Does not work with array as input

The code throws exception with following code. errorNotAnArray = "Your JSON must be an array or an object.",
It seems like problem due to missing testing. I have added required pull request to update it. 
The issue is for future user

```
[
  {
    "key": "Tim",
    "value": 0
  },
  {
    "key": "Monster",
    "value": 0
  },
  {
    "key": "Hunk",
    "value": 0
  }
]
```