'use strict'; var Realm = require('realm'); let winstonRealm = new Realm({ path: 'winston.realm' }); // Register listener to print out log messages at error level winstonRealm.objects('Log').filtered('level = "error"').addListener((logs, changes) => { changes.insertions.map((index) => { let log = logs[index]; console.log(log.message); }) });