bfs.js

const widget = {
    "debug": "on",
    "window": {
        "title": "Sample Konfabulator Widget",
        "name": "main_window",
        "width": 500,
        "height": 500
    },
    "image": {
        "src": "Images/Sun.png",
        "name": "sun1",
        "hOffset": 250,
        "vOffset": 250,
        "alignment": "center"
    },
    "text": {
        "data": "Click Here",
        "size": 36,
        "style": "bold",
        "name": "text1",
        "hOffset": 250,
        "vOffset": 100,
        "deeper": {"final": 400, "moredeeper": {"finally": 500}}, 
        "alignment": "center",
        "onMouseUp": "sun1.opacity = (sun1.opacity / 100) * 90;"
    }
}

/*
function numberValueArray(widget) {
  var arr = [];

  Object.keys(widget).forEach((k1) => {

    if ((typeof widget[k1] === 'object')) {

      Object.keys(widget[k1]).forEach((k2) => {

        if (typeof widget[k1][k2] === 'number') {
          //console.log(k2);
          arr.push(k2);
        }

      });

    };

  });
  return arr;

}
*/

function numberValueArray(widget) {
  var ret = [];
  for(key in widget) {

    if(typeof widget[key] === 'object') {

      for(key2 in widget[key]) {

        if(typeof widget[key][key2] === 'number') {
          ret.push(key2);
        }
      }
    }
  }
  return ret;
}

function recursiveSearch(widget) {
  var ret = [];
  var stack = [];
  var index = 0;
  //(key, value)
  //if value is an object
  //go deeper
  for(key in widget) {
    stack.push([key, widget[key]]);
  }

  while(index < stack.length) {
    if (typeof stack[index][1] === 'number') {
      ret.push(stack[index][0]);
    } else if (typeof stack[index][1] === 'object') {
      for (key in stack[index][1]) {
        stack.push([key, stack[index][1][key]]);
      }
    } else {

    }

    index++;
  }

  return ret;
}

console.log(typeof widget);
console.log(numberValueArray(widget));
console.log(recursiveSearch(widget));