{ "type": "object", "required": [ "id", "title", "description", "state", "iid", "created_at",
"due_date"
], "properties": { "id": { "type": "integer" }, "title": { "type": "string" },
"description": { "type": ["string", "null"] },
"state": { "type": "string" }, "iid": { "type": "integer" }, "created_at": { "type": "date" },
"due_date": { "type": ["date", "null"] }
}, "additionalProperties": false }