How to import Mongoose to use json.parse()?

Question

I really want to use this code to import json file to javascript

var treeData;
var oReq = new XMLHttpRequest();
oReq.onload = reqListener;
oReq.open("get", "test.json", true);
oReq.send();
function reqListener(e) {
    treeData = JSON.parse(this.responseText);
}

But i can't use JSON.parse for some reason

Someone told me I have to import Mongoose web server too set my local folder in javascript

please teach me how to import it thanks

Answer 1

If you can import jquery, you can do $.parseJSON(this.responseText);