{
    "$id": "https://example.com/schemas/nestedobject",
    "$schema": "http://json-schema.org/draft-07/schema",
    "title": "Nested Object",
    "type": "object",
    "properties": {
        "settings": {
            "description": "settings",
            "type": "object",
            "properties": {
                "collaborators": {
                    "description": "collaborators",
                    "type": "object",
                    "patternProperties": {
                        ".*": {
                            "type": "string"
                        }
                    },
                    "properties": {
                        "id": {
                            "type": "string"
                        }
                    }
                }
            }
        }
    },
    "additionalProperties": false
}