How to Convert Copied JSON to Swift Codable on Mac

API documentation and debugging tools often give you sample JSON before you have a model. Rebuilding that structure by hand is tedious, especially when the payload contains nested objects or arrays.

Pasteon can recognize copied JSON and generate a Swift Codable model locally on your Mac.

Convert JSON from the clipboard

1. Copy a valid JSON object or array.
2. Open the item in Pasteon.
3. Choose Generate Data Model.
4. Select Swift Codable.
5. Paste the generated code into Xcode.

For example, this input:

{
  "user_id": 42,
  "display_name": "Jane",
  "is_active": true
}

becomes a typed starting point:

struct Root: Codable {
    let userId: Int
    let displayName: String
    let isActive: Bool
}

The generated model is intended as a useful starting point. Review property optionality, naming, nested type names, date handling, and API-specific edge cases before shipping it.

Keep API samples local

Pasteon's bundled JSON conversion runs locally. You do not need to paste copied API data into a separate online converter. This is especially useful when sample payloads contain internal identifiers or development data that should stay on your Mac.

Generate models for other stacks

The same action can generate TypeScript interfaces, Kotlin models, Go structs, and Python models. That makes the clipboard useful when the same API sample needs to move between an iOS client, web app, backend service, or test fixture.

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