Array of objects is not validated

[ursm]

When I have the following schema and parameters:

xs:
  type: array
  items:
    type: object
    properties:
      x:
        type: integer

{
  "xs": [
    {
      "y": 42
    }
  ]
}

(Note that the property of the element is y, not x.)

I was expecting to get an error when validating this parameter, but it actually passed.

If I make the parameter not an array of objects, I get an error as expected.

{
  "xs": 42
}

OpenAPIParser::ValidateError:
  #/paths/~1validate_test/post/requestBody/content/application~1json/schema/properties/xs expected array, but received Integer: 42

Is there something I am missing?

[ota42y]

All property is optional by default in OpenAPI 3 specification, so the parameter which doesn't include x is valid.
If the parameter must have x, please set required field

When there is a parameter other than the specified parameter ( i.e. the parameter must not have y), please set additionalProperties is false (default true)