Mathwrist’s Graphical Debugging Extension (GDE) is an extension to the IDE of Microsoft Visual Studio 2022. It helps scientists and engineers to directly view their data and math objects while doing C++ numerical programming or prototyping works. Users can provide a specification json file that contains user-defined vector and matrix data types for plotting. It also naturally integrates with Mathwrist's C++ numerical programming library (NPL). NPL objects are automatically recognized in GDE for visualization. By rendering scientific plots inside the Visual Studio IDE, users can obtain immediate visual feedback along the course of developing and refining their algorithms or mathematical models.