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Check the database schema: Make sure that the unique property has been applied correctly to the relevant fields in the database schema.
Use indexing: You can use indexing to ensure that a particular field in the database has unique values only. You can apply indexing to specific fields using MongoDB's createIndexes method.
Use a pre-save hook: You can create a pre-save hook in Mongoose that checks for duplicates before saving any new documents. You can then throw an error if a duplicate is found.
Validate input: You can also validate user input before trying to save it to the database. This will ensure that you're not trying to save duplicate data.
Use a package: If the unique function in Mongoose is still not functioning properly, you can consider using a third-party package like mongoose-unique-validator to ensure uniqueness in your database.