Importing a large tsv file to mongodb
@Marine1,You mongoimport syntax should be like as mention below example.

mongoimport --db test --collection stuff --type csv C:\data\Employee.csv --headerline


In the above example test is database name, stuff is collection name and Employee.csv is the file which i want to import in MongoDB database through mongo shell. And the Employee.csv file location is C:\data\Employee.csv.
In My case it has worked properly.

In your case the syntax should be like that

mongoimport --db databasename --collection collectionname --type csv  locationofbouffe.csv  --headerline


The syntax should be in the above mention format, if you want to import the header of the file then mention --headerline.

Note:- Make sure you are running the above mention script in inside the BIN of MongoDB Server.

Very Important Note : mongoimport would be to import a non-BSON file (such as JSON or CSV) into mongodb.