JSON → 9 typed languages
TypeScript interfaces, Pydantic v2 models, Go structs with serde tags, Rust serde derives, Kotlin data classes, C# records, Java records, Swift Codable, PHP 8 classes — from one JSON sample.
Generating typed definitions from JSON samples is one of the most repeated dev tasks of the API era. Wire format is JSON; codebases are typed. Manual translation is tedious — especially across nine languages with different idioms for nullability, naming conventions, and serialization metadata.
The Qaynaq Labs JSON → Types converter analyzes your JSON sample once and emits idiomatic, compile-ready definitions for TypeScript, Pydantic v2, Go (with json tags), Rust (with serde derives), Kotlin (data class), C# (record), Java (record), Swift (Codable), and PHP 8. Nested objects become their own types; optional fields are detected from null values; every output is paste-ready.
Frequently asked
Does it handle nested objects?
Yes — nested objects get their own named types. The converter walks the entire shape.
What about optional / nullable fields?
Fields whose value is null in the sample are marked nullable in every target language using the idiomatic null-marker for that language (Optional[T] = None in Python, *T in Go, Option<T> in Rust, ?T in C#, T? in Kotlin/Swift).
Will it use 'any' anywhere?
No. Ambiguous fields use 'unknown' in TypeScript, 'object' in Java/C#, and serde_json::Value in Rust — never the unsafe 'any'.
Can I copy each language separately?
Yes, every code pane has a Copy button. Click and paste into your project.