C++ Class to JSON Schema Generator
Convert C++ structs/classes into JSON Schema and use the Mock Generator shortcut to create matching sample data.
Need JSON to C++?
Convert JSON data to C++ code
C++ code Input
JSON Schema Output
Paste your C++ headers to produce a JSON Schema instantly.
Supports public members, STL containers, nested structs, and default member values.
Frequently Asked Questions
Which C++ constructs are supported?
The converter reads class/struct definitions with public members, typed fields, STL containers like std::vector/std::map, primitive types, and nested structs. Pointers and references are treated as optional fields so you can paste DTO headers or message objects directly.
How are C++ types mapped to JSON Schema?
Primitive types map to JSON strings/numbers/booleans. std::vector<T>, std::list<T>, arrays, and std::array become schema arrays, while std::map<string, T> becomes an object with additionalProperties. Unknown user-defined types fall back to strings unless a class with that name is also provided.
Does it handle modern C++ syntax?
Yes. You can include using declarations, default member values, const qualifiers, and templates (for simple cases). Everything runs entirely inside your browser—no source code leaves your machine.
How do I get mock JSON payloads?
After the schema is generated, click "Generate Mock Data" to open the Mock Generator with the schema preloaded. Configure locales, array counts, and optional fields to instantly create example payloads.