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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.
With Godbolt you can view which line of assembly corresponds to which line of C. Also you can hover the mouse over each instruction to see a description of it. I really recommend it to analyze the generated assembly: https://godbolt.org/
To understand the instructions themselves, I mean all instructions nothing beat the Intel manual but you probably don't want to read it for such use case. This less complete reference might be better suited for you: https://www.felixcloutier.com/x86/