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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.
Yeah, you'd think so, wouldn't you. Unfortunately, two factors conspire to make that impossible. Firstly, the QR code for the vaccine card is based upon the Smart Health Card standard, which does it's best to generate the smallest payload possible, but it still ends up being ~1.7KB, which is on the large side for a QR code. Secondly, Apple always applies the "medium" error correction level to QR codes on a pass, and only displays them at a fixed size. Both of these combine to make a QR code on the pass that is too small and too dense to be scanned properly (at least by a smartphone when both devices are handheld). More details in this GitHub issue for another service that is trying to achieve this.