Free JSON to Swift Struct Generator Online
Convert JSON data to Swift structs with Codable conformance automatically. Supports nested objects, arrays, and optional properties. Download .swift files instantly for free.
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What is JSON to Swift?
JSON to Swift is a free online tool that generates Swift struct or class definitions from JSON data. It automatically adds Codable conformance so your types work seamlessly with JSONDecoder and JSONEncoder. Perfect for iOS and macOS developers working with REST APIs or JSON configuration files.
How to Use JSON to Swift
- Paste your JSON data into the input area
- Set the root struct/class name
- Choose between struct or class output
- Click 'Convert' and copy or download the .swift file
JSON to Swift Features
- Automatic Codable (Encodable & Decodable) conformance
- Choose between struct and class output
- Nested objects generate separate types
- Arrays map to [T] with correct element types
- Optional properties typed as T? for null values
JSON to Swift FAQ
Why use Codable?
Codable (Encodable + Decodable) is Swift's built-in protocol for JSON serialization. It works with JSONDecoder/JSONEncoder without any third-party libraries.
Struct vs Class — which should I use?
Prefer structs for value semantics and thread safety. Use classes when you need reference semantics or inheritance.
Is my data secure?
Yes! All conversion happens in your browser. Your data is never sent to any server.