JSON to Swift Codable Generator

Why generate Codable structs from JSON?

Swift's Codable makes JSON decoding type-safe, but you still have to declare the structs. Writing them by hand for a nested API response is slow and easy to get wrong. Generating from a real payload gives you a correct set of Codable types you can decode immediately with JSONDecoder.

What gets generated

Objects become structs conforming to Codable; nested objects become their own structs. Strings map to String, whole numbers to Int, decimals to Double, booleans to Bool, and arrays to [T]. Property names are camelCased, and when a name differs from the JSON key a CodingKeys enum is emitted to map it.

• String, Int, Double, Bool, [T]
• Nested objects become nested Codable structs
• CodingKeys enum for keys that don't match property names
• import Foundation header included

Decoding with JSONDecoder

Paste the structs into your project and decode with try JSONDecoder().decode(Root.self, from: data). If your API uses snake_case keys, you can either keep the generated CodingKeys or set decoder.keyDecodingStrategy = .convertFromSnakeCase and drop them — both approaches work.

Review before shipping

Generated structs mirror one sample. Mark fields that may be absent as optional (T?), use Date with a dateDecodingStrategy for timestamps, and double-check numeric types — an id that arrives as a large integer may need Int64. Treat the output as a starting point you refine.