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klaro-js
Klaro Privacy Manager. An open-source, privacy-friendly & compliant consent manager for your website.
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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 can use klaro to require consent. To use it, you modify your scripts so they don't load until consent is given for each particular service. Once consent is given for a specific service, klaro updates all scripts belonging to that service (determined by data attributes) so they can be loaded again. This is the only workflow that's completely 'safe' since simply loading the GA script requires consent under GDPR.