I expect if that if mongo can parse a given `find` query, then mongoexport can parse that query too. Turns out that is not the case: mongoexport expects strict JSON input, with double quotes around all keys.

This works as expected:

mongo ${MONGO_URL} --quiet --eval "db.tweets.find({ _id: '...' })"

This fails with "Failed: error parsing query as Extended JSON: invalid JSON input":

mongoexport --uri=${MONGO_URL} -c tweets -q "{ _id: '...' }"

This makes it extra cumbersome to use mongoexport in shell scripts due to having to escape all the quotes.