About JSON to TypeScript, Go & Rust Types Generator
Scaffolding data models from an API response is tedious busywork — reading a JSON payload key by key and hand-writing the matching types. This JSON to TypeScript converter does it for you: paste a sample payload and instantly get strongly typed code. It also generates Go structs, Rust structs, Python classes, Java, C#, Kotlin, and Swift, so the same sample becomes ready-to-paste types in whatever language your project uses.
The generator infers field types from the values it sees, names the top-level type for you, and creates nested types for objects and arrays automatically. It's perfect for turning a real "json to go struct" or "json to types" task into a one-paste job instead of a manual transcription.
Everything runs in your browser. Your JSON is never uploaded — the type-inference engine loads on demand and works completely offline.
Features
- Generate TypeScript, Go, Rust, Python, Java, C#, Kotlin, and Swift from one sample
- Nested objects and arrays become their own named types automatically
- Name the top-level type and copy or download the result
- Runs entirely in the browser — your JSON never leaves the device
How to use
- Paste a sample JSON payload into the input pane.
- Pick a target language from the Language selector.
- Click Generate to produce the typed code.
- Copy the generated types straight into your project.
Frequently asked questions
Which languages can it generate?
TypeScript interfaces, Go structs, Rust structs, Python classes, Java, C#, Kotlin data classes, and Swift. Pick the target from the Language selector and the same JSON sample is converted to that language.
How are field types inferred?
Types are inferred from the values in your sample — numbers become numeric types, true/false become booleans, nested objects become their own named types, and arrays become typed collections. The richer and more representative your sample, the more accurate the output.
Does my JSON get sent to a server?
No. The type-inference engine runs locally in your browser. Your sample JSON never leaves your device, so it is safe to use with private or production payloads.
A field that is sometimes missing — will it be optional?
If you provide an array of objects and a key is absent from some elements, the generator marks that field optional. Including a couple of representative items in the sample helps it spot optional and nullable fields.
Related tools
Everything runs locally in your browser — your input is never uploaded.