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@liquid-js/qr-code-styling

v4.0.6

Published

Generate styled QR codes on web or in Node

Downloads

4,102

Readme

QR Code Styling

Version

JavaScript library for generating QR codes with customizable styling.

Try it here https://styled-qr.liquidjs.io/

Examples

Installation

npm install @liquid-js/qr-code-styling

API Documentation

https://liquid-js.github.io/qr-code-styling/

Usage

Browser

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>QR Code Styling</title>
  </head>
  <body>
    <div id="canvas"></div>
    <button type="button" id="dl">Download</button>
    <script type="module">
      import { QRCodeStyling, browserUtils } from "https://unpkg.com/@liquid-js/qr-code-styling/lib/qr-code-styling.js";

      const qrCode = new QRCodeStyling({
        data: "https://www.facebook.com/",
        image: "https://upload.wikimedia.org/wikipedia/commons/5/51/Facebook_f_logo_%282019%29.svg",
        dotsOptions: {
          color: "#4267b2",
          type: "rounded",
          size: 10
        },
        backgroundOptions: {
          color: "#e9ebee",
          margin: 1
        },
        imageOptions: {
          crossOrigin: "anonymous",
          margin: 1,
          imageSize: 0.5
        }
      });

      qrCode.append(document.getElementById("canvas"));

      document.getElementById("dl").addEventListener("click", () => {
        browserUtils.download(qrCode, { extension: "png" }, { width: 1200, height: 1200 });
      });
    </script>
  </body>
</html>

Node

⚠️ Note: make sure to install optional peer dependencies when running on Node (not needed for browser environments)

npm install @xmldom/xmldom file-type @liquid-js/qrcode-generator sharp
import { QRCodeStyling } from "@liquid-js/qr-code-styling";
import { writeFile } from "fs/promises";
import PDFDocument from "pdfkit";
import SVGtoPDF from "svg-to-pdfkit";

const qrCode = new QRCodeStyling({
  data: "https://www.facebook.com/",
  image: "https://upload.wikimedia.org/wikipedia/commons/5/51/Facebook_f_logo_%282019%29.svg",
  dotsOptions: {
    color: "#4267b2",
    type: "rounded",
    size: 10
  },
  backgroundOptions: {
    color: "#e9ebee",
    margin: 1
  },
  imageOptions: {
    crossOrigin: "anonymous",
    margin: 1,
    imageSize: 0.5
  }
});

const svgCode = await qrCode.serialize();

const { width, height } = qrCode.size;
const buffers = [];
const doc = new PDFDocument({ size: [width, height] });
doc.on("data", (v) => buffers.push(v));
const buffer = await new Promise((resolve) => {
  doc.on("end", () => {
    resolve(Buffer.concat(buffers));
  });
  SVGtoPDF(doc, svgCode, 0, 0, {
    width,
    height,
    assumePt: true
  });
  doc.end();
});
await writeFile("qr.pdf", buffer);

Kanji support

For Kanji mode to work, import stringToBytesFuncs from @liquid-js/qr-code-styling/kanji and inclue it with config.

import { stringToBytesFuncs } from "@liquid-js/qr-code-styling/kanji";

const qrCode = new QRCodeStyling({
  data: "漢字",
  qrOptions: {
    mode: Mode.kanji
  },
  stringToBytesFuncs
  // ...other options
});

License

MIT License