Solving the undefined Destructuring Issue with Mongoose Queries in Your Next.js API

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Understanding the Issue: Getting undefined While Destructuring Mongoose Query Results

The Scenario

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You’ve encountered the error message:

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This error indicates that the query object is null, which means your Mongoose query did not return any results.

The Root Cause

Separate Ports: While testing applications, running your API on a different port than your front end might seem like a good idea, it can cause issues like this.

Solution Steps

To resolve the undefined destructuring issue when accessing the query object, follow these steps:

1. Ensure Correct CORS Configuration

Your API server needs to properly handle CORS requests. You already have some CORS headers in your code, but make sure that the headers allow for OPTIONS requests. The section of your code:

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Needs to be adapted to handle different methods the server might receive.

2. Handle Unsupported Requests

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3. Combine Routes (If Possible)

4. Query and Destructure Safely

Add a safety check before destructuring:

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Conclusion