Traverse through a tree of json - https://www.quora.com/How-do-you-loop-through-a-complex-JSON-tree-of-objects-and-arrays-in-JavaScript

traverse.js

function traverse(x, level) {
  if (isArray(x)) {
    traverseArray(x, level);
  } else if ((typeof x === 'object') && (x !== null)) {
    traverseObject(x, level);
  } else {
    console.log(level + x);
  }
}

function isArray(o) {
  return Object.prototype.toString.call(o) === '[object Array]';
}

function traverseArray(arr, level) {
  console.log(level + "<array>");
  arr.forEach(function(x) {
    traverse(x, level + "  ");
  });
}

function traverseObject(obj, level) {
  console.log(level + "<object>");
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      console.log(level + "  " + key + ":");
      traverse(obj[key], level + "    ");
    }
  }
}