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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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.
https://openpgpjs.org/
A number of Chrome (and I think also Firefox) extensions include their own local copy of OoenPGP.js for use with various webmail services, including GMail.
WKD (and HKP) depends upon HTTPS without cert pinning, FWIU: https://wiki.gnupg.org/WKD
How does an email client use WKD?
"PROPOSAL: Add support for general (hardware backed) cryptographic signatures and key exchange #263" https://github.com/w3c/webcrypto/issues/263
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