Headless Chromium-based modular web performance metrics collector. And why phantomas? Well, because :)

• NodeJS 16+

npm install phantomas

This will install a recent version of Chromium supported by puppeteer module.

You can use phantomas Docker image:

docker pull macbre/phantomas:latest

Or you can fetch from GitHub's Containers registry

docker pull ghcr.io/macbre/phantomas:latest

You can get support for phantomas via xs:code.

const phantomas = require('phantomas'),
    promise = phantomas('https://example.com/');
promise.
    then(results => {
        console.log('Metrics', results.getMetrics());
        console.log('Offenders', results.getAllOffenders());
    }).
    catch(res => {
        console.error(res);
    });
// events handling
promise.on('recv', response => {
    console.log('Response: %s %s [%s]', response.method, response.url, response.contentType);
});
// including the custom one emitted by phantomas modules
promise.on('domQuery', (type, query) => {
        console.log('DOM query by %s - "%s"', type, query);
});

Or run ./examples/index.js.

To get the latest development version of phantomas (and install all required dependencies):

git clone git@github.com:macbre/phantomas.git
npm install

First you need to start a local nginx container that will serve static assets used by integration tests suite. Then simply run npm t:

./test/server-start.sh
npm t

All pull requests that are filed for this repository will have tests run via GitHub Actions.

Please refer to /Troubleshooting.md

• modular approach - each metric is generated by a separate "module"
• phantomas "core" acts as an events emitter that each module can hook into
• in-depth metrics such as: number of events bound via jQuery, calls to window.writeor complex and duplicated CSS selectors (via analyze-css)
• JSON as an output format
• easy integration with other nodejs projects via CommonJS module (see API docs)
• metrics can be emitted from JavaScript code of the page phantomas is run against (thanks to helper functions available in window.__phantomas)
• device profiles allow phantomas to emulate mobile or tablet (by setting a proper user agent and viewport)

All the contributors

• macbre
• sjhcockrell
• jgonera
• william-p
• gmetais
• vgangan
• cphoover
• wladekb
• iNem0o
• gomezd
• stefanjudis

phantomas comes as a CommonJS module (see API docs) that you can use in your nodejs projects.

You can also use it as a command line tool. Run phantomas -h for more details.

Please refer to /docs/metrics.md file for a full, up-to-date list of all available modules and metrics that phantomas emits.

• docs/ directory
• Description of events fired by phantomas core
• List of all metrics and modules

• Best Practices for Speeding Up Your Web Site (by Yahoo!)
• Web Performance Best Practices (by Google)
• Planet Performance - news and views from the web performance blogosphere
• Performance of 3rd Party Content (by Steve Souders)
• Profiling CSS for fun and profit. Optimization notes.

• Know Your Engines: How to Make Your JavaScript Fast (by David Mandelin from Mozilla)
• Velocity Conf 2013 Workshop: Avoiding Web Performance Regression (by Marcel Duran from Twitter)

Introductions to phantomas and use cases:

• phantomas – PhantomJS based, modular web performance metrics generator (an article for Performance Calendar)
• How to Measure Frontend Performance With Grunt
• MaxCDN Blog - Behind The Scenes: tools.maxcdn.com
• Measuring frontend performance
• Performance Budgets with Phantomas and Jenkins
• phantomas introduced at npmawesome.com
• Grunt.js for the Enterprise - Vol.1: Frontend Performance with Phantomas (by David Amend)
• Automated Frontend Testing at DrupalCon Austin 2014 (+video)
• Phantomas: Fais-moi un strip ! (in French)
• Untangle the JavaScript spaghetti code with YellowLabTools

• Sebastian Golasch: The Glitch in the Game (Front End Ops Conference 2014)

Use grunt to automate daily dev tasks, including your's application web performance, via these great tools:

• grunt-phantomas
• juve
• grunt-devperf