I built an open source tool to specifically work on this problem: https://convert.zamicol.com https://convert.zamicol.com We know only two open source JS proje

I built an open source tool to specifically work on this problem: https://convert.zamicol.com https://convert.zamicol.com We know only two open source JS projects that even support alphanumeric, Nayuki and Paul’s. https://github.com/Cyphrme/QRGenJS https://github.com/Cyphrme/QRGenJS. We have it hosted here: https://cyphr.me/qrgen https://cyphr.me/qrgen I’ve also done a lot of work on this problem: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/11580064 https://image-ppubs.uspto.gov/dirsearch-public/print/downloa... Also, regarding alphanumeric, RFC 3986 states that: > An implementation should accept uppercase letters as equivalent to lowercase in scheme names (e.g., allow “HTTP” as well as “http”)