Javascript read json and create json object

Question

I am having a hard time finding an example how to read a simple .json file and I can read and create a JSON object. Here is my file named AllWeek.json

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [101.46260261535645, 3.0185554329110373]
      },
      "properties": {
        "_id": "AVSsYt-dJhbPevXZmtga",
        "area": "candar kuteri plang",
        "square_feet": 326
      }
   }


  ]
 }

I have tried this code but it gives me CORS error.

readTextFile("AllWeek.json", function(text) {
  var data = JSON.parse(text);
  console.log(data);
});

function readTextFile(file, callback) {
  var rawFile = new XMLHttpRequest();
  rawFile.overrideMimeType("application/json");
  rawFile.open("GET", file, true);
  rawFile.onreadystatechange = function() {
    if (rawFile.readyState === 4 && rawFile.status == "200") {
      callback(rawFile.responseText);
    }
  };
  rawFile.send(null);
}