JSON to Swift
Convert JSON objects to Swift type definitions, interfaces, or classes automatically.
About JSON to Swift
Generate Swift Codable structs from JSON for iOS/macOS development. Creates structs conforming to Codable (both Encodable and Decodable) with optional CodingKeys enum for field name mapping. This is the standard approach for JSON handling in Swift — the JSONDecoder and JSONEncoder classes use Codable conformance automatically.
FAQ
How are null values handled?
Null values in JSON are mapped to nullable/optional types in the target language. In TypeScript: field: Type | null. In Go: *Type (pointer). In Python: Optional[Type]. In Java: Optional or @Nullable annotation. If a field is null in your sample JSON, consider providing a more complete sample where the field has a real value so the type can be accurately inferred.