https://maryco.github.io/gaaa/
This is a Chrome extension that gives you visibility into what is being sent to Google Analytics.

1. Download archive file
2. In Chrome, select "More tools" > "Extensions" to open the extension management screen
3. Turn on "Developer Mode" on the top right
4. Click "Load unpackaged extension" and select the downloaded and unzipped directory
5. GA is roughly caught by viewing any site and enabling this extension. (Example of sites using GA: https://about.google/)