5 files changed, 86 insertions, 0 deletions
diff --git a/src/App.tsx b/src/App.tsx
new file mode 100644
index 0000000..9687afc
--- /dev/null
+++ b/src/App.tsx
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+import Graph from "./components/Graph";
+import { useCourseData } from "./hooks/useCourseData";
+
+export default function App() {
+  const catalog = useCourseData("/data/catalog_2025_fall.json");
+  return (
+    <>
+      <h1 style={{ textAlign: "center" }}>UIUC Course Prerequisite Graph</h1>
+      <Graph catalog={catalog} />
+    </>
+  );
+}
diff --git a/src/components/Graph.tsx b/src/components/Graph.tsx
new file mode 100644
index 0000000..5e81b38
--- /dev/null
+++ b/src/components/Graph.tsx
@@ -0,0 +1,49 @@
+import CytoscapeComponent from "react-cytoscapejs";
+import cytoscape from "cytoscape";
+import dagre from "cytoscape-dagre";
+import { useMemo } from "react";
+
+cytoscape.use(dagre);
+
+type Catalog = Record<string, string[]>;
+
+export default function Graph({ catalog }: { catalog: Catalog }) {
+  const elements = useMemo(() => {
+    const els: any[] = [];
+    Object.keys(catalog).forEach(id => {
+      els.push({ data: { id } });
+      catalog[id].forEach(p =>
+        els.push({
+          data: { id: `${p}->${id}`, source: p, target: id }
+        })
+      );
+    });
+    return els;
+  }, [catalog]);
+
+  return (
+    <CytoscapeComponent
+      elements={elements}
+      stylesheet={[
+        {
+          selector: "node",
+          style: {
+            "background-color": "#3182bd",
+            label: "data(id)",
+            color: "#fff"
+          }
+        },
+        {
+          selector: "edge",
+          style: {
+            width: 2,
+            "target-arrow-shape": "triangle",
+            "curve-style": "bezier"
+          }
+        }
+      ]}
+      layout={{ name: "dagre", rankDir: "TB", nodeSep: 30, rankSep: 50 }}
+      style={{ width: "100%", height: "90vh" }}
+    />
+  );
+}
diff --git a/src/global.d.ts b/src/global.d.ts
new file mode 100644
index 0000000..d2d9941
--- /dev/null
+++ b/src/global.d.ts
@@ -0,0 +1,2 @@
+declare module 'react-cytoscapejs';
+declare module 'cytoscape-dagre';
diff --git a/src/hooks/useCourseData.ts b/src/hooks/useCourseData.ts
new file mode 100644
index 0000000..74281fa
--- /dev/null
+++ b/src/hooks/useCourseData.ts
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+import { useEffect, useState } from "react";
+
+export function useCourseData(file = "/data/catalog_2025_fall.json") {
+  const [catalog, setCatalog] = useState<Record<string, string[]>>({});
+
+  useEffect(() => {
+    fetch(file)
+      .then(r => r.json())
+      .then(setCatalog)
+      .catch(console.error);
+  }, [file]);
+
+  return catalog;
+}
diff --git a/src/main.tsx b/src/main.tsx
new file mode 100644
index 0000000..3fd3a69
--- /dev/null
+++ b/src/main.tsx
@@ -0,0 +1,9 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App";
+
+ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);