import os

host = ""
username = ""
password = ""
directory_to_export = ""
database = ""


all_collections = []


command = "mongoexport --host {} --username {} --password {} --db {} --collection {} --pretty --out {}/{}.json"

for c in all_collections:
  os.system(command.format(host, username, password, database, c, directory_to_export, c))