Get all MongoDB database names and collections names for each, using mongo binary and jq

mongo-dbs-collections.sh

dbs=$(
  mongo --quiet --eval "db.adminCommand('listDatabases')" |
  jq ".databases[].name|select((.!=\"admin\") and (.!=\"config\") and (.!=\"local\"))" |
  sed "s/\"//g"
)
for db in $dbs
do
  collections=$(
    mongo $db --quiet --eval 'db.getCollectionNames()' |
    jq .[] |
    sed "s/\"//g"
  )
  for collection in $collections
  do
    echo $db - $collection
  done
done