Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time


Parker is a stylesheet analysis tool. It runs metrics on your stylesheets and will report on their complexity.

Build Status


Install with npm:

npm install -g parker


Measuring Local Stylesheets

parker a.css b.css c.css
parker css/

Measuring a Remote Stylesheet Using Curl

curl -s | parker -s

Output JSON

parker example.css --format=json

Programmatic usage

After installing parker as a dependency in your project, you can use it as follows:

var Parker = require('parker/lib/Parker');
var metrics = require('parker/metrics/All'); // Or an array of the metrics you want to measure

var file = fs.readFile('test.css', function (err, data) {
	if (err) throw err;

	var parker = new Parker(metrics);
	var results =;

	// Do something with results


Documentation can be found in markdown format the docs folder.


From the repo root:

npm install
npm test


Pull requests, issues, new unit tests, code reviews and good advice are all things that would make a difference to Parker. You can even contribute by telling me how useful Parker is to you; please let me know on Twitter at @katie_fenn. Any time generously donated to helping make Parker better is gratefully accepted, and in return I shall do my best to merge contributions.

Please target pull requests at the "develop" branch.


Parker is my first open source project, and your suggestions and feedback are welcome. The project is in a pre-beta phase and is liable to change at any time. Parker is named for the character Parker from Gerry Anderson's Thunderbirds, without which my interest in technology and computers would certainly not be what it is today. Parker is Nosey about your stylesheets.