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.
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JSON to Swift Struct Generator is a free online tool that helps you convert json to swift codable structs instantly. generate type-safe swift structs with codable conformance from json samples. With 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, the tool makes json tasks straightforward and efficient. Every operation runs locally in your browser — your data stays private and never leaves your device.
JSON to Swift processes everything on your device, eliminating the need for server uploads or software installation. This approach is particularly useful for generating swift model structs from api response json for ios/macos development creating codable-compatible types from sample configuration files and data structures. Whether you need codable generation or more advanced json operations, JSON to Swift delivers reliable results without compromising on security or performance.
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.
No. All conversion happens locally in your browser.
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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