array additionalProperties doesn't work

[hazendaniels]

This is my first attempt at writing a schema for JSON. Everything is fine as long as types are defined as objects. But if I change the type to an array the additionalProperties option no longer works.

Using https://www.jsonschemavalidator.net/ to validate while testing.

Any help would be appreciated

Successfully validates - Property 'X' has not been defined and the schema does not allow additional properties.
Schema

{
  "type": "object",
  "required": true,
  "additionalProperties": false,
  "properties": {
    "OrderItems": {
      "type": "object",
      "required": true,
      "additionalProperties": false,
      "properties": {
        "ProductID": {
          "type": "string",
          "required": true
        },
        "Quantity": {
          "type": "integer",
          "required": true
        }
      }
    }
  }
}

JSON

{
  "OrderItems": {
    "ProductID": "E0010",
    "Quantity": 1,
    "X": 0
  }
}

Unsuccessfully validates when OrderItems is changed to an arrary
Schema

{
  "type": "object",
  "required": true,
  "additionalProperties": false,
  "properties": {
    "OrderItems": {
      "type": "array",
      "required": true,
      "additionalProperties": false,
      "properties": {
        "ProductID": {
          "type": "string",
          "required": true
        },
        "Quantity": {
          "type": "integer",
          "required": true
        }
      }
    }
  }
}

JSON

{
  "OrderItems": [
    {
      "ProductID": "E0010",
      "Quantity": 1,
      "X": 0
    }
  ]
}

[hazendaniels]

I believe I have figured it out

{
  "type": "object",
  "required": true,
  "additionalProperties": false,
  "properties": {
    "OrderItems": {
      "type": "array",
      "required": true,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "ProductID": {
            "type": "string",
            "required": true
          },
          "Quantity": {
            "type": "integer",
            "required": true
          }
        }
      }
    }
  }
}

[gregsdennis]

What version of JSON Schema are you using? The way you're using required hasn't been correct since draft 3.

See https://json-schema.org/understanding-json-schema/reference/object#required for proper usage.