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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.
In order to modify the code, I had to fork this project and create another branch (I called it issue-6), so that I won't bother working version. After I made some modifications, I had to make pull request, so that the owner could accept my changes and merge my branch with his main branch. I never did this before, but that's what people do in open source a lot. I enjoyed learning how to do that and providing detailed information about what I changed in the code.
I worked on this git repo and here I made pull request.