parseTree.js

const postObj = {};
function parseTree(root) {
  for (const child in root) {
    const choice = values[child];
    if (!isEmpty(choice.value)) {
      // push the value in post object
      postObj[choice.name] = choice.value;
    }
    if (root[child]) {
      // call parse tree with the child
      parseTree(root[child][choice.value]);
    }
  }
}