This file can be used as a Visual Studio Visualizer to aid in visualizing rapidjson structures within the Visual Studio debugger. Natvis visualizers are supported in Visual Studio 2012 and later. To install, copy the file into this directory:

%USERPROFILE%\Documents\Visual Studio 2012\Visualizers

Each version of Visual Studio has a similar directory, it must be copied into each directory to be used with that particular version. In Visual Studio 2015 and later, this can be done without restarting Visual Studio (a new debugging session must be started).