Generate TypeScript, Go, Python, Java, C# or Rust types from JSON
How to use
Paste a sample JSON object (or load the example).
Pick your target language: TypeScript, Go, Python, Java, C#, or Rust.
The matching typed model is generated instantly — nested objects become their own types.
Copy the code into your project.
Why use this tool
6 languages: Generate TypeScript interfaces, Go structs, Python dataclasses, Java POJOs, C# classes, or Rust serde structs from the same JSON.
Smart type inference: Handles nested objects, arrays, optional fields, and int-vs-float automatically — not just a flat dump.
Idiomatic output: Proper naming and serialization tags (json tags, @JsonProperty, serde rename) so the code drops straight into your project.
100% private: Your JSON is parsed in your browser and never uploaded — safe for real API payloads.
Frequently asked questions
Which languages can it generate?
TypeScript interfaces, Go structs, Python dataclasses, Java classes (POJOs), C# classes, and Rust serde structs — all from the same pasted JSON.
How does it handle optional or missing fields?
If you paste an array of objects where some keys are missing from certain items, those keys are marked optional (e.g. `?` in TypeScript, pointer + omitempty in Go, Optional in Python/Rust).
Does it handle nested objects and arrays?
Yes. Nested objects become their own named types, and arrays infer their element type — including merging differently-shaped objects inside the same array.
Is my JSON sent to a server?
No. Parsing and code generation happen entirely in your browser, so even real API responses and private payloads stay on your device.
What if my numbers are sometimes whole and sometimes decimal?
The generator widens to a floating-point type (e.g. number/float64/float) so the model fits all the sample values.