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covid-certificate-scanner
Discontinued Web application that scans EU Digital Covid Certificates to extract and display all the information they enclose.
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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.
With it you can scan the QR code of any certificate emitted by the authorities of any participating country, and display all the information it contains. This can be useful if e.g. you don't want to install the official apps, or if they happen to display partial information only, or simply out of curiosity. No data whatsoever is sent out somewhere as everything is processed in your browser. But don't trust me and check out the source code :)
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