Passing a JSON string from the JSX back to the panel

panels201_4.js

// JS file (panel)
// ...
csInterface.evalScript('getDocumentInfo()', function(res) {
  var resObj = JSON.parse(res);
  // you have now access to the same docInfo object
});

// JSX file (Photoshop)
function getDocumentInfo() {
  //... I just make up data here...
  var docInfo = {
    numberOfLayers : 4,
    layerNames : ['Background', 'Curves 1', 'Retouch', 'Curves 2'],
    colors : {
      background : '#828282',
      foreground : '#7d2555'
    }
  }
  return JSON.stringify(docInfo);
}