JSON to Swift Converter - Generate Swift Structs

Struct Name:

Use Codable

Optional Types

JSON Input

Swift Output

What is JSON to Swift Converter?

Need to generate Swift structs and classes from your JSON (JavaScript Object Notation) data? This tool does that instantly. Perfect for Swift developers working with iOS, macOS, or server-side Swift who need to deserialize JSON into strongly-typed Swift objects. Generate structs, Codable conformance, and type definitions automatically.

According to Swift documentation, Codable protocol makes JSON encoding and decoding seamless. Our converter analyzes your JSON structure and generates proper Swift structs. First, validate your JSON using our JSON Validator, then convert it to Swift. You can also format your JSON with our JSON Formatter first if needed.

Everything happens in your browser – your JSON never leaves your computer. Convert, download, and use your Swift structs right away.

How to Use JSON to Swift

Follow these steps to convert JSON to Swift structs. Each step uses the actual buttons and panels on this page.

Paste, Upload, or Load Sample

Paste your JSON into the left JSON Input panel, or click Upload to load a .json or .txt file. Click Sample to see example JSON. Example input:

{"subscriberId":"SUB-1001","plan":"Unlimited 5G","dataUsage":45.2,"status":"active"}

Invalid JSON will show an error. Use our JSON Validator first if unsure. Configure struct name, Codable, and optional types in the options above.

View Generated Swift Output

The right Swift Output panel shows the generated Swift code instantly. JSON objects become structs, arrays become arrays.

Download or Copy

Click Download to save the Swift file, or Copy to copy to your clipboard. Use Clear on the input panel to start over. All processing runs in your browser.

When You'd Actually Use This

iOS Development

Generate Swift structs from JSON API responses for iOS apps. Create models for REST APIs or JSON-based configurations. Perfect for SwiftUI or UIKit applications.

macOS Development

Create Swift structs from JSON data for macOS apps. Generate data models for JSON-based APIs or configurations. Perfect for macOS application development.

Server-Side Swift

Generate Swift structs from JSON data for server-side Swift applications. Create data models for JSON-based APIs or configurations. Perfect for Vapor or Kitura frameworks.

Code Generation

Generate Swift code from JSON data structures. Perfect for creating data models, DTOs, or entity structs from JSON schemas or API responses.

Common Questions

Is my JSON data stored?

Nope. Everything happens right in your browser. Your JSON never leaves your computer – we don't even see it. Check out the ECMA-404 standard for more details.

How are JSON objects handled?

JSON objects become Swift structs. Properties become struct properties, and nested objects become nested structs or references. Arrays become Swift arrays. Check out the RFC 8259 for more details.

Can I use the generated Swift code?

Yes. The generated Swift code is valid and ready to use. Drop it into your Swift project and start using it. You may want to review and refine the structs for your specific use case.

What about Codable?

You can enable Codable in the configuration options. This generates Swift structs with Codable conformance for seamless JSON encoding and decoding.

Does it work with large JSON files?

Yep. Since everything happens in your browser, it depends on your device. Small to medium JSON structures convert instantly. Really huge structures might take a few seconds.

What Swift version is supported?

The generated code works with Swift 4.0 and later. It uses standard Swift features and Codable protocol for maximum compatibility.

Other JSON Tools You Might Need

Conversion is just one JSON task. Here are other tools that work well together: