Node.js addon(N-API) QR-code generator based on libqrencode in C - a fast and compact QR Code encoding library. qrencode_mini module is for node.js server side usage. Implements not all feaures like its original lib has. Produces a buffer as output. That can be encoded to base64 string and added to the image src attribute in a html murkup.
Micro QR feature is some way experimental at the moment.
libpng must be installed.
npm install qrencode_mini
There is only one method.
const {qrencode} = require('qrencode_mini');
const options = {
background_color:'#76eec6', // hex string, optional, default: black
foreground_color:'#ff0000', // hex string, optional, default: white
level:"q", // string, optional, default: "l", LOW,
//can be:"m", Medium
// "q", Quartile
// "h", High
dot_size: 6, // number, optional, default: 3
margin:2, // number, optional, default: 4
micro:0, // number, optional, default: 0
// if a string to be encoded to the microQR? 0 means "NO", 1 = "YES"
version:4 // number, optional, default: 0
// can be 0, 1, 2, 3, 4 //for microQR(if micro=1) must be equal to 3 or 4!!!!
}
let str="bitcoin:1BMXmqU3fZ8PVjPbxgeenEX93YYf74bjeB?amount50&label=John&message=Donation%20for%20project";
let buf=Buffer.from(str);
// a promise:
qrencode(buf, options).then(function(data){
console.log('data: ','data:image/png;base64,'+data.toString('base64'));
}).catch(function(err){console.log('err promise: ',err);
})
The version for microQR if micro = 1, must be specified to 3 or 4!
- QR encoded "mama"
- microQR encoded "mama"
- qrencode_mini is about x3 times faster than qr-node
- qrencode_mini is about x300 times faster than qrcode-js
| Iterations | 1 | 5 | 100 |
|---|---|---|---|
| qrencode_mini | 1.871ms | 5.181ms | 5.587ms |
| qr-node | 4.940ms | 41.030ms | 519.877ms |
| qrcode-js | 297.948ms | 1405.711ms | 9803.455ms |