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JSON to Swift Model

Generate Swift Codable structs from JSON. Get camelCase properties, CodingKeys for odd keys, optionals, and nested structs automatically.

JSON input

Paste JSON, optionally name the root type, then generate.

Your Swift Codable struct code will appear here.
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Compiler generated parsing

Swift's Codable synthesis writes the encode and decode logic for you at compile time. This tool produces the struct declarations, so a sample API response becomes decodable models in seconds.

Naming conventions handled

JSON keys rarely follow Swift style. The generator converts keys to camelCase properties and emits a CodingKeys enum only where the mapping differs, keeping the output clean and idiomatic.

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JSON to Swift Model FAQs

What does Codable give me?
Conforming to Codable lets Swift's JSONDecoder turn JSON data into your struct with one decode call, and JSONEncoder does the reverse, with all mapping handled by the compiler.
What are CodingKeys for?
When a JSON key is not valid camelCase, like user_name, the property becomes userName plus a CodingKeys enum mapping it back, keeping Swift naming conventions intact.
How are missing fields handled?
Fields that are null or absent in some records become optionals (String?), so decoding succeeds even when the API omits them.
How are arrays typed?
JSON arrays become Swift arrays like [String] or [Project], which JSONDecoder fills element by element.
Can I use this in SwiftUI apps?
Yes. Codable structs are the standard model layer for SwiftUI apps fetching REST APIs, and they work with async URLSession calls directly.
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