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JSON to C++: Deserialize JSON to Modern C++ Classes

Generate C++ code with JSON serialization and deserialization support using modern C++ and nlohmann JSON library.

Step 1

Input Your JSON Data

Start by adding your JSON data that needs to be converted to modern C++ classes. The tool generates C++11/14/17 compliant code with modern features.

Example: Try This JSON Data

Copy and paste this JSON example to see how it works: 

{
  "product": {
    "id": 12345,
    "name": "Smart Watch Pro",
    "price": 299.99,
    "inStock": true,
    "tags": [
      "electronics",
      "wearable",
      "fitness"
    ],
    "specifications": {
      "battery": "48 hours",
      "waterproof": true,
      "screenSize": 1.4
    }
  }
}
Step 2

Review Generated Modern C++ Code

Watch as your JSON transforms into clean modern C++ classes using STL containers and best practices from the C++ Core Guidelines.

•
Modern C++ classes: Clean class definitions with public members and methods
•
STL containers: Uses std::string, std::vector, and other standard library types
•
JSON integration: Compatible with nlohmann/json library (most popular C++ JSON library)
•
RAII principles: Automatic memory management with RAII and no manual allocation
Step 3

Get Serialization Methods

Your conversion includes from_json() and to_json() methods for seamless JSON parsing and serialization using the industry-standard nlohmann JSON library.

C++ Code Output

Your JSON becomes these modern C++ classes:

#include <string>
#include <vector>
#include "nlohmann/json.hpp"

class Specifications {
public:
    std::string battery;
    bool waterproof;
    double screenSize;

    static Specifications from_json(const nlohmann::json& j);
    nlohmann::json to_json() const;
};

class Product {
public:
    int id;
    std::string name;
    double price;
    bool inStock;
    std::vector<std::string> tags;
    Specifications specifications;

    static Product from_json(const nlohmann::json& j);
    nlohmann::json to_json() const;
};
Step 4

Copy or Download C++ Code

Perfect! Now you can use your modern C++ classes in your applications with automatic memory management and type safety.

•
Copy to clipboard for immediate use in your C++ projects
•
Download .hpp file for header-only integration
•
Works with CMake - Easy integration with CMake build systems
•
Cross-platform - Compatible with GCC, Clang, MSVC, and other C++ compilers

What is JSON to C++ Conversion?

JSON to C++ conversion transforms JSON data structures into modern C++ classes using STL containers like std::vector and std::string. This process generates C++11/14/17 compliant code with automatic memory management following RAII principles.

The generated C++ code integrates seamlessly with the popular nlohmann/json library, providing type-safe JSON parsing and serialization methods. Perfect for modern C++ applications, game development with Unreal Engine or Unity, and high-performance systems following the C++ Core Guidelines.

Frequently Asked Questions

What C++ JSON library should I use with the generated code?

The generated code works with nlohmann/json, the most popular modern C++ JSON library with over 40k GitHub stars. It's header-only, has no dependencies, and is used by companies like Microsoft, Apple, and Google. Make sure to validate your JSON before generating C++ classes.

Is the generated C++ code compatible with C++11, C++14, C++17, and C++20?

Yes! The generated code follows modern C++ standards (C++11 and above) and is compatible with all major compilers including GCC, Clang, and MSVC. The code uses STL containers and follows the C++ Core Guidelines recommended by Bjarne Stroustrup and Herb Sutter.

How does memory management work in the generated C++ code?

The generated code uses STL containers (std::vector, std::string) which automatically manage memory through RAII (Resource Acquisition Is Initialization). No manual memory management (new/delete) is needed. This prevents memory leaks and follows modern C++ best practices as outlined on cppreference.com.

Can I use this for game development with Unreal Engine or Unity?

Absolutely! The generated modern C++ classes work great with Unreal Engine (C++ based) for game data, configuration files, and API integration. For Unity (C# based), check our JSON to C# converter instead. The code is also perfect for Qt applications and other C++ frameworks.

How do I integrate nlohmann/json library into my project?

nlohmann/json is header-only! Simply download json.hpp or install via package managers: vcpkg install nlohmann-json, conan install nlohmann_json, or use CMake FetchContent. Full installation instructions are on the official documentation.

Is the JSON to C++ converter free to use?

Yes, completely free with no limitations on JSON complexity, code generation, or usage frequency. No registration required. Generate unlimited modern C++ classes from JSON data at no cost. Perfect for professional C++ development, open-source projects, and commercial applications.

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