This code will help us to convert XML files to JSON. Using this script snippet You can easily convert XML data to JSON format. This will apply in SOAP-based integration(XML based response converting to JSON)

require(['N/xml'], function (xmlMod) {
//This function refer to https://davidwalsh.name/convert-xml-json
function xmlToJson(xmlNode) {
// Create the return object
var obj = Object.create(null);

if (xmlNode.nodeType == xmlMod.NodeType.ELEMENT_NODE) { // element
// do attributes
if (xmlNode.hasAttributes()) {
obj['@attributes'] = Object.create(null);
for (var j in xmlNode.attributes) {
if(xmlNode.hasAttribute({name : j})){
obj['@attributes'][j] = xmlNode.getAttribute({
name : j
});
}
}
}
} else if (xmlNode.nodeType == xmlMod.NodeType.TEXT_NODE) { // text