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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 the lambda web adapter[1], you shouldn't need to make any code changes for web projects, just some dockerfile changes which are only used if it is running as a lambda, so the same container image should still work on ecs or another cloud. [1]https://github.com/awslabs/aws-lambda-web-adapter
etc.
Not this:
https://aws.amazon.com/cdk/
The person you're replying to was confused because you said "APIs and SDK" which clearly refers to the former, but then this followup post is referring to the latter. You can do everything with the SDK. The CDK is implemented on top of the SDK.