is a language defined, if the code is empty, or if it starts or ends in blank lines.

options.incrementListMarker

Whether to increment the counter of ordered lists items (boolean, default: true).

options.listItemIndent

How to indent the content of list items ('one', 'tab', or 'mixed', default: 'tab'). Either with the size of the bullet plus one space (when 'one'), a tab stop ('tab'), or depending on the item and its parent list ('mixed', uses 'one' if the item and list are tight and 'tab' otherwise).

options.quote

Marker to use for titles ('"' or "'", default: '"').

options.resourceLink

Whether to always use resource links (boolean, default: false). The default is to use autolinks (<https://example.com>) when possible and resource links ([text](url)) otherwise.

options.rule

Marker to use for thematic breaks ('*', '-', or '_', default: '*').

options.ruleRepetition

Number of markers to use for thematic breaks (number, default: 3, min: 3).

options.ruleSpaces

Whether to add spaces between markers in thematic breaks (boolean, default: false).

options.setext

Whether to use setext headings when possible (boolean, default: false). The default is to always use ATX headings (# heading) instead of setext headings (heading\n=======). Setext headings can’t be used for empty headings or headings with a rank of three or more.

options.strong

Marker to use for strong ('*' or '_', default: '*').

options.tightDefinitions

Whether to join definitions without a blank line (boolean, default: false). The default is to add blank lines between any flow (“block”) construct.

options.handlers

This option is a bit advanced as it requires knowledge of ASTs, so we defer to the documentation available in mdast-util-to-markdown.

options.join

This option is a bit advanced as it requires knowledge of ASTs, so we defer to the documentation available in mdast-util-to-markdown.

options.unsafe

This option is a bit advanced as it requires deep knowledge of markdown, so we defer to the documentation available in mdast-util-to-markdown.

Syntax

Markdown is serialized according to CommonMark but care is taken to format in such a way that the resulting markdown should work with most markdown parsers. Other plugins can add support for syntax extensions.

Syntax tree

The syntax tree format used in remark is mdast.

Types

This package is fully typed with TypeScript. An Options type is exported, which models the interface of accepted options.

Security

As markdown can be turned into HTML and improper use of HTML can open you up to cross-site scripting (XSS) attacks, use of remark can be unsafe. When going to HTML, you will likely combine remark with rehype, in which case you should use rehype-sanitize.

Use of remark 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.

Contribute

See contributing.md in remarkjs/.github for ways to get started. See support.md for ways to get help. Join us in Discussions to chat with the community and contributors.

This project has a code of conduct. 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!

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License

MIT © Titus Wormer