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In this article, we will discuss the default username and password and how to find username and password in MongoDB.

Default Username and Password in MongoDB

By default, MongoDB does not have access control enabled, so there is no default user or password. Use the command line option --auth or the security.authorization configuration file setting to enable access control.

Here are the steps you can follow. First, open a terminal and start the MongoDB daemon.

mongod --port 27017 --dbpath /data/db

Enter the mongo shell in a new terminal tab.

 mongo --port 27017

Create an administrator user.

use admin
db.createUser(
  {
    user: "user123",
    pwd: "pass123",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" },
             { role: "dbAdminAnyDatabase", db: "admin" },
             { role: "readWriteAnyDatabase", db: "admin" }
           ]
  }
)

Type quit()quit. Press ctrl-c to kill the process on the mongo daemon page and restart MongoDB with the --auth option enabled.

$ mongod --auth --port 27017 --dbpath /data/db
2019-02-23T16:18:38.539+0800 I CONTROL [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
...
...
2019-02-23T16:18:38.553+0800 I CONTROL  [initandlisten] options: { net: { port: 27017 }, security: { authorization: "enabled" }, storage: { dbPath: "/data/db" } }

Login to the mongo shell using the user created earlier.

$ mongo --port 27017 -u "user123" -p "pass123" --authenticationDatabase "admin"
MongoDB shell version v4.0.2
connecting to: mongodb : //127.0.0.1:27017/
MongoDB server version: 4.0.2
...

Select Username/Password (MONGODB-CR/SCRAM-SHA-1) to connect to your MongoDB deployment.

1. Checks the Username/Password (MONGODB-CR/SCRAM-SHA-1) or Username/Password (SCRAM-SHA-256) from the proxy authentication mechanism. Cloud Manager automatically generates the username and password for the proxy.
2. Click Save.

grammar:

db.getUser(username)

The parameters for the query are name, description, and type: username. You must execute the viewUser operation on the database of another user to view another user's information.

Below is the query to change the MongoDB user password.

Query:

db.changeUserPassword("user", "12345");

Authorize MongoDB

1. Start MongoDB without authentication.
2. After that, connect to the server using the mongo shell.
3. Create a user administrator.
4. Enable authentication in the MongoDB configuration file.
5. Now connect and authenticate as user admin.
6. Finally, create additional users as needed.

Finding Passwords in MongoDB

You can specify the password directly as you did with earlier versions of the mongo shell. A user document contains a username and password and, optionally, an authentication mechanism and a digest password flag.

A user name and password that has access to the given database.