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unified — parse content into syntax trees, transform it with plugins, and serialize the result

OSS scale score 190.6OSS health 58Update pace 0 commits/30d
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Stars
5,034
Primary language
JavaScript
License
MIT
Repository last updated
Apr 29, 2026

Overview

unified is a content-processing core for treating Markdown, HTML, and other content as syntax trees. Plugins can inspect and transform those trees, connecting ecosystems such as remark, rehype, and retext for linting, conversion, and generation workflows.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Build parse → transform → stringify pipelines

A parser turns input into a syntax tree, plugins inspect or transform it, and a compiler serializes the result as part of a configured processor.

Sources: [2]

Connect remark, rehype, and retext ecosystems

Different content ecosystems can be combined to move between Markdown, HTML, natural-language processing, and custom syntax-tree operations.

Sources: [2][3]

For Markdown tooling, document conversion, and static-site pipelines

It fits systems that need AST-based linting, transformation, HTML generation, or custom content processors.

Sources: [2]

The core needs plugins and assumes an ESM environment

unified alone has no parser or compiler, so a working pipeline needs plugins. The current release is ESM-only; check the documented Node.js compatibility before adoption.

Sources: [2][4]

Official sources

  1. [1]unifiedjs/unified repository(2026-09-21)
  2. [2]unified README(2026-09-21)
  3. [3]unified website(2026-09-21)
  4. [4]unified package(2026-09-21)
  5. [5]unified MIT license(2026-09-21)
Supplemental curator note

`unified` itself has no parser or compiler; it becomes useful when combined with plugins such as remark-parse and rehype-stringify. The current package is 11.0.5, ESM-only, and its README targets Node.js 16+. If a project only processes Markdown, using remark directly may be simpler.

Try it in 3 steps

  1. 1

    Install unified and transformation plugins

    Use a minimal Markdown parser, Markdown-to-HTML bridge, and HTML serializer to exercise the README processing model.

    npm install unified remark-parse remark-rehype rehype-stringify
  2. 2

    Build the processor

    Connect parse, transform, and stringify plugins in order.

    unified().use(remarkParse).use(remarkRehype).use(rehypeStringify)
  3. 3

    Transform Markdown to HTML

    Process a Markdown string and inspect the generated HTML through String(file).

    await processor.process('# Hello world!')
Check the official README

Growth

Growth trends · Last 30 days

5,034 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
0
Open PRs
1

Development activity is still being collected.

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GitHub data

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GitHub Topics

  • syntax-tree
  • ast
  • cst
  • javascript
  • processor
  • plugins
  • vfile
  • unist
Stars
5,034
Forks
129
Watchers
32
Open issues
0
Contributors
22
Primary language
JavaScript
License
MIT
Repository last updated
Apr 29, 2026
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