Mongodb needs some configuration to run. It needs to create this hierarchy /data/db/. Where can I find mongo files? and where do I create this directories?!
Run this command on your terminal:
sudo mongod --dbpath /var/lib/mongodb/
It will set the db path as well as start your mongodb server. You can then go to
verify your connection. You should get: "It looks like you are trying to access MongoDB over HTTP on the native driver port."