Why do i get duplicate key error in mongodb?

Because of the unique constraint, MongoDB will only permit one document that lacks the indexed field. If there is more than one document without a value for the indexed field or is missing the indexed field, the index build will fail with a duplicate key error.
Keeping this in consideration, how to avoid duplicate entries in MongoDB?
To avoid duplicate entries in MongoDB, you can use createIndex (). Let us implement the above syntax. Now insert some records in the above collection. Let us insert another record. Display all documents from a collection with the help of find () method.
In fact, what is _ID_ and objectId in MongoDB? The _id_ string is the name of the unique index, and the ObjectId () is the duplicate value. The below code is one way you might get the above error message. MongoDB collections always have a unique index on _id, so trying to insert a document with a duplicate id will cause a duplicate key error.
Additionally, why does my index build fail with a duplicate key error?
If there is more than one document without a value for the indexed field or is missing the indexed field, the index build will fail with a duplicate key error. You can combine the unique constraint with the sparse index to filter these null values from the unique index and avoid the error.
Also Know, why am I getting a duplicate key error?
This error is often caused by null or undefined field values. null and undefined count as distinct values, so if you declare a field email as unique, two documents cannot have email = undefined. The below example creates two documents without an email property, which causes a duplicate key error.

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