Free online JSON to Swift converter. Paste JSON and generate Swift struct definitions with Codable conformance, type annotations, and nested structure support automatically. 100% browser-based with zero uploads.
100% browser-based — your data never leaves your device
Convert JSON to Swift Codable structs instantly. Generate type-safe Swift structs with Codable conformance from JSON samples.
Copy your JSON data and paste it into the input textarea above.
Toggle nullable detection for optional property generation.
Click Generate, then copy the Swift structs or download the .swift file.
Drop a file here or click to browse
Ctrl+Enter to generate
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JSON to Swift is a free online json tool that convert json to swift codable structs instantly. generate type-safe swift structs with codable conformance from json samples. It works entirely in your browser — no downloads, no installations, and no server uploads required. backend developers, frontend engineers, DevOps engineers use JSON to Swift when they need a fast, privacy-respecting way to process json data without installing additional software. It supports capabilities such as codable generation, type inference, nested structs. Additional features include local processing. Common use cases include generating swift model structs from api response json for ios/macos development, creating codable-compatible types from sample configuration files and data structures, rapid prototyping of swift data models from mock json data. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes JSON to Swift ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
JSON to Swift Struct Generator is a free online json tool that helps you convert json to swift codable structs instantly. generate type-safe swift structs with codable conformance from json samples. Key capabilities include codable generation, type inference, nested structs. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to generating swift model structs from api response json for ios/macos development.
Copy your JSON data and paste it into the input textarea above.
Toggle nullable detection for optional property generation.
Click Generate, then copy the Swift structs or download the .swift file.
| Category | Details |
|---|---|
| Input Limits | Maximum file size: Browser memory bound (~2 GB) |
| Nesting depth: Unlimited (browser stack limit) | |
| Supported Formats | JSON, JSONC (with comments), JSON5 (extended syntax) |
| Browser Engine |
|
All operations run entirely in your browser using built-in JSON APIs. No server uploads, no data storage, and no third-party requests.
JSON to Swift is ideal when you need to generating swift model structs from api response json for ios/macos development without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for persistent editing environments with linting, consider using VS Code with JSON extension. For for server-side JSON processing in scripts, jq (command-line) may be a better fit. JSON to Swift fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. JSON to Swift processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
The generator targets Swift 5.0+ with Codable protocol support. The generated code uses standard Foundation Codable conformance with let properties.
Fields with null values are marked as optional with ? (e.g., String?). Fields with consistent non-null values are marked as non-optional.
Creates Swift structs with Codable conformance, making them ready for JSON encoding/decoding.
Automatically detects String, Int, Double, Bool, arrays, and optional (?) types from your JSON.
Creates separate struct definitions for nested objects with proper type references.
All conversion happens locally — your JSON never leaves your device.
JSON to Swift Struct Generator is useful in a variety of scenarios across different workflows:
Generating Swift model structs from API response JSON for iOS/macOS development
Creating Codable-compatible types from sample configuration files and data structures
Rapid prototyping of Swift data models from mock JSON data
Fields absent from your sample JSON will be absent from the generated struct. Ensure your sample includes every key that exists in your actual data.
If your JSON keys don't match Swift naming conventions, add a CodingKeys enum to customize the mapping between Swift property names and JSON keys.
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