<input placeholder="data"> 
<button>Generate QR!</button><br><br>
<img src>

var parametersJson = {
    "size": 250, // Size of Qr Code
    "backgroundColor": "38-38-38", // Background Color Of Qr Code (In RGB)
    "qrColor": "255-255-255", // Color of Qr Code (In RGB)
    "padding": 2, // Padding 
    "data": "dev.to"
};

var parameters;

var btn = document.querySelector("button");
var img = document.querySelector("img");
var input = document.querySelector("input");

btn.addEventListener("click", function(){
    parametersJson.data = input.value || "dev.to";
    parameters = `size=${parametersJson.size}&bgcolor=${parametersJson.backgroundColor}&color=${parametersJson.qrColor}&qzone=${parametersJson.padding}&data=${parametersJson.data}` // Stitch Together all Paramenters
    img.src = `https://api.qrserver.com/v1/create-qr-code/?${parameters}` // Set Image URL To Link
});