make count.js more foolproof

Author: NielsHoffmann

.gitignore

@@ -3,3 +3,4 @@
 node_modules/
 package-lock.json
 Presentatie/
+.vscode/settings.json

data/processes/countFeatures/count.js

@@ -1,5 +1,10 @@
 export default async function count(uri) {
-  const res = await fetch(uri);
-  const body = await res.json();
-  return body.numberMatched;
+  if (uri.endsWith("/items")){
+    const res = await fetch(uri);
+    const body = await res.json();
+    return body.numberMatched;
+  } else {
+    return "not a valid endpoint..."
+  }
+  
 }