This example demonstrates how to load and parse a CSV file in a React application using D3.js. It displays the Iris dataset as formatted JSON text in a `<pre>` element, showing the parsed data structure. The code uses D3's `csv()` method within a `useEffect` hook to fetch and parse `data.csv`, then stores the result in React state. A separate effect triggers a visualization function that renders the data using D3's `select()` and text manipulation. The Iris dataset, from UCI Machine Learning Repository, contains measurements of sepal and petal dimensions for three flower species.