Velite

MDX

mdx-js/mdx

Popular

Markdown with embedded JSX components; the standard authoring format for modern docs and content sites.

unified

unifiedjs/unified

Popular

Syntax-tree content pipeline behind remark (Markdown) and rehype (HTML), with hundreds of plugins.

markdown-it

markdown-it/markdown-it

Popular

Fast, CommonMark-compliant Markdown parser for JavaScript with a rich plugin ecosystem.

marked

markedjs/marked

Popular

Low-level, very fast Markdown compiler for JavaScript, built for speed.

Shiki

shikijs/shiki

Popular

Syntax highlighter using TextMate grammars and VS Code themes; the standard in modern docs frameworks.

Content Collections

sdorra/content-collections

Rising

Type-safe content layer that turns Markdown/MDX files into validated, typed data for many frameworks.

Markdoc

markdoc/markdoc

Stripe's Markdown-based authoring framework with custom tags, validation and rendering.

Contentlayer

contentlayerdev/contentlayer

Legacy

Type-safe content SDK for Next.js, abandoned in 2024; forks like contentlayer2 or Velite replace it.