mongo: drop collection using the terminal

Straight from the manual page, use the --drop option:

--drop
Modifies the import process so that the target instance drops every collection before importing the collection from the input.

So you can remove the collection you are importing into and start new.

mongoimport -d myDB -c myCollection --drop --file file.json

bash mongodb command-line-interface

Call the db.collection.drop() method on a collection to drop it from the database.

In bash use mongo <dbname> --eval "db.<collectionName>.drop()"

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