Check your route handlers to ensure they are returning the expected data. Verify any database queries to confirm they are fetching data correctly, and ensure that the responses are properly structured.

When a Node.js application returns empty responses, it can confuse users and indicate underlying issues in your application logic. Start by reviewing your route handlers to ensure that they are correctly retrieving and returning the expected data. If you are querying a database, verify that your queries are structured correctly and that they are actually fetching data. Utilize logging to capture the results of your database queries to see if they return the anticipated results. If your database query is returning an empty array or null, examine the query parameters and conditions to ensure they are correct. Additionally, check if your application logic properly processes the retrieved data before sending it in the response. Ensure that you are setting the response correctly, using methods like res.json() or res.send() to return data in the appropriate format. Finally, if you’re using asynchronous code, make sure that you are correctly awaiting promises and that there are no silent errors occurring before the response is sent. By systematically checking these aspects, you can effectively address issues related to empty API responses.