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JSON to Swift Model

Generate Swift Codable models from JSON instantly. High-performance tool for iOS and macOS developers with support for CodingKeys. Safe browser-side processing.

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Complete JSON Conversion & Utility Tools

Below is a comprehensive list of JSON conversion and utility tools available on Tool Wizard Hub.

JSON → File & Data Formats

JSON → Programming Languages

JSON → Documents & Tables

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Advanced JSON Tools

About JSON to Swift Model

The Ultimate Guide to JSON to Swift Codable Generation

In the Apple ecosystem, JSON is the standard for network communication, but Swift requires strongly-typed Structs or Classes that conform to the Codable protocol. Manually mapping JSON keys to Swift properties is a tedious task that often leads to decoding errors. Our JSON to Swift Converter automates this workflow, generating clean, idiomatic Swift code with full support for Optional types, CodingKeys, and nested hierarchies.

Why Use a Swift Model Generator?

Swift is a type-safe language that emphasizes clarity and safety. Using an automated generator provides several critical advantages for iOS, macOS, and SwiftUI developers:

  • Codable Protocol: Generate structs that automatically conform to Decodable and Encodable, making JSON parsing a one-line operation.
  • Naming Conventions: Automatically convert snake_case JSON keys into Swift-standard camelCase properties using enum CodingKeys.
  • Type Safety: Intelligently map JSON strings, numbers, and booleans to String, Int, Double, and Bool.
  • Nested Structures: Recursively generate sub-structs for deeply nested JSON objects, maintaining a clean and modular codebase.

Swift 5.x & SwiftUI Ready

Our tool generates modern Swift code compatible with the latest Xcode versions, perfect for your SwiftUI @State models or Combine pipelines.

Intelligent Null Handling

Detects null or missing values in your JSON and automatically marks the corresponding Swift properties as Optionals (e.g., String?).

100% Browser-Side Privacy

Your API data is processed entirely within your local browser. No data is sent to our servers, ensuring your sensitive JSON endpoints remain private.

Technical Comparison: JSON vs. Swift Model

Feature JSON Structure Swift Codable Struct
Typing Dynamic Static / Strong
Key Naming Flexible camelCase (Standard)
Empty Values null Optional (T?)
Collections [ ] Array [T]

How to Implement the Output in Your iOS App

Once you have generated your Swift models, you can decode your data using JSONDecoder. Our tool generates the necessary CodingKeys if the JSON keys differ from your property names:

// Generated Model Usage
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase // Optional
let userProfile = try decoder.decode(UserProfile.self, from: jsonData)

Frequently Asked Questions

Does this tool support CodingKeys?

Yes. If your JSON uses snake_case, the tool will generate a private enum CodingKeys: String, CodingKey to map those keys to your Swift camelCase properties.

Are the generated models compatible with SwiftUI?

Absolutely. The generated structs are lightweight and perfect for use as Identifiable models in SwiftUI Lists or as state-driven data structures.

How does it handle nested JSON arrays?

Nested arrays are converted into Swift Arrays (e.g., [String] or [CustomStruct]), maintaining full type safety across your entire data tree.

Can I convert Swift models back to JSON?

Since the generated code conforms to Codable, you can use JSONEncoder to transform your Swift objects back into JSON strings effortlessly.