For Importing a mongodb use the following command
$ mongodump --db database_name
This will dump the json/bson files into dump/db_name folder
Or specify a directory with -o option
$ mongodump --db database_name -o path_to_folder
By specifying username and password
$ mongodump --db database_name -o /path/to/folder/ --username=my_user --password="my_password"
For Exporting a mongodb use the following command
$ mongorestore --db database_name path_to_the_json_bson_files
path_to_the_json_bson_files
=> That we already imported and stored before.
Import one document
$ mongodump --db=db_name --collection=collection_name --out=path_to_folder_to_import $ mongorestore --db=new_db_name --collection=collection_name path_to_folder_to_import/db_name/collection_name.bson