Perform lighthouse reports in bulk with this NodeJS script.
- Download the repo
- Install dependencies
npm installoryarn - Add the urls you want to check as an array in this file
config/urls.js - (Optional) Add the config you want to test in
config/options.js. More info here - Run
node index.js
When you run the script a report will be created when the script finishes its execution.
IMPORTANT:
- The script uses lab data from the options that you pass to lighthouse to be emulated
- The output report filename is the current date + lighthouseReport.json (i.e. 09-04-2021-lighthouseReport.json)
- The report is a JSON file
The metrics that we are currently tracking for desktop & mobile devices are:
- Lighthouse score
- Core Web vitals:
- LCP
- CLS
- FID
- FCP
- Speed Index
- Time to interactive
Here you can see part of a sample report:
{
"https://skype.en.softonic.com/": {
"desktop": {
"lighthouse": 98,
"fcp": {
"id": "first-contentful-paint",
"title": "First Contentful Paint",
"description": "First Contentful Paint marks the time at which the first text or image is painted. [Learn more](https://web.dev/first-contentful-paint/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 461.97400000000005,
"numericUnit": "millisecond",
"displayValue": "0.5 s"
},
"lcp": {
"id": "largest-contentful-paint",
"title": "Largest Contentful Paint",
"description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more](https://web.dev/lighthouse-largest-contentful-paint/)",
"score": 0.95,
"scoreDisplayMode": "numeric",
"numericValue": 997.8340000000001,
"numericUnit": "millisecond",
"displayValue": "1.0 s"
},
"speedIndex": {
"id": "speed-index",
"title": "Speed Index",
"description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more](https://web.dev/speed-index/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 481.902222332824,
"numericUnit": "millisecond",
"displayValue": "0.5 s"
},
"cls": {
"id": "cumulative-layout-shift",
"title": "Cumulative Layout Shift",
"description": "Cumulative Layout Shift measures the movement of visible elements within the viewport. [Learn more](https://web.dev/cls/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 0.00020400031875049805,
"numericUnit": "unitless",
"displayValue": "0",
"details": {
"type": "debugdata",
"items": [
{
"finalLayoutShiftTraceEventFound": true
}
]
}
},
"fid": {
"id": "max-potential-fid",
"title": "Max Potential First Input Delay",
"description": "The maximum potential First Input Delay that your users could experience is the duration of the longest task. [Learn more](https://web.dev/lighthouse-max-potential-fid/).",
"score": 0.95,
"scoreDisplayMode": "numeric",
"numericValue": 106,
"numericUnit": "millisecond",
"displayValue": "110 ms"
},
"interactive": {
"id": "interactive",
"title": "Time to Interactive",
"description": "Time to interactive is the amount of time it takes for the page to become fully interactive. [Learn more](https://web.dev/interactive/).",
"score": 0.95,
"scoreDisplayMode": "numeric",
"numericValue": 2106.2595,
"numericUnit": "millisecond",
"displayValue": "2.1 s"
}
}