Generate strongly-typed classes in your favorite language
Paste a JSON document and get idiomatic, strongly-typed model code back in Java, Python, Go, or C++. Types are inferred from the values in your data, nested objects become their own named types, and arrays of objects are widened so a single shape fits every element. Everything runs in your browser: your JSON is never uploaded, and there is no account to create.
Java (Lombok POJOs and Records), Python (dataclasses), Go (structs with encoding/json tags), and C++ (classes with nlohmann::json bindings).
No. Parsing, type inference, and code generation all run in your browser using JavaScript. Your JSON is never sent to a server, and there is no account, tracking, or storage beyond your own browser.
No. The generator is free to use with no sign-up and no usage limits.
Each nested JSON object becomes its own named type, derived from the key it appeared under. Arrays of objects are widened across every element, so a field that is a whole number in one element and a fraction in another gets a type that holds both.