Creating custom Object ID in MongoDB

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Yes it is perfectly fine to use a random value for an object id, if some value is present in _id field of a document being stored, it is treated as objectId.

Since _id field is always indexed, and primary key, you need to make sure that different objectid is generated for each object.
There are some guidelines to optimize user defined object ids :

https://docs.mongodb.com/manual/core/document/#the-id-field.

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