Lighthouse Bulk Checker

Perform lighthouse reports in bulk with this NodeJS script.

Getting started

1. Download the repo
2. Install dependencies npm install or yarn
3. Add the urls you want to check as an array in this file config/urls.js
4. (Optional) Add the config you want to test in config/options.js. More info here
5. Run node index.js

Reports

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

Output

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"
   }
  }