Export your Mongo database. Each collection has it's own .json file. So, we can import them later using this script.

mongooo.sh

#!/bin/sh

exportDb() {
    echo "Exporting $1"
    echo "db.getCollectionNames()" |
        mongo $1 2> /dev/null |
        grep '"' |
        cut -d '"' -f 2 |
        while read a; do
            if [[ $a != "system.indexes" ]]; then
                mongoexport --db $1 --collection $a > $a.json;
            fi
        done
}

importDb() {
    ls -l |
        awk 'NF>2' |
        awk '{print $9}' |
        cut -d '.' -f 1 |
        while read b; do
            mongoimport --db $1 --collection $b --file $b.json ;
        done
}

usage() {
    echo "Usage: mongooo.sh [option] [dbName]

Option:
--export, -e   Export the [dbName]
--import, -i   Import the [dbName]
"
}

if [[ $2 == "" ]]; then
    usage;
    exit 1;
fi

case $1 in
    --export|-e) exportDb $2;;
    --import|-i) importDb $2;;
              *) usage && exit 1;;
esac