-
SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Honestly, the hardest thing to figure out is the OAuth2 Handshake, token scopes, and how to update the rolling token/retry requests that fail from that. It's much more annoying to configure than the previous iteration, but not really much different than a lot of 3rd party APIs. I dug through this repo: https://github.com/Granga/etsy-ts/tree/master/src and have extended it for my needs, mostly just adding convenience functions as my application is only concerned with my shop and the repo is more generic.