How to make user's email unique in mongoDB?

Question

I am making a collection of user\'s data. This will be pretty basic consisting of user\'s email, user\'s password (hashed), and an array of strings.

{
    em         


        

Answer 1

Use unique keyword, or simply make _id value to be email.

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

Answer 2

Mongodb ensureIndex has been deprecated, use createIndex instead.

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

Answer 3

You can do it by creating a unique index for your email field.

http://docs.mongodb.org/manual/tutorial/create-a-unique-index/