{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "backgroundColor": {
      "type": "number",
      "default": 42
    },
    "something": {
      "type": "object",
      "required": [],
      "properties": {},
      "additionalProperties": false
    }
  },
  "required": [
    "backgroundColor"
  ]
}