WASM QR code generator

This module generates QR codes and is based on https://github.com/skip2/go-qrcode.

Usage

Import initializer

First of all, include script ./wasm_exec.js to your webpage.

Load WASM

function loadWasm(pathToWasm) {
    const go = new Go()
    return new Promise((resolve, reject) => {
        WebAssembly.instantiateStreaming(fetch(pathToWasm), go.importObject)
            .then(result => {
                go.run(result.instance)
                resolve(result.instance)
            })
            .catch(error => {
                reject(error)
            })
    })
}

Use exported function

When loaded, this package adds function generateQrCode to window object. Just call it with a single parameter containing URL or text to be encoded. The function will return base64 encoded string with QR code.

await loadWasm('./build/go-qr-code-generator.wasm')
const base64QRCode = generateQrCode('https://ros-plata.ru')

Set src attribute

const image = document.querySelector('img#qr')
image.setAttribute('src', `data:image/png;base64,${base64QrCode}`)

Development

• git clone
• run go get
• do changes
• run GOOS=js GOARCH=wasm go build -o ./build/go-qr-code-generator.wasm See this article for details.