- Category
- Developer Tools
- Rank
- No. 915Tools index
- Pricing
- Open Source
- Type
- TOOL
- Builder
- denoland
- GitHub
- 242 stars
- Latest release
- 0.11.0
- Date
About
Server-side GitHub Flavored Markdown rendering for Deno — render markdown with syntax highlighting, math, and GitHub-style features.
What it does
It turns Markdown text into ready-to-embed HTML, then sanitizes that output by default. It also supplies matching light and dark styles, resolves relative links and media URLs, formats code, supports inline output, and can render equations when enabled.
Why it's ranked here
This is a focused, practical choice for Deno applications that want GitHub-like document output without assembling separate parsing, highlighting, styling, and sanitization layers. Its strongest argument is careful integration: heading anchors, alerts, footnotes, media handling, code titles, themes, and browser-tested styling work together.
What's good
Sanitization is enabled by default, while allowed tags, attributes, and classes remain configurable. Relative links and media can resolve against separate base URLs. Unknown code languages are safely encoded. Consumers also get automatic light and dark themes, custom rendering support, alerts, footnotes, emoji replacement, and optional equations.
Tradeoffs
Equation support is disabled until explicitly enabled and requires additional styles. Default syntax highlighting covers only JavaScript, Markdown, and HTML, so other languages need extra imports. Iframes require an opt-in. Disabling sanitization removes the main content-safety layer, and the package supplies rendered fragments and styles rather than a complete page system.
How to use it well
Use it in a Deno server that publishes documentation, posts, comments, or other Markdown-backed pages. Keep sanitization enabled, set base URLs for relative content, and load only the extra highlighting languages you need. It handles presentation-ready document fragments, but it does not provide content storage, editing, routing, or page templates.
Technical notes+
deno.json publishes the JSR package @deno/gfm with mod.ts as its export. mod.ts configures Marked extensions for alerts, footnotes, and GitHub-style heading IDs; subclasses Marked.Renderer; highlights through Prism; renders optional math through KaTeX; transforms media URLs; and sanitizes through sanitize-html. It exports CSS, KATEX_CSS, Marked, Renderer, render, and additional stripping utilities visible in test/test.ts. style/patch.ts builds Primer Markdown CSS and fetches pinned KaTeX assets into generated style.ts. test/test.ts checks rendering and sanitization behavior, while test/server_test.ts uses browser tests for tables, footnotes, and syntax styles. example/main.ts demonstrates a Deno HTTP server.
Observed
- License
- MIT License
- Primary language
- TypeScript
- Package
- Published on JSR as @deno/gfm
- Install surface
- Installed with deno add jsr:@deno/gfm
- Interface
- Deno library with TypeScript exports; no CLI interface is documented
- Platform
- Designed for server-side use with Deno
- Testing structure
- Repository includes unit tests, fixtures, and browser-based server tests
Read from README.md, deno.json, mod.ts, style.ts, style/patch.ts, test/test.ts, example/main.ts, test/test_utils.ts, test/server_test.ts, test/runTestServer.ts, LICENSE, style/main.scss, style/.parcelrc, example/content.md, style/package.json.
What it can do
Render GitHub Flavored Markdown to HTML
Markdown text → HTML document
Apply syntax highlighting to code blocks
Markdown with code blocks → HTML with highlighted code syntax
Process mathematical expressions
Markdown with math notation → Rendered mathematical formulas
Render GitHub-style tables
Markdown table syntax → Formatted HTML tables
Process strikethrough text
Markdown with strikethrough syntax → HTML with strikethrough formatting
Convert task lists to interactive checkboxes
Markdown task list items → HTML checkbox elements
Tags
Tech Stack
Media
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