Automate Google PageSpeed Insights and Core Web Vitals Logging with Apps Script
Here's a quick script to automatically monitor your Google PageSpeed Insights desktop and mobile scores for a web page, together with core web vitals (LCP, FID and CLS):
You need a spreadsheet with a tab called results and an API key for PageSpeed Insights (activate the API in the console and create an API key for it, the browser based / JavaScript option). Paste the code above into the script editor for the spreadsheet and add your API key and URL to monitor. Then just choose triggers from the Resources menu and schedule the monitor function to run once per day.
The script will log the overall PageSpeed score out of 100 for the monitored page. It also logs 75th percentile origin level core web vitals (largest contentful paint (LCP, seconds), first input delay (FID, seconds) and cumulative layout shift (CLS, percent)). If your origin does not have enough data the metric will be omitted. You can change from origin to page level web vitals if you have enough data, just change originLoadingExperience to loadingExperience in the script.
The results are repeated for desktop and mobile, so your spreadsheet header should be Desktop PSI, Desktop LCP, Desktop FID, Desktop CLS, Mobile PSI, Mobile LCP, Mobile FID, Mobile CLS.
There are a lot of other values returned (like number and types of resources on the page) that you could choose to monitor as well. It would also be easy to extend this to monitor more URLs, or to send you an email if the score drops below a threshold.
Updated May 5, 2019 to use version 5 of the PageSpeed API.
Updated June 13, 2021 to include core web vitals.
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(Published to the Fediverse as: Automate Google PageSpeed Insights and Core Web Vitals Logging with Apps Script #code #google #appsscript #gas #pagespeed How to automatically monitor page load performance using the Google PageSpeed Insights API and Apps Script )