Check out example codes for "drop mongo database". It will help you in understanding the concepts better.
Code Example 1
// First show what databases have you gotten show dbs // then, use the database name that you want to drop use YOUR_DATABASE_NAME // now you can drop it db.dropDatabase() // show collections should be empty now show collections
Code Example 2
use DB_NAME // go to the db you want to delete db.dropDatabase() show dbs // droppped db will not be shown
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