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JsBarcode
Barcode generation library written in JavaScript that works in both the browser and on Node.js
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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.
IMO QR and bar codes are so simple you might want to consider a client-side library instead. Save some money and unnecessary dependency on a 3rd party service. I've had pretty good experience with JsBarcode for JS and python-barcode for Python...
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.