This interactive tree diagram visualizes hierarchical data with collapsible nodes, using rectangular boxes to represent each system component. The visualization loads JSON data describing a software architecture, displaying nodes as colored rectangles linked by directional arrows that indicate asynchronous connections. Built with D3.js v3, the example uses custom layout and behavior modules to enable zooming and dragging, while tooltips appear on hover to reveal additional node information. The tree structure supports expanding and collapsing child nodes, and the rendering dynamically adjusts the canvas size based on the tree's breadth and depth.