hubspot-form-analyzer is a lightweight extension for Chrome/Chromium that scans your webpages for HubSpot forms and exposes hidden fields when available.
This extension can be helpful when debugging HubSpot forms.
You can view or fork the source code as you like, but installation through the Chrome Web Store (updated link!) is recommended.
This extension can be useful to you if you work a lot with HubSpot embedded forms. Check the article about debugging HubSpot embedded forms to read more about it.
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.