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JSON 转 Swift Codable.
把 JSON 示例转换为 Swift Codable 结构体，为 snake_case 键生成 CodingKeys，支持可选值和嵌套类型。
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使用方法: JSON 转 Swift Codable
输入数据或选择文件，调整设置并生成结果。复制或下载之前，请检查结果。
限制与支持格式
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英语技术说明
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.