diff --git a/be/src/main.ts b/be/src/main.ts
index 1692db3..39c76a5 100644
--- a/be/src/main.ts
+++ b/be/src/main.ts
@@ -16,6 +16,9 @@ const run = async () => {
   }: JellyfinApiResponse = await fetchFromJellyfinApi();
 
   const transformedItems = transformItems(items);
+  console.log("transformedItems:", transformedItems);
+  const arrayOfExistingImdbIds = transformedItems.map(item => item.imdbId);
+  console.log("arrayOfExistingImdbIds:", arrayOfExistingImdbIds);
 
   // saveJsonToDisk({ totalItemCount, jellyfinItems: transformedItems });
 
@@ -23,11 +26,18 @@ const run = async () => {
     res.json(transformedItems)
   });
 
-  app.post("/bob", (req, res) => {
-    const { imdbId } = req.body;
-    console.log("imdbId:", imdbId);
+  // to do: endpoint to check single items against arrayOfExistingImdbIds
 
-    res.send("OK\n");
+  app.post("/bob", (req, res) => {
+    const { imdbId: requestedImdbId } = req.body;
+
+    if (arrayOfExistingImdbIds.includes(requestedImdbId)) {
+      res.send("DUP\n");
+    } else {
+      // to do: push to wishlist array
+      // to do: save wishlist array to disk
+      res.send("OK\n");
+    }
   })
 
   app.listen(1312);