JSON to Swift Guide
Convert JSON to Swift Codable structs instantly. Generate type-safe Swift structs with Codable conformance from JSON samples. Use our free online tool to get started instantly.
What is JSON to Swift?
JSON to Swift is a free online tool that convert json to swift codable structs instantly. generate type-safe swift structs with codable conformance from json samples. It processes everything locally in your browser, so your data never leaves your device. Whether you are a developer looking to streamline your workflow or a professional needing quick and reliable results, this tool delivers instant, privacy-focused functionality without requiring any sign-up or software installation.
How to Use JSON to Swift
Using JSON to Swift is straightforward. Follow these steps to get started:
Step 1: Paste your JSON
Copy your JSON data and paste it into the input textarea above.
Step 2: Configure options
Toggle nullable detection for optional property generation.
Step 3: Copy the Swift code
Click Generate, then copy the Swift structs or download the .swift file.
Key Features of JSON to Swift
JSON to Swift comes with a range of features designed to make json tasks easier:
Codable Generation: Creates Swift structs with Codable conformance, making them ready for JSON encoding/decoding.
Type Inference: Automatically detects String, Int, Double, Bool, arrays, and optional (?) types from your JSON.
Nested Structs: Creates separate struct definitions for nested objects with proper type references.
Local Processing: All conversion happens locally  your JSON never leaves your device.
Tips & Best Practices
Get the most out of JSON to Swift with these tips:
Include all JSON keys in sample 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.
Use CodingKeys for custom mappings: 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.
Frequently Asked Questions
What Swift version is targeted?
The generator targets Swift 5.0+ with Codable protocol support. The generated code uses standard Foundation Codable conformance with let properties.
How are null values handled?
Fields with null values are marked as optional with ? (e.g., String?). Fields with consistent non-null values are marked as non-optional.
Is my JSON data sent to a server?
No. All conversion happens locally in your browser.