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document-library-microservice.js
This is a document library microservice which converts AWS S3 into a--Doc repository as a Service
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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.
I also wouldn't recommend it, as there are a number of reliability and security concerns here, such as abusing your S3 bucket and costing you a lot. Preferably a better solution might be one that utilizes CloudFront and Lambda@Edge to serve a globally distributed service with first-class permissions. One example of this would be: https://github.com/Authress/document-library-microservice.js