At the moment, the only constraint we placed on the name property is that it must be an object. This is not specific enough. Because the value of each property is just another valid JSON Schema, we can define a more specific schema for the name property:

{
  "type": "object",
  "properties": {
    "bio": { "type": "string" },
    "summary": { "type": "string" },
    "name": {
      "type": "object",
      "properties": {
        "first": { "type": "string" },
        "last": { "type": "string" },
        "middle": { "type": "string" }
      },
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}

This JSON Schema satisfies every constraint we want to impose on our Create User request payload. However, it looks just like an arbitrary JSON object; someone looking at it won't immediately understand that it is a schema. Therefore, to make our intentions more clear, we should add a title, description, and some metadata to it.