gistfile1.js

tv4 = require 'tv4'

result =
  data:
    items: [
      values: [
        A: "2014-02-01 00:00:00"
        B:
          "link clicks": 38993
          "other clicks": 37192
          "photo view": 5969
          "video play": 12
      ]
      aggregate:
        B:
          simple:
            avg: 190
            sum: 570
            min_abs: [["2014-02-01 00:00:00", 108]]
            max_abs: [["2014-04-01 00:00:00", 250]]

      id: "78569316"
      type: "tw-profile"
      timeFrom: "2014-02-01"
      timeTo: "2014-04-30"
    ]

schema =
  title: 'fbBenchmark-results'
  type: 'object'
  properties:
    data:
      type: 'object'
      required: yes
      properties:
        items:
          type: 'array'
          required: yes
          items: [
            type: 'object'
            properties:
              values:
                type: 'array'
                items: [
                ]
                additionalItems:
                  required: yes
                  type: 'object'
                  properties:
                    A:
                      type: 'string'
                      required: yes
                    B:
                      type: ['object', 'null']
                      required: yes
                      properties:
                        'link clicks':
                          type: 'number'
                        'other clicks':
                          type: 'number'
                      required: [
                        "link clicks"
                        "other clicks"
                        "photo view"
                        "video play"
                        ]
          ]

valid = tv4.validate result, schema
console.log tv4.error