JSON to Swift Converter
Convert JSON to Swift Codable structs with nested types, optional properties, CodingKeys, and configurable naming directly in your browser.
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What is JSON to Swift Converter?
JSON to Swift Converter is a browser-based developer tool that turns JSON samples into Swift structs for iOS, macOS, and Swift server projects.
Key Benefits
- Generate nested Swift models without writing repetitive boilerplate.
- Represent optional API fields with Swift optional types.
- Add Codable conformance and CodingKeys for reliable JSON decoding.
- Keep API samples private because processing happens locally.
Common Use Cases
- •Create Swift models from REST API response examples.
- •Prototype iOS or macOS Codable structs.
- •Prepare DTOs for Swift networking and persistence projects.
- •Convert fixture JSON into readable Swift test models.
How to Convert JSON to Swift Models
- Paste JSON: Paste a valid JSON object or array into the JSON Input panel.
- Choose options: Set the root type name and choose Codable, optional properties, or camelCase fields.
- Generate Swift: Click Generate Swift to infer types and create nested structs.
- Copy or download: Review the generated code, then copy it or download the Swift file.
Key Features
- Infer Swift String, Bool, Int, Double, array, and nested object types.
- Generate readable structs with optional properties and safe Swift names.
- Add Codable conformance and CodingKeys for renamed JSON fields.
- Preserve nested models and arrays from representative JSON samples.
- Copy the generated code or download it as a .swift file.
Frequently Asked Questions
What does the JSON to Swift converter generate?
It generates Swift structs from JSON objects and arrays, including nested types, arrays, optional properties, Codable conformance, and CodingKeys when needed.
Can it create optional Swift properties?
Yes. Enable Make properties optional to add optional markers to generated property types.
Does it preserve the original JSON field names?
Yes. When camelCase changes a field name, the generator adds a CodingKeys enum so Codable still maps the original JSON key.
Is my JSON uploaded anywhere?
No. Parsing and code generation run entirely in your browser, so your JSON stays on your device.