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I am fetching the images & its positions from JSON using foreach.... Is there any way i can improve code standard for performance & other things....

https://codepen.io/kidsdial/pen/EMQVqK

var target;

let jsonData = {
  "path" : " newyear collage\/",
  "info" : {
    "author" : "",
    "keywords" : "",
    "file" : "newyear collage",
    "date" : "sRGB",
    "title" : "",
    "description" : "Normal",
    "generator" : "Export Kit v1.2.8"
  },
  "name" : "newyear collage",
  "layers" : [
    {
      "x" : 0,
      "height" : 612,
      "layers" : [
        {
          "x" : 0,
          "color" : "0xFFFFFF",
          "height" : 612,
          "y" : 0,
          "width" : 612,
          "shapeType" : "rectangle",
          "type" : "shape",
          "name" : "bg_rectangle"
        },
        {
          "x" : 160,
          "height" : 296,
          "layers" : [
            {
              "x" : 0,
              "height" : 296,
              "src" : "ax0HVTs.png",
              "y" : 0,
              "width" : 429,
              "type" : "image",
              "name" : "mask_image_1"
            },
            {
              "radius" : "26 \/ 27",
              "color" : "0xACACAC",
              "x" : 188,
              "y" : 122,
              "height" : 53,
              "width" : 53,
              "shapeType" : "ellipse",
              "type" : "shape",
              "name" : "useradd_ellipse1"
            }
          ],
          "y" : 291,
          "width" : 429,
          "type" : "group",
          "name" : "user_image_1"
        },
        {
          "x" : 25,
          "height" : 324,
          "layers" : [
            {
              "x" : 0,
              "height" : 324,
              "src" : "hEM2kEP.png",
              "y" : 0,
              "width" : 471,
              "type" : "image",
              "name" : "mask_image_2"
            },
            {
              "radius" : "26 \/ 27",
              "color" : "0xACACAC",
              "x" : 209,
              "y" : 136,
              "height" : 53,
              "width" : 53,
              "shapeType" : "ellipse",
              "type" : "shape",
              "name" : "useradd_ellipse_2"
            }
          ],
          "y" : 22,
          "width" : 471,
          "type" : "group",
          "name" : "user_image_2"
        }
      ],
      "y" : 0,
      "width" : 612,
      "type" : "group",
      "name" : "newyearcollage08"
    }
  ]
};


$(document).ready(function() {

    // upload image onclick

    $('.container').click(function(e) {

        var res = e.target;
        target = res.id;
        console.log(target);
        if (e.target.getContext) {
		// click only inside Non Transparent part
            var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
            if (pixel[3] === 255) {
                setTimeout(() => {
                    $('#fileup').click();
                }, 20);
            }
        }

    });

    function getAllSrc(layers) {
        let arr = [];
        layers.forEach(layer => {
            if (layer.src) {
                arr.push({
                    src: layer.src,
                    x: layer.x,
                    y: layer.y
                });
            } else if (layer.layers) {
                let newArr = getAllSrc(layer.layers);
                if (newArr.length > 0) {
                    newArr.forEach(({
                        src,
                        x,
                        y
                    }) => {
                        arr.push({
                            src,
                            x: (layer.x + x),
                            y: (layer.y + y)
                        });
                    });
                }
            }
        });
        return arr;
    }

     function json(data)

        {
            var width = 0;
            var height = 0;

            let arr = getAllSrc(data.layers);

            let layer1 = data.layers;
            width = layer1[0].width;
            height = layer1[0].height;
            let counter = 0;
            let table = [];

            for (let {
                    src,
                    x,
                    y
                } of arr) {

                $(".container").css('width', width + "px").css('height', height + "px").addClass('temp');

                var mask = $(".container").mask({
                    maskImageUrl: 'https://i.imgur.com/' + src,
                    onMaskImageCreate: function(img) {

                        img.css({
                            "position": "absolute",
                            "left": x + "px",
                            "top": y + "px"
                        });

                    },
                    id: counter
                });
                table.push(mask);
                fileup.onchange = function() {

                    let mask2 = table[target];
                    mask2.loadImage(URL.createObjectURL(fileup.files[0]));
                    document.getElementById('fileup').value = "";
                };
                counter++;
            }

        }

json(jsonData);
}); // end of document ready

// jq plugin 

(function($) {
    var JQmasks = [];
    $.fn.mask = function(options) {
        // This is the easiest way to have default options.
        var settings = $.extend({
            // These are the defaults.
            maskImageUrl: undefined,
            imageUrl: undefined,
            scale: 1,
            id: new Date().getUTCMilliseconds().toString(),
            x: 0, // image start position
            y: 0, // image start position
            onMaskImageCreate: function(div) {},
        }, options);


        var container = $(this);

        let prevX = 0,
            prevY = 0,
            draggable = false,
            img,
            canvas,
            context,
            image,
            timeout,
            initImage = false,
            startX = settings.x,
            startY = settings.y,
            div;

        container.mousePosition = function(event) {
            return {
                x: event.pageX || event.offsetX,
                y: event.pageY || event.offsetY
            };
        }

        container.selected = function(ev) {
            var pos = container.mousePosition(ev);
            var item = $(".masked-img canvas").filter(function() {
                var offset = $(this).offset()
                var x = pos.x - offset.left;
                var y = pos.y - offset.top;
                var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
                return d[0] > 0
            });

