var arrayToTree = require('array-to-tree');

var dataOne = [
  {
    id: 1,
    name: 'Portfolio',
    parent_id: undefined
  },
  {
    id: 2,
    name: 'Web Development',
    parent_id: 1
  },
  {
    id: 3,
    name: 'Recent Works',
    parent_id: 2
  },
  {
    id: 4,
    name: 'About Me',
    parent_id: undefined
  }
];

arrayToTree(dataOne);

/*
 * Output:
 *
 * Portfolio
 *   Web Development
 *     Recent Works
 * About Me
 */

var dataTwo = [
  {
    _id: 'ec654ec1-7f8f-11e3-ae96-b385f4bc450c',
    name: 'Portfolio',
    parent: null
  },
  {
    _id: 'ec666030-7f8f-11e3-ae96-0123456789ab',
    name: 'Web Development',
    parent: 'ec654ec1-7f8f-11e3-ae96-b385f4bc450c'
  },
  {
    _id: 'ec66fc70-7f8f-11e3-ae96-000000000000',
    name: 'Recent Works',
    parent: 'ec666030-7f8f-11e3-ae96-0123456789ab'
  },
  {
    _id: '32a4fbed-676d-47f9-a321-cb2f267e2918',
    name: 'About Me',
    parent: null
  }
];

arrayToTree(dataTwo, {
  parentProperty: 'parent',
  customID: '_id'
});

/*
 * Output:
 *
 * Portfolio
 *   Web Development
 *     Recent Works
 * About Me
 */