Samemark

Samemark is a markdown parser that returns the same mdast tree as remark-parse at a much faster speed.

Samemark is a high-performance markdown parser designed for JavaScript environments. It produces the exact same mdast tree as remark-parse with GitHub Flavored Markdown and falls back to the standard parser for unsupported extensions. The library includes an incremental streaming parser for chat applications and supports Node, browsers, Deno, Bun, and edge runtimes. It natively implements GFM, frontmatter, and math extensions without requiring micromark at parse time. Developers use it inside unified pipelines and React chat interfaces to reduce main-thread rendering and parsing time.

Samemark at a glance

Best for: Software engineer
Runs on: Web, Node, Deno, Bun, API
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/halleylabs/samemark

Key features

Parses markdown into standard mdast trees
Falls back to standard parsers for custom extensions
Provides incremental streaming for chat messages
Includes a React chat integration example with memoised blocks
Supports native GFM, frontmatter, and math
Runs self-check validation on processor startup

Use it for

Speeding up unified markdown processing pipelines
Streaming chat message responses in React UIs
Building static sites with Astro faster
Parsing markdown without micromark at parse time

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