csstree/csstree

Health v2 · maintenance only

Adoption not part of the score

2118 stars · 129 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

CSSTree is a JavaScript tool set for CSS that includes a fast, detailed parser (CSS to AST), AST walker, generator (AST to CSS), and lexer for syntax validation based on W3C specs and browser implementations. It is designed for efficiency and spec compliance, focusing on CSS analysis and source-to-source transformation tasks.

Use cases

• parse css into an ast
• validate css declaration values against w3c syntaxes
• traverse and transform css ast nodes
• generate css from an ast
• build a css minifier or optimizer
• analyze css in a build tool or framework compiler

When to choose

• you need a fast, spec-compliant CSS parser with adjustable detail level
• you need tolerant error handling that preserves invalid content for later processing
• you are building CSS analysis, transformation, or minification tooling
• you need to validate CSS values against W3C and vendor-specific syntaxes

When to avoid

• you only need simple string-level CSS minification without AST manipulation
• you need a full CSS linter with style rules out of the box
• you work in a non-JavaScript ecosystem

Facets

library · maturity stable

parser serialization developer-tools web-development frontend parsers cross-platform css ast lexer walker code-generator w3c-specs css-validation source-to-source-transform nodejs javascript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="csstree/csstree")