GenSON

GenSON is a Swift library that enables you to easily generate representative JSON data from any Swift type that conforms to Decodable. It can be used for:

• Mocking API responses
• Writing Socialised unit tests
• Auto-generating sample data for UI/Snapshot testing
• Debugging Codable models

• ✅ Automatically generates JSON from any Decodable type
• ✅ Supports nested models, optionals, arrays, dictionaries, etc.
• ✅ Configurable generated JSON values
• ✅ Zero setup required

Add the following to your Package.swift file:

dependencies: [
    .package(url: "https://github.com/ademanuele/GenSON.git", from: "0.0.1")
]

Then import it in your code:

import GenSON

Generate JSON for a Type

struct User: Decodable {
    let id: String
    let name: String
    let isActive: Bool
}

let json: String = try User.generate()
print(json)

Output:

{
  "id" : "1uTih9ZU1yJcIEFsVFHSoYelf32NPHssVR8eqLUGk",
  "isActive" : true,
  "name" : "qiMkyHIthSfxkdx2TbICDVq5KuxvBavZwkqrYpbXUXTIxIOlGXTrIyiZgpraF"
}

Optionally provide JSON generation options

let json: String = try User.generate(options: .init(stringLength: 3...5))
print(json)

Output:

{
  "id" : "yhGf",
  "isActive" : true,
  "name" : "Ldc"
}

Generating values from a given enum type is really difficult in Swift it seems. For this library to generate correct values for your Decodable enums they must:

• Have no associated types
• Inherit from a type that is Decodable, such as String or Int
• Conform to the CaseIterable protocol

GenSON works by passing the given Decodable model through a custom Foundation Decoder which navigates the object structure and generates dummy values for every property of the model.

• Decoding of enum types is not supported yet.
• Providing your own values for a given object property is not supported yet.

Contributions are very welcome!

• Fork the repo
• Create a new branch (git checkout -b feature/my-feature)
• Make your changes and commit (git commit -am 'Add new feature')
• Push to GitHub (git push origin feature/my-feature)
• Submit a Pull Request 🎉

Made with ❤️ in Swift.