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Validation Libraries

css-tree

A tool set for CSS: fast detailed parser (CSS → AST), walker (AST traversal), generator (AST → CSS) and lexer (validation and matching) based on specs

4.5Updated 2026-11-041 min read

At a glance

Weekly Downloads
175,396,949
Dependent Packages
1,251
License
MIT
First Published
2016

The breakdown

Css-tree carries no subscription fee, making it a $0 entry point into validation libraries.

css-tree is a standout performer on our rating metric, scoring 4.5 out of 5 on our rating metric.

Over the period tracked, css-tree has seen rapid user growth, expanding roughly 249% over the past 4 years.

css-tree trails the validation libraries average on every metric we track (0 of 3).

with roots going back to 2016, css-tree is a long-tenured option in this category.

css-tree compared to the field

Featurecss-treeValidation Libraries average
Weekly Downloads175,396,949305,152,451
Dependent Packages1,25134,727
Popularity score4.5 / 54.6 / 5

The trade-offs

Strengths

  • Free to use, with no paid tier required to get started.

Watch-outs

  • Weekly Downloads trails the category average: 175,396,949 vs. 305,152,451.
  • Dependent Packages trails the category average: 1,251 vs. 34,727.
  • Falls short on popularity score — 4.5 / 5 against a category average of 4.6 / 5.
  • Growing fast enough that current figures may shift quickly — verify before relying on them.

Growth over time

3742.7M202220232026

Quick answers

Is css-tree free to use?

Yes — css-tree is free, with no paid tier required to get started.

Is css-tree good? What's its rating?

css-tree scores 4.5 out of 5 on our rating metric, versus a Validation Libraries category average of 4.6.

How many people use css-tree?

css-tree has roughly 175.4M users/stars tracked, compared to a category average of 305.2M.

When was css-tree founded?

css-tree was founded in 2016, making it 10 years old.

Is css-tree growing?

Yes — usage is up roughly 249% over the past 4 years.

Ready to see css-tree for yourself?

Opens the official site in a new tab.

Visit css-tree

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