tldr/pages/common/lighthouse.md

lighthouse

Analyzes web applications and web pages, collecting modern performance metrics and insights on developer best practices. More information: https://github.com/GoogleChrome/lighthouse.

• Generate an HTML report for a specific website and save it to a file in the current directory:

lighthouse {{https://example.com}}

• Generate a JSON report and print it:

lighthouse --output {{json}} {{https://example.com}}

• Generate a JSON report and save it to a specific file:

lighthouse --output {{json}} --output-path {{path/to/file.json}} {{https://example.com}}

• Generate a report using the browser in headless mode without logging to stdout:

lighthouse --quiet --chrome-flags="{{--headless}}" {{https://example.com}}

• Generate a report, using the HTTP header key/value pairs in the specified JSON file for all requests:

lighthouse --extra-headers={{path/to/file.json}} {{https://example.com}}

• Generate a report for specific categories only:

lighthouse --only-categories={{performance,accessibility,best-practices,seo,pwa}} {{https://example.com}}

• Generate a report with device emulation and all throttling disabled:

lighthouse --screenEmulation.disabled --throttling-method={{provided}} --no-emulatedUserAgent {{https://example.com}}

• Display help:

lighthouse --help