Add error message for 404

server.js

@@ -49,3 +49,7 @@ app.set("port", (process.env.PORT || 5000));
 app.listen(app.get("port"), function() {
   console.log("Node app is running on port", app.get("port"));
 });
+
+app.use((req, res, next) => {
+  res.status(404).send("Sorry can't find that!")
+})