ExportJSON.js

function exportJSON(layer, file_path){

  //initialize the layer array
  var layerArray = [];

  //create the variables
  var layerName = String(layer.name());
  var layerFrame = layer.absoluteRect();
  var layerXpos = String(layerFrame.x());
  var layerYpos = String(layerFrame.y());
  var layerHeight = String(layerFrame.height());
  var layerWidth = String(layerFrame.width());

  // add the strings to the array
  layerArray.push({
      name: layerName,
      xPos: layerXpos,
      yPos: layerYpos,
      height: layerHeight,
      width: layerWidth,
  });
  
  // Create the JSON object from the layer array
  var jsonObj = { "layer": layerArray };
  // Convert the object to a json string
  var file = NSString.stringWithString(JSON.stringify(jsonObj, null, "\t"));
  // Save the file
  [file writeToFile:file_path+layerName+".json" atomically:true encoding:NSUTF8StringEncoding error:null];

  var alertMessage = layerName+".json saved to: " + file_path;
  alert("Layer JSON Exported!", alertMessage);

}