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Lighthouse PWA Analysis Tool

Codelab: Auditing with Lighthouse


How do I tell if all of my Progressive Web App (PWA) features are in order? Lighthouse is an open-source tool from Google that audits a web app for PWA features. It provides a set of metrics to help guide you in building a PWA with a full application-like experience for your users.

Lighthouse tests if your app:

  • Can load in offline or flaky network conditions
  • Is relatively fast
  • Is served from a secure origin
  • Uses certain accessibility best practices

Lighthouse is available as a Chrome extension for Chrome 52 (and later) and a command line tool.

Running Lighthouse as a Chrome extension

Download the Lighthouse Chrome extension from the Chrome Web Store.

When installed it places an Lighthouse Icon icon in your taskbar.

Run Lighthouse on your application by selecting the icon and choosing Generate report (with your app open in the browser page).

Lighthouse extension showing generate report button

Lighthouse generates an HTML page with the results. An example page is shown below.

Lighthouse report

Running Lighthouse from the command line

If you want to run Lighthouse from the command line (for example, to integrate it with a build process) it is available as a Node module.

You can download Node from nodejs.org (select the version that best suits your environment and operating system).

To install Lighthouse's Node module from the command line, use the following command:

npm install -g lighthouse

This installs the tool globally. You can then run Lighthouse from the command line (where https://airhorner.com/ is your app):

lighthouse https://airhorner.com/

You can check Lighthouse flags and options with the following command:

lighthouse --help