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JSON to Code Generator
Generate typed code from JSON in 8 languages — Go structs, Python dataclasses, Java/C#/Dart/Kotlin classes, Rust/Swift structs. Handles nested objects, arrays, and null values.
Supported Languages
| Language | Output Type | Serialization |
|---|---|---|
| Go | Structs with json tags | encoding/json |
| Python | Dataclasses with type hints | dataclasses |
| Java | Classes with getters/setters | Jackson / Gson |
| C# | Classes with JsonPropertyName | System.Text.Json |
| Dart | Classes with fromJson/toJson | dart:convert |
| Rust | Structs with serde derive | serde |
| Swift | Codable structs | Codable |
| Kotlin | Data classes with @Serializable | kotlinx.serialization |
How It Works
- Nested objects — each nested object becomes a separate named type/class/struct, referenced by the parent.
- Arrays — element types are inferred from the first item. Object arrays merge all items for complete field coverage.
- Numbers — integers and floats are detected automatically (e.g.,
int64vsfloat64in Go). - Null values — mapped to each language's nullable/optional type (e.g.,
Any?in Kotlin,Optionin Rust). - Naming conventions — field names follow each language's idiom (camelCase, snake_case, PascalCase) with JSON key annotations.
- Everything runs in your browser — no data is sent over the network.
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