domparser.js

var node = document.documentElement

function callnode(node) {
    var result = {
            tag: node.nodeName
        },
        nodes, i;
    if (node.childElementCount) {
        result.children = [];
        for (i = 0; nodes = node.children[i]; i++) {
            for (k = 0; k < node.childNodes.length; k++) {
                if (node.childNodes[k].nodeType === 3 || node.childNodes[k].nodeType === 8) {
                    result[node.childNodes[k].nodeValue] = node.childNodes[k].nodeValue
                }
            }
            result.children.push(callnode(nodes));
        }

    }
    for (k = 0; k < node.childNodes.length; k++) {
        if (node.childNodes[k].nodeType === 3 || node.childNodes[k].nodeType === 8) {
            result[node.childNodes[k].nodeValue] = node.childNodes[k].nodeValue
        }
    }

    for (i = 0; nodes = node.attributes[i]; i++) {
        result[nodes.nodeName] = nodes.nodeValue;
    }
    return result;
}
tagresult = callnode(node)
console.log(tagresult)
jsonstring = JSON.stringify(tagresult)