var xml2js = require('xml2js');
var xml = "<config><test>Hello</test><data>SomeData</data></config>";
var extractedData = "";
var parser = new xml2js.Parser();
parser.parseString(xml, function(err,result){
//Extract the value from the data element
extractedData = result['config']['data'];
console.log(extractedData);
});
console.log("Note that you can't use value here if parseString is async; extractedData=", extractedData);