This example shows an interactive Sankey diagram that visualizes API endpoint flows from a Swagger specification, with data loaded from a JSON file and laid out using the D3.js library. The diagram displays nodes and links where users can drag nodes to reposition them, triggering a relayout that recomputes the link paths. The visualization uses D3 v3.5.17's `d3.sankey` plugin and `d3.behavior.drag`. While the main chart is static, the repository also includes an animated SVG face with transitioning eyebrows, demonstrating additional D3 animation capabilities separate from the Sankey view.