Parameter is an array, the 'items' property must be defined

Description

The parameter in question is an array, but you have not defined the items property for it. Array parameters must have the items property defined.

For more details, see the OpenAPI Specification.

Example

The following is an example of how this issue could look in your API definition:

{
  "parameters": [
  {
    "name": "ids",
    "in": "query",
    "description": "IDs to filter by",
    "required": true,
    "type": "array"
  }
}

Remediation

Make sure that all array parameters have the items property defined.

{
  "parameters": [
  {
    "name": "ids",
    "in": "query",
    "description": "IDs to filter by",
    "required": true,
    "type": "array",
    "items": {
       "type": "integer",
       "format": "int32"
       ...
     }
  }
}