@sec-ant/barcode-detector

@sec-ant/barcode-detector

A Barcode Detection API polyfill that uses ZXing webassembly under the hood.

Install

npm i @sec-ant/barcode-detector

Usage

// import as side effects
import "@sec-ant/barcode-detector";
// or import explicitly
// import { BarcodeDetector } from "@sec-ant/barcode-detector";

const barcodeDetector: BarcodeDetector = new BarcodeDetector({
  formats: ["qr_code"],
});

const imageFile = await fetch(
  "https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=Hello%20world!"
).then((resp) => resp.blob());

const imageData = await createImageBitmap(imageFile).then((imageBitmap) => {
  const { width, height } = imageBitmap;
  const context = new OffscreenCanvas(width, height).getContext(
    "2d"
  ) as OffscreenCanvasRenderingContext2D;
  context.drawImage(imageBitmap, 0, 0, width, height);
  return context.getImageData(0, 0, width, height);
});

barcodeDetector.detect(imageData).then(console.log);