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aws-serverless-koa
This library enables you to utilize AWS Lambda and Amazon API Gateway to respond to web and API requests using the Koa.js application framework
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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.
Koa has a Lambda handler package (https://github.com/compwright/aws-serverless-koa), and so you should be able to serve anything that plugs into Koa as a middleware (i.e. apollo-server-koa) through your function handler instead. As for your other question about reasonability, I don't have much to offer without knowing your reasoning behind the stack in the first place as opposed to other potential managed database-GraphQL-combo options like Dgraph (Slash GraphQL) or Hasura Cloud or FaunaDB. If the resolver logic you need can't be handled by one of those services, I might wonder whether a Lambda GraphQL endpoint is the best fit in the first place, but your context could render that concern moot.
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