`useFindAndModify` is an invalid option.

What is the meaning of "useFindAndModify is an invalid option"?

If you are using MongoDB, then you may have come across the error message "useFindAndModify is an invalid option". This error message usually appears when you try to run an update or delete operation on a MongoDB database using Mongoose.

The "useFindAndModify" option used to be a valid option in earlier versions of Mongoose. However, starting from version 5.9.7, this option has been deprecated and is no longer valid.

What is the Solution?

If you encounter this error, it means that you need to update your code to remove the "useFindAndModify" option.

Instead of using "useFindAndModify", you should set the "useFindAndModify" option to false in your Mongoose connection configuration. Here's an example:

mongoose.connect('mongodb://localhost:27017/myapp', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
  // Set useFindAndModify to false
  useFindAndModify: false
})

By setting "useFindAndModify" to false, you are telling Mongoose to use the MongoDB driver's findOneAndUpdate() and findOneAndDelete() methods instead of the deprecated findAndModify() method.

Another solution is to use the new methods directly. Here's an example:

// Update document
const result = await MyModel.findOneAndUpdate(
  { _id: id },
  { $set: { name: 'New Name' } },
  { new: true }
)

// Delete document
const result = await MyModel.findOneAndDelete({ _id: id })

As you can see, you can use the findOneAndUpdate() and findOneAndDelete() methods directly to update and delete documents in MongoDB without the need for the "useFindAndModify" option.