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):
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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