Development-only error handler middleware
$ npm install errorhandlervarerrorhandler=require('errorhandler')Create new middleware to handle errors and respond with content negotiation. This middleware is only intended to be used in a development environment, as the full error stack traces will be sent back to the client when an error occurs.
varconnect=require('connect')varerrorhandler=require('errorhandler')varapp=connect()if(process.env.NODE_ENV==='development'){// only use in developmentapp.use(errorhandler())}