تحويل JSON إلى Swift Codable.

Types are inferred from the sample only. Everything is calculated in your browser; nothing you type is uploaded.

Integers map to Int, decimals to Double, arrays to [T]; optional or null fields become optionals. A small JSONValue enum is added when a field’s type varies.

user_name becomes let userName: String with case userName = "user_name" in CodingKeys.