Articles → MONGODB → Unique Index In Mongodb

Unique Index In Mongodb

In this article, we will create a unique index in MongoDB.

Purpose

The unique index ensures that no duplicate value is inserted into the field.

db.[collection.createIndex({field:1},{unique:true})

Consider the following collection: -

On the name field, a new index is created.

Once the index is created, insert a duplicate value of the name field. The error message appears.

Query/Feedback