Lab-Importing a Dataset

While i am executing mongoimport command, i got this error…

It failed to connect to your DB

Is mongod up and running?
Are you able to connect to db with that user you are trying to import?

Before i forgot to start mongod…Now i did but still this error

Actually i wrote mongod command wrong…after running mongod configuration file and made some corrections in mongoimport command…I am able to import json files to specified database successfully in another window and thank you for your help…