Node.js 6.6.0 added a sporadically useful bug/feature: logging unhandled promise rejections to the console by default. In other words, the below script will print an error to the console: Promise.reject(new Error('woops')); /* Output: $ node test.js (node:7741) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: woops (node:7741) DeprecationWarning: Unhandled pr