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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.
io-ts is written by Giulio Canti and offers runtime type validations. For more information on io-ts consult the README. The terminology we will use is to encode/decode is codecs, so called runtime representations of specific static types and these codecs can then be composed to build even larger type validations.
There are more improvements we could make, but we should have a basic understanding of why it might be useful to validate any external data at runtime. io-ts offers more features handling recursive and optional types. Furthermore there are libraries like io-ts-promise that provide more features and useful helpers, the above decodePromise, for example, is available in a more advanced variant via io-ts-promise.