How to export collection to CSV in MongoDB?

Question

How do you export all the records in a MongoDB collection to a .csv file?

mongoexport --host localhost --db dbname --collection name --type=csv          


        

Answer 1

I could not get mongoexport to do this for me. I found that,to get an exhaustive list of all the fields, you need to loop through the entire collection once. Use this to generate the headers. Then loop through the collection again to populate these headers for each document.

I've written a script to do just this. Converting MongoDB docs to csv irrespective of schema differences between individual documents.

https://github.com/surya-shodan/mongoexportcsv

Answer 2

If you want, you can export all collections to csv without specifying --fields (will export all fields).

From http://drzon.net/export-mongodb-collections-to-csv-without-specifying-fields/ run this bash script

OIFS=$IFS;
IFS=",";

# fill in your details here
dbname=DBNAME
user=USERNAME
pass=PASSWORD
host=HOSTNAME:PORT

# first get all collections in the database
collections=`mongo "$host/$dbname" -u $user -p $pass --eval "rs.slaveOk();db.getCollectionNames();"`;
collections=`mongo $dbname --eval "rs.slaveOk();db.getCollectionNames();"`;
collectionArray=($collections);

# for each collection
for ((i=0; i<${#collectionArray[@]}; ++i));
do
    echo 'exporting collection' ${collectionArray[$i]}
    # get comma separated list of keys. do this by peeking into the first document in the collection and get his set of keys
    keys=`mongo "$host/$dbname" -u $user -p $pass --eval "rs.slaveOk();var keys = []; for(var key in db.${collectionArray[$i]}.find().sort({_id: -1}).limit(1)[0]) { keys.push(key); }; keys;" --quiet`;
    # now use mongoexport with the set of keys to export the collection to csv
    mongoexport --host $host -u $user -p $pass -d $dbname -c ${collectionArray[$i]} --fields "$keys" --csv --out $dbname.${collectionArray[$i]}.csv;
done

IFS=$OIFS;

Answer 3

This working for me Try it

mongoexport --host cluster0-shard-dummy-link.mongodb.net:27017 --db yourdbname --forceTableScan   --collection users --type json --out /var/www/html/user.json --authenticationDatabase admin --ssl --username Yourusername --password Yourpassword

Above cmd return whole data of the users collection if you want filter field then add --fields=email,name

Answer 4

works for me remoting to a docker container with mongo:4.2.6

mongoexport -h mongodb:27017 --authenticationDatabase=admin -u username -p password -d database -c collection -q {"created_date": { "$gte": { "$date": "2020-08-03T00:00:00.000Z" }, "$lt": { "$date": "2020-08-09T23:59:59.999Z" } } } --fields=somefield1,somefield2 --type=csv --out=/archive.csv

Answer 5

Solution for MongoDB Atlas users!

Add the --fields parameter as comma separated field names enclosed in double inverted quotes:

--fields "<FIELD 1>,<FIELD 2>..."

This is complete example:

mongoexport --host Cluster0-shard-0/shard1URL.mongodb.net:27017,shard2URL.mongodb.net:27017,shard3URL.mongodb.net:27017 --ssl --username <USERNAME> --password <PASSWORD> --authenticationDatabase admin --db <DB NAME> --collection <COLLECTION NAME> --type <OUTPUT FILE TYPE> --out <OUTPUT FILE NAME> --fields "<FIELD 1>,<FIELD 2>..."

Answer 6

mongoexport  --help
....
-f [ --fields ] arg     comma separated list of field names e.g. -f name,age
--fieldFile arg         file with fields names - 1 per line

You have to manually specify it and if you think about it, it makes perfect sense. MongoDB is schemaless; CSV, on the other hand, has a fixed layout for columns. Without knowing what fields are used in different documents it's impossible to output the CSV dump.

If you have a fixed schema perhaps you could retrieve one document, harvest the field names from it with a script and pass it to mongoexport.