JSON to XML Converter (C++)

This is a simple C++ program that converts a JSON file to an XML file. It uses:

• nlohmann/json – for parsing JSON
• pugixml – for writing XML

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📦 Dependencies

You can install both libraries via Homebrew on macOS:

brew install nlohmann-json pugixml

Alternatively, you can use the source files directly (see below).

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🛠️ Build Instructions

Option A – Using Homebrew-installed Libraries

g++ -std=c++17 main.cpp -o json2xml \
  -I/opt/homebrew/opt/nlohmann-json/include \
  -I/opt/homebrew/opt/pugixml/include \
  -L/opt/homebrew/opt/pugixml/lib -lpugixml

Option B – Using Local Headers and Source Files

1. Download:

   • json.hpp
   • pugixml.hpp
   • pugixml.cpp

2. Place them in the same folder as main.cpp.

3. Compile:

g++ -std=c++17 main.cpp pugixml.cpp -o json2xml

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🚀 Usage

./json2xml input.json output.xml

Example:

./json2xml sample.json result.xml

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📂 Example Input (sample.json)

{
  "name": "Ashkan",
  "age": 28,
  "skills": ["C++", "Python", "XML"]
}

📄 Example Output (result.xml)

<root>
  <name>Ashkan</name>
  <age>23</age>
  <skills>
    <item>C++</item>
    <item>Python</item>
    <item>XML</item>
  </skills>
</root>

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📌 Notes

• Arrays are written as repeated <item> nodes — you can change it in the code.
• The root XML element is always named <root> — you can change it in the code.
• For large files, this implementation loads everything into memory. For massive JSON files, consider a streaming parser (e.g. cuJSON, simdjson).

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