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.
surveyjs.io
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Prebid.js
Setup and manage header bidding advertising partners without writing code or confusing line items. Prebid.js is open source and free.
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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.
You want ECH, ESNI was superceded.
There's a partial implementation in the open-source prebid project: https://github.com/prebid/Prebid.js/commit/2288ea47b32650a0943387f243385409e050158f
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