well to explain that a little, everything that comes from outside of QML (a file on your disk, network etc) goes through c++, you might not see it but If you use an Image in QML the file gets loaded and decoded in c++ and then transferred to QML.
Usually you don’t need to see the raw JSON content, so the question here is what you want do to? You can just debug the decoded JSON object/array in QML, that should be fine unless there is an error and you need to know why.
In that case you should learn how to use the debugger with QML and c++, you can just set a breakpoint in Qt Creator and see the value at that point without printing the value to the console. You might want to read this article about debugging in QML http://qt-project.org/doc/qt-5.0/qtquick/qtquick-debugging.html
For simple debug purposes of javaScript objects your can also use
JSON.stringify(obj)
// use it with my JsonFile like this
console.log(JSON.stringify(jsonFile.read()))
that might look stupid to parse the JSON string and then convert it back to a string, but it is the easiest way for debugging purposes since the console cannot print objects (you will just see [object Object] or something simular).
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