http://pastebin.com/s2qvZz3h

the error is after starting making connections with database,within seconds,it closes automatically.with that my browser page contents which have to come from database doesnt come.

The thing is when i am starting nodemon app.js,then i opened the browser,the page contents which has to be come dynamicaly from database doesnt loaded in to that.
then i check my connection of mongod server,there i get to know connections are being made but suddenly it ends all the connections which he made.

Also the code is pasted in the link and  http://pastebin.com/PpCY4ajY   is ???
Please help.