check json format

src/backend/api.js

@@ -21,6 +21,8 @@ export async function post(path, body) {
         body: JSON.stringify(body)
     });
 
+    console.log('Data from API:', res);
+
     if (res.status === 200) {
         const data = await res.json();
         console.log("Received post:", data);