XML to JSON

xmlToJson.js

function xmlToJson(xml) {
    let obj = {};

    if (xml.nodeType === 1) {
        if (xml.attributes.length > 0) {
        obj['@attributes'] = {};
            for (let j = 0; j < xml.attributes.length; j++) {
                const attribute = xml.attributes.item(j);
                obj['@attributes'][attribute.nodeName] = attribute.nodeValue;
            }
        }
    }

    if (xml.hasChildNodes()) {
        for(let i = 0; i < xml.childNodes.length; i++) {
            const item = xml.childNodes.item(i);
            const nodeName = item.nodeName;
            if (typeof(obj[nodeName]) === 'undefined') {
                obj[nodeName] = this.xmlToJson(item);
            } else {
                if (typeof(obj[nodeName].push) === 'undefined') {
                    const old = obj[nodeName];
                    obj[nodeName] = [];
                    obj[nodeName].push(old);
                }
                obj[nodeName].push(this.xmlToJson(item));
            }
        }
    }
    return obj;
}