How to connect to another MongoDB database as superuser using NodeJS?

Question

The solution to this problem works fine:

Instead of doing:

$ mongo my_db_name -u superuser -p 1234

I do

$ mongo admin -u superuser -p 1234 # connecting as super user to admin db
> use anotherDb

in shell.

---

Which is the solution in NodeJS?

I tried to connect to mongodb://superuser:1234@localhost:27017/my_db_name but I get this error:

{ [MongoError: auth fails] name: 'MongoError', code: 18, ok: 0, errmsg: 'auth fails' }

My code is:

var Db = require('mongodb').Db,
    MongoClient = require('mongodb').MongoClient;

MongoClient.connect("mongodb://superuser:1234@localhost:27017/my_db_name",
    function(err, db) {
       if (err) { return console.log(err); }
       console.log("Successfully connected.");
    }
); 

Note that superuser is the omnipotent user that can write and read rights in any database.

If I do MongoClient.connect("mongodb://superuser:1234@localhost:27017/admin (replaced my_db_name with admin) it connects successfully. Why?

How can I connect to the my_db_name using superuser and the password (1234)?

Answer 1

A solution would be to use a shell script that is executed from Nodejs side:

mongo <<EOF
use admin
db.auth("superuser", "1234");
use another_db
db.addUser({
   user: "test",
   pwd: "12345",
   roles: ["userAdmin"]
});
exit
EOF

Then I am able to use the following connection string: "mongodb://test:12345@localhost:27017/my_db_name".

This solution works, but I am still looking for the Mongo native solution.

Answer 2

You can use the Db().db(dbname) method to create a new Db instance sharing the same connection.

So you can authenticate to the admin db and change to another_db:

db.auth("superuser", "1234");
another_db = db.db("another_db");
another_db.addUser({...}