MDX Renderer [@m2d/react-markdown]

✨ A modern, SSR-compatible Markdown renderer for React with full MDAST/HAST access — built for customization, performance, and document generation - docx/pdf.

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🔥 Why @m2d/react-markdown?

@m2d/react-markdown goes beyond traditional React Markdown libraries by focusing on:

• ✅ Server-side rendering (SSR) without hooks
• ✅ Full JSX children support (not just strings)
• ✅ Access to raw MDAST & HAST trees
• ✅ Drop-in plugin support via Unified (remark, rehype, etc.)
• ✅ Custom component overrides per tag
• ✅ Integration with tools like mdast2docx

Compared to react-markdown, this library offers:

Feature	@m2d/react-markdown ✅	react-markdown ❌
Full JSX support (not just strings)	✅	❌
SSR-safe (no hooks)	✅	✅
Client Side component with memoization	✅	❌
MDAST + HAST access via astRef	✅	❌
Component-level overrides	✅	✅
Unified plugin support	✅	✅
Tiny bundle (minzipped)	~35 kB	~45 kB
Built-in DOCX-friendly AST output	✅	❌

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📦 Installation

pnpm add @m2d/react-markdown

or

npm install @m2d/react-markdown

or

yarn add @m2d/react-markdown

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🚀 Server vs Client

By default, this package is SSR-safe and has no client-specific hooks.

✅ Server (default):

import { Md } from "@m2d/react-markdown";

🔁 Client (for dynamic reactivity/memoization):

import { Md } from "@m2d/react-markdown/client";

This version supports client-side behavior with memoization and dynamic JSX rendering.

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⚡ Example: Rendering + Exporting DOCX

import { Md } from "@m2d/react-markdown/client";
import { toDocx } from "mdast2docx";
import { useRef } from "react";

const astRef = useRef([]);

export default function Page() {
  return (
    <>
      <Md astRef={astRef}>{`# Hello\n\nThis is **Markdown**.`}</Md>
      <button
        onClick={() => {
          const doc = toDocx(astRef.current[0].mdast);
          // Save or download doc
        }}>
        Export to DOCX
      </button>
    </>
  );
}

Note for Server Component use you can replace useRef with custom ref object const astRef = {current: undefined} as AstRef

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🧠 JSX-Aware Parsing

Unlike most markdown renderers, @m2d/react-markdown supports arbitrary JSX as children:

import { Mdx } from "@m2d/react-markdown/server";
// ...
<Mdx>
  <article>{"# Markdown Heading\n\nSome **rich** content."}</article>
</Mdx>;

astRef.current is an array — one per Markdown string — each with { mdast, hast }. The default <Md> export accepts only string children for better optimization.

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🎨 Component Overrides

import { Md } from "@m2d/react-markdown";
import { Unwrap, Omit } from "@m2d/react-markdown/server";

<Md
  components={{
    em: Unwrap,
    blockquote: Omit,
    code: props => <CodeBlock {...props} />,
  }}>
  {`*em is unwrapped*\n\n> blockquote is removed`}
</Md>;

Use the built-in helpers:

• Unwrap – renders only children
• Omit – removes element and content entirely
• CodeBlock - it is your custom component

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🔌 Plugin Support (Unified)

Use any remark or rehype plugin:

<Md remarkPlugins={[remarkGfm]} rehypePlugins={[rehypeSlug, rehypeAutolinkHeadings]}>
  {markdown}
</Md>

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📂 Accessing MDAST + HAST

type astRef = {
  current: { mdast: Root; hast: HastRoot }[];
};

Useful for:

• 📄 DOCX export (mdast2docx)
• 🧪 AST testing or analysis
• 🛠️ Custom tree manipulation

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📊 Performance

TL;DR: @m2d/react-markdown performs competitively with react-markdown, especially on medium and large documents.

👉 See full benchmarks →

Benchmarks include:

• Multiple markdown fixture types (short, long, complex, deeply nested)
• Plugin configurations like remark-gfm, remark-math, rehype-raw
• Visual comparisons using interactive Mermaid xychart-beta charts
• Ops/sec, ±%, and future memory profiling

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💬 Upcoming Changes – Seeking Feedback

We're proposing a major change to the internal astRef structure to better support MDX-style custom components and rendering flexibility:

👉 Join the discussion →

Key goals:

• Allow <Md> to embed child components like JSX/MDX
• Simplify recursive rendering model
• Improve performance and reduce abstraction overhead

🧭 Roadmap

• 🔄 Merge JSX + <Md> segments into unified AST
• 🧪 Structural test utilities
• 🧑‍🏫 Next.js + DOCX example

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🌍 Related Projects

• mdast2docx – Convert MDAST → .docx
• unified – Syntax tree ecosystem
• react-markdown – Popular alternative (less customizable)

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🙏 Acknowledgements

We are deeply grateful to the open-source community whose work made this project possible.

• 🌱 react-markdown – For pioneering a React-based Markdown renderer. This library builds on its ideas while extending flexibility and SSR-readiness.
• 🛠 unified – The brilliant engine powering our markdown-to-AST transformations.
• ✨ remark and rehype – For their modular ecosystems that make parsing and rendering delightful.
• 🧾 mdast2docx – Our sister project that inspired the MDAST-first architecture of this library.

💖 To the maintainers, contributors, and communities behind these projects — thank you for your generosity, vision, and dedication to making the web better for everyone.

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📘 License

Licensed under the MPL-2.0.

💡 Want to support this project? Sponsor or check out our courses!

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Built with ❤️ by Mayank Kumar Chaudhari