JSON to Model Generator
Paste JSON, an iOS NSLog dictionary dump or an Android log print — get type-safe model code for Swift, Kotlin, TypeScript, Dart, Java or Python. All local — your data never leaves the browser.
Input — JSON / NSLog / Logcat
Output
FAQ
What input formats are supported?
Strict JSON, plus the debug-print formats developers actually paste: iOS NSLog dictionaries (key = value; with (...) arrays) and Android/Java toString() maps (key=value, key2={...}). The parser auto-detects and normalizes them, and tells you which format it used.
Is my data uploaded to a server?
No. Parsing and code generation are pure JavaScript running in your browser — API responses, tokens and user data stay on your device.
How are types inferred?
Nulls become optional, whole numbers become Int/Long/int, decimals become Double/double/float, and array elements are merged — a key missing in some elements becomes an optional field. snake_case keys are converted to camelCase with the right mapping (Swift CodingKeys, Gson @SerializedName, and so on).
Which languages can it generate?
Six: Swift Codable structs, Kotlin data classes with Gson annotations, TypeScript interfaces, Dart classes with fromJson/toJson, Java POJOs with getters/setters, and Python dataclasses.