This library has been written to generate a SVG image of QR Code in Node.js, goals:
- pure JavaScript
- no browser requirement
- no external dependencies
- generate SVG output
Install the package:
npm install qrcode-svgInline example:
var QRCode = require("qrcode-svg");
var svg = new QRCode("Hello World!").svg();More options:
var qrcode = new QRCode({
content: "http://github.com/",
padding: 4,
width: 256,
height: 256,
color: "#000000",
background: "#ffffff",
ecl: "M"
});
qrcode.save("sample.svg", function(error) {
if (error) throw error;
console.log("Done!");
});List of options:
- content - QR Code content, required
- padding - white space padding,
4modules by default,0for no border - size - QR Code width and height in pixels
- color - color of modules, color name or hex string, e.g.
#000000 - background - color of background, color name or hex string, e.g.
white - ecl - error correction level:
L,M,H,Q
<?xml version="1.0" standalone="yes"?>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="256" height="256">
<rect x="0" y="0" width="256" height="256" style="fill:#ffffff;shape-rendering:crispEdges;"/>
<rect x="16" y="16" width="8" height="8" style="fill:#000000;shape-rendering:crispEdges;"/>
<rect x="24" y="16" width="8" height="8" style="fill:#000000;shape-rendering:crispEdges;"/>
<rect x="32" y="16" width="8" height="8" style="fill:#000000;shape-rendering:crispEdges;"/>
...
</svg>Using html-pdf to convert SVG to PDF (or PNG or JPEG)
var QRCode = require('qrcode-svg');
var svg = new QRCode('hello').svg();
...
var pdf = require('html-pdf');
pdf.create(svg, { border: 0, type: 'pdf' }).toFile('output.pdf', function(err, res) {
...
});QR Code in ASCII to output in a shell
var QRCode = require('qrcode-svg');
var hello = new QRCode("Hello World!");
var modules = hello.qrcode.modules;
var ascii = '';
var length = modules.length;
for (var y = 0; y < length; y++) {
for (var x = 0; x < length; x++) {
var module = modules[x][y];
ascii += (module ? 'x' : ' ');
}
ascii += '\r\n';
}
console.log(ascii);
xxxxxxx xx x x xxxxxxx
x x xxxx x x x x
x xxx x xx xx x x xxx x
x xxx x xx x xxx x
x xxx x x x x x xxx x
x x x xx xx x x
xxxxxxx x x x x x xxxxxxx
xx xx
x x xx x x xx x x
x x xx x xx x xx x
x x xx x x x xx xx
x xx xxx xx x x x x x
xx xxxx xxxx x
x x x xx x xx xx x xx xx
x xx xxxx xxxx
xx xx x x x x xx x
xxxx xxxx xxxxxx x
x x x
xxxxxxx x xxx x x x x
x x xxx x xx x x
x xxx x xxxxxxxxxx
x xxx x xxxxxxxxx x xx
x xxx x xxx xx x x x
x x x x x
xxxxxxx xxx xxx x x x
Use on a HTML page with JavaScript
<!DOCTYPE html>
<html>
<body>
<div id="container"></div>
<script src="lib/qrcode.js"></script>
<script>
var qrcode = new QRCode("Hello World!");
var svg = qrcode.svg();
document.getElementById("container").innerHTML = svg;
</script>
</body>
</html>Thanks to davidshimjs for the base library.
Thanks to Kazuhiko Arase for the original QR Code in JavaScript algorithm.
Licensed under the MIT license:
http://www.opensource.org/licenses/mit-license.php
The word "QR Code" is registered trademark of DENSO WAVE INCORPORATED
http://www.denso-wave.com/qrcode/faqpatent-e.html