API.js

var logger = new (winston.Logger)({
  transports: [
    new (winston.transports.File)({ filename: 'error.log', level: 'error', handleExceptions: true}),
    new (winston.transports.File)({ filename: 'info.log', level: 'info'}),
    new (winston.transports.File)({ filename: 'logs.log'}),
    new (winston.transports.Console)({ colorize: true })
  ]
});