            JQmasks.forEach(function(el) {
                var id = item.length > 0 ? $(item).attr("id") : "";
                if (el.id == id)
                    el.item.enable();
                else el.item.disable();
            });
        };

        container.enable = function() {
            draggable = true;
            $(canvas).attr("active", "true");
            div.css({
                "z-index": 2
            });
        }

        container.disable = function() {
            draggable = false;
            $(canvas).attr("active", "false");
            div.css({
                "z-index": 1
            });
        }

        container.onDragStart = function(evt) {
            if (evt.target.getContext) {
                var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;

                $(canvas).attr("active", "true");
                container.selected(evt);
                prevX = evt.clientX;
                prevY = evt.clientY;
                var img = new Image();
                evt.originalEvent.dataTransfer.setDragImage(img, 10, 10);
                evt.originalEvent.dataTransfer.setData('text/plain', 'anything');

            }
        };

        container.getImagePosition = function() {
            return {
                x: settings.x,
                y: settings.y,
                scale: settings.scale
            };
        };

        container.onDragOver = function(evt) {

            if (evt.target.getContext) {
                var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;
                if (pixel[3] === 255) {
                    if (draggable && $(canvas).attr("active") === "true") {
                        var x = settings.x + evt.clientX - prevX;
                        var y = settings.y + evt.clientY - prevY;
                        if (x == settings.x && y == settings.y)
                            return; // position has not changed
                        settings.x += evt.clientX - prevX;
                        settings.y += evt.clientY - prevY;
                        prevX = evt.clientX;
                        prevY = evt.clientY;
                        container.updateStyle();
                    }
                } else {
                    evt.stopPropagation();
                    return false;
                }
            }
        };

        container.updateStyle = function() {
            clearTimeout(timeout);
            timeout = setTimeout(function() {
                //context.clearRect(0, 0, canvas.width, canvas.height);
                context.beginPath();
                context.globalCompositeOperation = "source-over";
                image = new Image();
                image.setAttribute('crossOrigin', 'anonymous');
                image.src = settings.maskImageUrl;
                image.onload = function() {
                    canvas.width = image.width;
                    canvas.height = image.height;
                    context.drawImage(image, 0, 0, image.width, image.height);
                    div.css({
                        "width": image.width,
                        "height": image.height
                    });
                };

                img = new Image();
                img.src = settings.imageUrl;
                img.setAttribute('crossOrigin', 'anonymous');
                img.onload = function() {
                    settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
                    settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
                    context.globalCompositeOperation = 'source-atop';
                    context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
                    initImage = false;
                };
            }, 20);
        };

        // change the draggable image
        container.loadImage = function(imageUrl) {
            console.log("load");
            if (img)
                img.remove();
            // reset the code.
            settings.y = startY;
            settings.x = startX;
            prevX = prevY = 0;
            settings.imageUrl = imageUrl;
            initImage = true;
            container.updateStyle();
        };

        // change the masked Image
        container.loadMaskImage = function(imageUrl, from) {
            if (div)
                div.remove();
            canvas = document.createElement("canvas");
            context = canvas.getContext('2d');
            canvas.setAttribute("draggable", "true");
            canvas.setAttribute("id", settings.id);
            settings.maskImageUrl = imageUrl;
            div = $("<div/>", {
                "class": "masked-img"
            }).append(canvas);

            // div.find("canvas").on('touchstart mousedown', function(event)
            div.find("canvas").on('dragstart', function(event) {

                if (event.handled === false) return;
                event.handled = true;
                container.onDragStart(event);
            });

            div.find("canvas").on('touchend mouseup', function(event) {
                if (event.handled === false) return;
                event.handled = true;
                container.selected(event);
            });

            div.find("canvas").bind("dragover", container.onDragOver);
            container.append(div);
            if (settings.onMaskImageCreate)
                settings.onMaskImageCreate(div);
            container.loadImage(settings.imageUrl);
        };
        container.loadMaskImage(settings.maskImageUrl);
        JQmasks.push({
            item: container,
            id: settings.id
        })
        return container;
    };
}(jQuery));
.temp {}

.container {
	background: gold;
  position: relative;
 
}

.masked-img {
	overflow: hidden;	
	position: relative;
}
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

<input id="fileup" name="fileup" type="file" style="display:none" >

<div class="container">

</div>

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