Awesome

phantomas

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

Requirements

NodeJS 16+

Installation

Via npm

npm install phantomas

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

Via Docker

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

Support

You can get support for phantomas via xs:code.

Usage example

const phantomas = require('phantomas'),
    promise = phantomas('http://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.

Development version

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

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

Running tests

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.

Having problems?

Please refer to /Troubleshooting.md

Features

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)

Contributors

All the contributors

Usage

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.

Metrics

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

For developers

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

Let's make Web a bit faster!

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.

Slides

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)

Blogosphere

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

Videos

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

Utilities

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