Writing to JSON file

The following code cretes the json file on the desktop but fails to wrtie the obj variable values.

Any ideas why the code wrtitting functionality is not working?

#target photoshop

function createJSONFile(object){

  //defie file 
  var jsonFile = new File("~/Desktop/Test.json")
  //jsonFile.close();

  if(!jsonFile.exists) {
    //open file
    jsonFile.open("w")
    
    //write to file convert to string
    jsonFile.write(JSON.stringify(object));

    //close file
    jsonFile.close()
  }

}

//object variable
var obj={
  compName: "My comp",
  width: 1920,
  height: 1080,
  numLayer: 3
};

createJSONFile(obj);