JSON to Swift Codable Struct Generator
Instantly convert JSON objects into idiomatic Swift 5.9+ Codable models. Generates clean type inference, CodingKeys enums for snake_case keys, Identifiable protocols, and decoding unit tests.
Building Robust iOS Data Models with Swift Codable
Introduced in Swift 4 and refined through modern Swift 5.9 and Swift 6 concurrency, the Codable protocol system simplifies network serialization between REST APIs and iOS applications. Instead of writing brittle manual dictionary parsing code with JSONSerialization, Codable generates compile-time type-safe deserialization logic.
1. Managing snake_case with CodingKeys
Most modern backends (Python Django, Ruby on Rails, Go) format JSON payload keys using snake_case, whereas Apple's official API Design Guidelines require Swift properties to use camelCase. Generating an explicit CodingKeys: String, CodingKey enum maps each Swift field to its exact remote JSON counterpart without changing your local Swift style.
2. SwiftUI and the Identifiable Protocol
When binding arrays of models into SwiftUI lists (List(users) { user in ... }), conforming your struct to Identifiable allows SwiftUI to uniquely track items without requiring explicit id: \.id parameters.
Frequently Asked Questions
user_first_name), this generator transforms them into camelCase (userFirstName) and writes explicit CodingKeys enum mappings, or you can leverage decoder.keyDecodingStrategy = .convertFromSnakeCase.