How to use JSON to C++
- Paste a representative JSON sample, ideally one with all the optional fields filled in.
- Set the name of the root type, and decide whether you want helper code as well or types only.
- Copy the generated C++ code into your project.
About JSON to C++
Writing model classes by hand for a big JSON payload is dull, and it is where typos creep in. Paste a sample here and the generator works out the structure: which fields exist, which are objects, which are arrays and what type each value has. The output is structs in a quicktype namespace, with from_json and to_json functions for the nlohmann/json library.
The output needs the nlohmann/json single header library, plus a small helper block for optional values that is included in the output. Everything runs in your browser, so your sample data stays on your machine.
Using the generated code
Include the nlohmann json header, then auto root = nlohmann::json::parse(text).get<quicktype::Root>();.
Optional members use std::shared_ptr<T> and are null when the key is missing.