Articles → MONGODB → Unique Index In Mongodb

Unique Index In Mongodb

This article describes how to create a unique index in MongoDB.

Purpose

The unique index makes sure that duplicate values are not inserted into the field.

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

Consider the following collection: -

A new index is created in the name field.

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

Query/Feedback