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1. Establish a connection to MongoDB via mongo CLI - See Connect to MongoDB with mongo CLI
   
   

2. The user information is configured globally for the entire MongoDB within the admin DB, so you have to switch to this DB.
   List existing dbs with show dbs command

   No Format
   PS C:\Users\XXX> mongo --authenticationDatabase admin -u bvq -p P@ssw0rd MongoDB shell version v3.4.4 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.4 > show dbs admin 0.000GB bvq 0.401GB local 0.000GB

3. Switch to admin db with use admin

   No Format
   > use admin switched to db admin

4. Use db.changeUserPassword() to change the password for the user logged in

   No Format
   db.changeUserPassword("bvq", "NEW_PASSWORD")

   In this example password is changed to NEW_PASSWORD for user bvq
   
   

5. After executing this command the password will be changed

   No Format

   PS C:\Users\XXX> mongo --authenticationDatabase admin -u bvq -p P@ssw0rd MongoDB shell version v3.4.4 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.4 2017-12-05T18:50:07.771+0100 E QUERY [thread1] Error: Authentication failed. : DB.prototype._authOrThrow@src/mongo/shell/db.js:1459:20 @(auth):6:1 @(auth):1:2 exception: login failed PS C:\Users\fschenke> mongo --authenticationDatabase admin -u bvq -p NEW_PASSWORD MongoDB shell version v3.4.4 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.4 > exit bye PS C:\Users\XXX>

List existing user

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1. Establish a connection to MongoDB via mongo CLI - See Connect to MongoDB with mongo CLI
   
   

2. Switch to admin db with use admin

   No Format
   > use admin switched to db admin

3. Use db.getUsers() to list existing users

   No Format
   > db.getUsers() [ { "_id" : "admin.bvq", "user" : "bvq", "db" : "admin", "roles" : [ { "role" : "root", "db" : "admin" } ] } ]