flattenObjectES5.js

    /**
     * Takes a nested object and flattens its to one level.   Function recursively calls itself until finished.
	 * //https://stackoverflow.com/questions/34513964/how-to-convert-this-nested-object-into-a-flat-object
     * @public
     * @param {Object} currentNode - Current node in the nested object to process
     * @param {object} flattenedObject - The new object containing the flattened values
     * @param {object} flattendKey - The current flattened key name. Example: key.key1.key2
     * @returns {Object} 
	 * @example var testObj = {
				"key1" : "test1",
				"key2": "test2",
				"key3": {
					"subKey1": true,
					"subKey2": false,
					},
					"key4": [
						"a","b","c"
						]
				}
				
				flattenObj(testObj);

				Output: "{
					"key1": "test1",
					"key2": "test2",
					"key3.subKey1": true,
					"key3.subKey2": false,
					"key4.0": "a",
					"key4.1": "b",
					"key4.2": "c"
					}

     */
function flattenObj(currentNode, flattenedObject, flattenedKey) {
  	flattenedObject = flattenedObject || {};
    for (var key in currentNode) {
        if (currentNode.hasOwnProperty(key)) {
            var newKey;
            if (flattenedKey === undefined) {
                newKey = key;
            } else {
                newKey = flattenedKey + '.' + key;
            }

            var value = currentNode[key];
            if (typeof value === "object") {
                flattenObj(value, flattenedObject, newKey);
            } else {
                flattenedObject[newKey] = value;
            }
        }
    }
  return flattenedObject;
}