JSON to C++ Converter

Struct Name:

Use Namespace

JSON Input

C++ Output

What Is JSON to C++?

C++ has no built-in JSON support. Libraries like nlohmann/json or RapidJSON handle parsing. This tool generates C++ structs and classes from your JSON so you can map data to typed structures. The JSON specification defines the input format.

Conversion runs in your browser. Set the struct name and optionally a namespace in the config panel. Nothing is sent to a server. The generated types work with C++11 and later. For plain C, use JSON to C.

How to Use This Tool

Paste or Upload JSON

Paste your JSON or upload a file. Set the struct name and optionally a namespace in the config panel. Invalid JSON will show an error. Use the JSON Validator to check syntax first.

Review the C++ Output

The right panel shows generated C++ structs. Add includes for nlohmann/json or RapidJSON and parsing logic as needed. Arrays become std::vector or similar containers.

Copy or Download

Use Copy or Download. For formatting JSON first, use the JSON Formatter. For validation, use the JSON Validator.

JSON to C++ Examples

Here is an example of generating C++ structs from a JSON object.

Example: Subscriber record

JSON input:

Input

Generated C++ output:

Output

When JSON to C++ Helps

When building C++ applications, game engines, or embedded systems that consume REST APIs or config files, you need typed structures for the JSON. Pasting a sample here gives you C++ structs and classes you can use with nlohmann/json or RapidJSON. Manually writing types for complex nested JSON is tedious; this tool infers the structure from your sample. For pulling out specific values first, use the JSON Path tool.

Frequently Asked Questions

Which JSON library should I use?

nlohmann/json is header-only and easy to integrate. RapidJSON is faster for large payloads. Both are widely used. nlohmann/json has a simpler API; RapidJSON is better for performance-critical parsing.

Does it support nested objects?

Yes. Nested JSON objects become nested structs. Arrays become std::vector or similar containers. The generator supports arbitrary nesting depth.

Is my data private?

Yes. Generation runs entirely in your browser. No JSON or code is sent to any server.

C++11 or C++17?

The generated code uses standard C++ features. std::vector and std::string work with C++11. nlohmann/json supports C++11 and later. For optional, use std::optional (C++17) or a library.

Can I use with Qt or Unreal?

Yes. The generated structs are plain C++. Qt has QJsonDocument; Unreal has its own JSON handling. You can adapt the generated types or use them as-is with nlohmann/json.