npm start [-- <args>]

This runs an arbitrary command specified in the package's "start" property of its "scripts" object\. If no "start" property is specified on the "scripts" object, it will run node server\.js\|\.

As of npm@2\.0\.0 https://blog\.npmjs\.org/post/98131109725/npm-2-0-0, you can use custom arguments when executing scripts\. Refer to npm help run-script for more details\.