Interactive zoomable circle packing visualization of software package hierarchies, rendered as nested circles in SVG. Built with D3 v3, it displays the flare.json dataset with circles sized by package size and grouped by category. Clicking any circle smoothly animates the view to zoom into that package’s children, while clicking again zooms back out. Leaf nodes appear as white circles, and hover effects highlight nodes with a black stroke. The visualization supports drill-down exploration of the hierarchical structure with animated transitions.