Function that parses xml to json

xml2json.js

xmlToJson(xml) {
    // Create the return object
    let obj = {};
    let attribute;
    let item;

    if (xml.nodeType == 1) {
      // element
      // do attributes
      if (xml.attributes.length > 0) {
        obj['@attributes'] = {};
        for (let j = 0; j < xml.attributes.length; j += 1) {
          attribute = xml.attributes.item(j);
          obj['@attributes'][attribute.nodeName] = attribute.nodeValue;
        }
      }
    } else if (xml.nodeType === 3) {
      // text
      obj = xml.nodeValue;
    }

    // do children
    if (xml.hasChildNodes()) {
      for (let i = 0; i < xml.childNodes.length; i += 1) {
        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;
  }