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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.
A number of requests were made to expand the subset of JSON Schema that the OpenAPI spec allows to include more complex features of JSON Schema. In the 2.0 spec process, the potential tooling complexities around code generation prompted the exclusion of anyOf and oneOf. However, many users have requested relaxing that constraint, even though it would compromise tooling support for those features. This is one of the great challenges in spec design, and it is never easy when making choices like this to know whether it is better to give people sharp tools that they could cut themselves with, or to rely on experience to say no, the burden of this responsibility is too great. While OpenAPI 2.0 took the more conservative approach, the user base has grown more experienced, so some of the restrictions are being lifted, and users will have to make smart choices.