How to count the number of databases in mongod by mongo shell?

Question

I know how to list all databases in mongod. such as db.getMongo().getDBNames() show dbs. But how to count the number of databases?

Answer 1

You almost got it already

db.getMongo().getDBNames() returns a JavaScript array, so to get the length of it, just do:

db.getMongo().getDBNames().length