Export Docker MongoDB collection as a JSON file

mongoDump.md

First, find the container that runs your MongoDB and ssh into it.

Then, find the collection you want to export:

mongo
show dbs
use <database>
show collections
exit

Then, run mongoexport command in the shell (not in mongo):

mongoexport -d <database-name> -c <collection-name> --out output.json

Then, on your local machine, copy the file from inside the docker container to your current folder:

docker cp <mongodb docker container name>:/output.json .

Don't forget the dot from the end.