To use, just
npm install -g cofmon and then use
cofmon as you would the Mongo command.
'51bb660191888d7acc355ed8' compiles to
"51bb660191888d7acc355ed8" compiles to
Note that the quotes were reversed in a previous version. It was changed because the mongo repl returns object ids with double quotes, which meant you couldnt copy/paste the entire ID.