How to create a user in MongoDB v3?

To create a user in MongoDB v3, use the createUser() method. This allows you to create a user and upon creation also add the user, password and role. These roles assign permissions. The syntax is as follows -

use admin
db.createUser(
   {
      user: “yourUserName",
      pwd: "yourPassword",
      roles: [ { role: "yourPermission", db: "yourDatabase" } ]
   }
);

Let us implement the above syntax to create a user in MongoDB v3 -

> use admin
switched to db admin
> db.createUser(
...    {
...       user: "Robert",
...       pwd: "robert",
...       roles: [ { role: "readWrite", db: "sample" } ]
...    }
... );

Above, we have set the following for the new user -

User: Robert
Password: robert
Roles: readWrite
This will produce the following output:
Successfully added user: {
   "user" : "Robert",
   "roles" : [
      {
         "role" : "readWrite",
         "db" : "sample"
      }
   ]
}

us A new user "Robert" has been successfully created above.

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