mongo_db_exporter.sh

#!/bin/bash

# list and export all collections to json using mongoexport, from a specific mongo db
[ $# -ne 1 ] && echo "Usage: $0 <db-name>" && exit 1

DB=${1}

# fetch the list of all collections
COLLECTIONS=$(mongo localhost:27017/$DB --quiet --eval "db.getCollectionNames()" | grep \" | tr -d '\[\]\"[:space:]' | tr ',' ' ')

# create a folder for all the output (we don't want to litter cwd)
mkdir -p ${DB}

# loop through them, create the json output
for collection in ${COLLECTIONS}; do
    echo "Exporting ${DB}/${collection} ..."
    mongoexport -d ${DB} -c ${collection} -o ${DB}/${collection}.json
done


# Credits to: https://gist.github.com/thbkrkr/7617edf1f540a04f482a
# inspired from there.