123024.com · JSON → Class

JSON → Class

Turn a JSON sample into named classes and structs for TypeScript, Java, Go, Rust, or modern C++. Nested objects and arrays are inferred automatically, and all processing stays in your browser.

How to use

Choose a target language, then paste valid JSON. After you stop typing, the tool generates Root and any nested types automatically. Switching languages regenerates the same JSON immediately.

Tips

  • Arrays are inferred from every sample item; fields missing from some objects become optional where the target language supports it.
  • Java output uses Jackson JsonProperty annotations; Rust output uses serde and may use serde_json::Value. Add those libraries to projects that compile the generated code.
  • C/C++ produces modern C++17 structs because plain C does not provide classes, std::string, vectors, optionals, or variants.
  • Generated models are a starting point: review names, nullability, numeric widths, and serializer conventions before production use.
  • Invalid or incomplete JSON cannot be inferred. Finish the JSON structure, then pause briefly for conversion.