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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.
We don't use grpc-web in our project, because Angular (our FE framework) is not yet officially supported (except https://github.com/ngx-grpc/ngx-grpc). Moreover, JSON over HTTP is still a standard.
The future of gRPC load balancing is proxy less using the xDS APIs of Envoy. More info here. But as of now, there is no straightforward solution since there are no xDS management servers supporting this unless you are on GKE where you can use Traffic Director. Istio has experimental support, and it is said that it works, but it might require some manual configuration. If Go is fine for you, you could also be using go-control-plane, but definitely, the ecosystem around gRPC and xDS does not seem to be mature enough.