JSON to any language — generate typed structs
Paste a JSON sample and generate typed structures in Go, Python, Rust, Kotlin, Java or C#. It generates entirely in your browser (0 uploads, works offline).
How to use it
- Paste a representative JSON document.
- Choose the target language.
- Copy or Download the generated types.
FAQ
How do I turn JSON into a Go struct or Python dataclass for free?
Paste a sample and pick a language. This page infers the type of each field — string, integer, float, boolean, nested object or list — and emits idiomatic declarations, such as a Go struct with json tags or a Python dataclass, on your device with no upload.
Which languages are supported?
Go, Python (dataclasses), Rust (serde structs), Kotlin (data classes), Java (records) and C# (records).
Is my JSON uploaded anywhere?
No. Inference runs entirely in your browser and nothing is transmitted or stored, which you can verify by turning off your Wi-Fi. That makes it safe for JSON pulled from private APIs.
How does it handle nested objects and arrays?
Nested objects become their own named types, and arrays become a list of the element type inferred from the first item.
Limits
Types are inferred from one example, so optional fields, nullable values and union types need a human review afterwards.
Related
The JSON-to-TypeScript tool targets TypeScript; the JSON Schema validator checks data against a schema.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.