Inconsistent userId type in POST vs GET response

[Tania2607]

There is a type inconsistency in the userId field of the posts endpoint in JSONPlaceholder.

• When I send a GET request to /posts/1, userId is returned as an integer:
  Response:
  {
  "userId": 1,
  "id": 1,
  "title": "...",
  "body": "..."
  }

• But when I send a POST request to /posts with userId=1, userId is returned as a string:
  Response:
  {
  "body": "B",
  "title": "A",
  "userId": "1",
  "id": 101
  }

This inconsistency causes issues in typed languages like Swift or TypeScript where the model expects userId to be an Int.

Example Swift model that fails:
struct Post: Codable {
let id: Int?
let userId: Int
let title: String
let body: String
}

Suggested fix: Ensure the userId is always returned as an integer in all responses, including POST, to keep the API behavior consistent.

Thank you for the amazing tool!