qr is a library for generating QR Codes in pure Go.

go get github.com/AlexEidt/qr

qrcode, err := qr.NewQRCode("QR Code", &qr.Options{Error: "H"})
if err != nil {
    panic(err)
}

qrcode.Render("qr.png", 10)

Below are the functions available for a QRCode.

qr.NewQRCode(data string, options *qr.Options) (*qr.QRCode, error)

Version() int
Mode() int // 1: numeric, 2: alphanumeric, 4: byte
ErrorLevel() string // L, M, Q, H
Bitmap() *qr.Bitmap
Render(filename string, scale int) error // .png, .jpg, .svg supported

When building a QR Code, certain parameters can be specified such as the Version, Mode and Error Correction Level.

type Options struct {
	Version int
	Mode    int
	Error   string
}

Currently, only Numeric, Alphanumeric and Binary modes are supported for data encoding.

• Kanji mode is not supported.
• Structured Append mode is not supported.
• Extended Channel Interpretations (ECI) mode is not supported.
• Model 1 QR Codes are not supported.

The following resources were helpful in building this library:

• The pyqrcode repository by mnooner256: https://github.com/mnooner256/pyqrcode
• The QR Code Tutorial at: http://www.thonky.com/qr-code-tutorial/
• The QR Code Tutorial at: https://www.matchadesign.com/news/blog/qr-code-demystified-part-1/