First of all, download mongodb onto your machine with the appropriate utilities.
Create the database with mongosh under the name bankAgency.

Load the validations_database_crew.js file present in scripts with the load command.
Import the collections from the data_json folder with the mongoimport command.

* use bankAgency
* load("C:/Big-Data-Advanced/scripts/validations_database.js")
* mongoimport -d=bankAgency -c=accounts --file=C:\Big-Data-Advanced\data_json\accounts.json --jsonArray  
* mongoimport -d=bankAgency -c=clients --file=C:\Big-Data-Advanced\data_json\clients.json --jsonArray  
* mongoimport -d=bankAgency -c=agencies --file=C:\Big-Data-Advanced\data_json\agencies.json --jsonArray  
* mongoimport -d=bankAgency -c=managers --file=C:\Big-Data-Advanced\data_json\managers.json --jsonArray  
* mongoimport -d=bankAgency -c=transactions --file=C:\Big-Data-Advanced\data_json\transactions.json --jsonArray