taking mongo db dump and restore

Here is how you can take dump of  mongo collection in csv file.

 mongoexport -d -c -q '{query}' -f  field1,field2,field3,...,fieldn --csv -o

      e.g.

 mongoexport -d seo_metadata -c seo_product -q '{"create_date" : {"$lt":"2015-08-31"}}' -f create_date,update_date,object,meta_keyword,meta_title,meta_content --csv -o /var/tmp/outfile.csv

mongoimport restores a database from a backup taken with mongoexport.

 mongoimport --db --collection --type csv --file

mongoimport --db users --collection contacts --type csv --file contacts.csv

Mongo import/export can be done in json format too. for more information visit mongo documentation