How do I drop a MongoDB database from the command line?

Deleting a database in MongoDB can be achieved through various methods, with the most common approach being via the MongoDB command line interface. Below are the step-by-step instructions for deleting a MongoDB database using the command line:

1. Open the command line interface:
   Launch the terminal or command prompt.

2. Connect to the MongoDB instance:
   If MongoDB is running locally, connect using the following command:

   bash
   mongo

   For remote servers or specific ports, use:

   bash
   mongo --host <hostname or IP> --port <port number>

3. Select the target database:
   Before deletion, select the database using the use command:

   bash
   use <database name>

4. Delete the database:
   Execute the db.dropDatabase() command to remove the selected database and all its data:

   bash
   db.dropDatabase()

For example, to delete a database named testdb, follow these commands:

bash
mongo                   # Connect to MongoDB
use testdb              # Select the testdb database
db.dropDatabase()       # Delete the database

Always back up any critical data before executing deletion operations, as the db.dropDatabase() command permanently removes data with no recovery option. Exercise caution when performing such operations.