JSON to Language Struct / Class Generator
About JSON → Swift Struct
The JSON to Swift Struct & `Codable` Model Generator transforms JSON responses into type-safe Swift structs conforming to `Codable`, `Identifiable`, and `Sendable` with `CodingKeys` enum mappings for iOS, macOS, and visionOS apps.
How to Use JSON → Swift Struct
Step 1
Paste your JSON data into the editor.
Step 2
Configure protocol conformances (Identifiable, Sendable, Hashable).
Step 3
Enter struct name (e.g. `UserResponse`).
Step 4
Click "Copy Swift Struct".
Practical Use Cases for JSON → Swift Struct
iOS & macOS SwiftUI REST API Data Modeling
Convert JSON backend endpoints into Swift `Decodable` structs for `URLSession` and Alamofire networking layers.
Generating `CodingKeys` for snake_case JSON
Map snake_case API keys to idiomatic Swift camelCase property names using automatically generated `enum CodingKeys: String, CodingKey`.
Input & Output Examples
Converting JSON to Swift Codable Struct
`{ "user_id": 99, "display_name": "Sarah", "is_verified": true }``struct User: Codable, Identifiable {\n let id: Int\n let displayName: String\n let isVerified: bool\n enum CodingKeys: String, CodingKey {\n case id = "user_id"\n case displayName = "display_name"\n case isVerified = "is_verified"\n }\n}`Key Features & Performance
- ✓Conforms structs to `Codable` (`Encodable` & `Decodable`), `Identifiable`, `Hashable`, and Swift 6 `Sendable`.
- ✓Auto-generates `CodingKeys` enum to bridge snake_case API keys with Swift camelCase names.
- ✓Supports optional properties (`String?`) for nullable JSON values.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy Swift code.
Key Terminology & Definitions
`Codable` Protocol (Swift)
A type alias for `Encodable & Decodable` protocols enabling automated serialization between Swift data types and external representations like JSON.
`CodingKeys` Enum
A special Swift enum conforming to `CodingKey` used to customize property-to-JSON key mappings during encoding and decoding.