This example demonstrates how to convert the bee colony loss dataset from CSV format into a hierarchical JSON string suitable for visualization. It uses React with D3 v5 to parse the data file via `d3.csv`, then manually constructs the string by iterating through rows and tracking state and year transitions. The resulting JSON structure nests data by state, year, and metric categories like loss, beekeepers, and colonies, as output to the console for copy-paste use.