I am developing a web application using MERN and have encountered a recurring error when using Model.findOne() as it no longer supports callbacks. I have attempted to resolve this issue multiple times, but I am still experiencing this error.

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To resolve the issue with Model.findOne() not supporting callbacks, you can use Promises instead. Here is an example of how to use Promises with Model.findOne():

Model.findOne({ name: 'John' })
  .then((result) => {
    // Do something with the result
  })
  .catch((error) => {
    // Handle the error
  });

In this example, the Model.findOne() method returns a Promise instead of invoking a callback. The .then() method is used to handle the success scenario as it takes a callback function that will be called once the Promise is resolved. The .catch() method is used to handle the error scenario as it takes a callback function that will be called if the Promise is rejected.

Make sure to update all your Model.findOne() calls to use Promises, so that the error with callbacks is resolved in your application.