Progressive Web Application Development by Example

Generating QR codes

Modern ticketing solutions are more about barcodes and QR codes than the physical ticket. To create a life-like ticket application, I needed to create custom QR codes for each ticket. Again, a pair of node modules made this very straightforward: qr-encode (http://cryptocoinjs.com/modules/misc/qr-encode/) and ba64 (https://www.npmjs.com/package/ba64).

qr-encode converts strings into one of a variety of QR code options. The following code shows you how to use the qr method to generate dataURI:

    let dataURI = qr(id, { 
        type: 6, 
        size: 6, 
        level: 'Q' 
    }); 

The qr method returns a base64 encoded data buffer. You still need to convert this into a physical file. This is where ba64 helps. It converts the base64 encoded buffer into ...