How to Resolve 'TypeError: resolver is not a function' in Next.js with MongoDB

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Understanding the Error

The 'TypeError: resolver is not a function' often occurs due to:

Incorrect Function Import: The function you are trying to invoke might not be imported correctly.

Mismatched Export Type: The function might be exported as a named export but imported as a default export, or vice versa.

Step-by-Step Resolution

Verify Function Export and Import

First, check the module where the resolver function is defined:

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Ensure you import it correctly based on how it's exported:

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If the function is exported as a default export:

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Then import it accordingly:

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Check for Middleware Integration

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Debugging Mongoose Connections

If the error relates to Mongoose and MongoDB setup, ensure your database connection is set up correctly and available:

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Then, integrate it into your API route:

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Correct Usage of Axios

If you're making client-side requests using Axios, ensure the API endpoint and request configurations are correctly set:

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Conclusion