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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.
Thanks! Glad you like it. I'm the original author of Riot (https://riot.js.org/) so that's the style of frontend development I'm most comfortable with. We're using our own flavour of the library, which has the original super-mimimalistic feel on it.
We're using nats.io for event streaming and pub/sub. The sessions are aggregated in memory, then they go to Badger (https://github.com/dgraph-io/badger), and finally the daily aggregates are easily distributable and immutable JSON files.
We're setting a session identifier to sessionStorage and those id's are wiped out once the session is processed and leaves the server memory. We worked together with a privacy specialist to ensure this is not violating GDPR. Details on what/how we collect data is here:
https://volument.com/privacy/