JSON to Code — TypeScript, Go, Rust, Python & more
Paste JSON and generate type definitions in TypeScript, Go, Rust, Python, Java, Kotlin, Swift or C# — pick the language from a dropdown. Free, no upload.
🔒 Generated in your browser — your JSON is never uploaded.
Turn JSON into typed code, in any language
Paste a JSON sample, pick your target language, and get ready-to-paste type definitions — nested objects become nested types, arrays become typed lists, and field types are inferred from the values. Supports TypeScript interfaces, Go structs (with json tags), Rust structs (serde), Python dataclasses, Java and Kotlin classes, Swift Codable structs and C# classes. Everything runs in your browser — your JSON is never uploaded.
Frequently asked questions
Which languages are supported?
TypeScript, Go, Rust, Python (dataclasses), Java, Kotlin, Swift (Codable) and C#. Choose the target from the Language dropdown; the same JSON generates code for any of them.
Does it handle nested objects and arrays?
Yes. Nested objects become nested type definitions and arrays become typed collections, with names derived from the field and root name you set.
Is my JSON uploaded anywhere?
No. Parsing and code generation run entirely in your browser, so sensitive payloads never leave your device.