const express = require('express'); const mongoose = require('mongoose'); const bodyParser = require('body-parser'); const app = express(); var dbState = [ { value: 0, label: 'disconnected' }, { value: 1, label: 'connected' }, { value: 2, label: 'connecting' }, { value: 3, label: 'disconnecting' }, ]; mongoose.connect( 'mongodb://localhost:27017/firstdatabase', { useNewUrlParser: true }, () => { conststate = Number(mongoose.connection.readyState); console.log(dbState.find((f) => f.value == state).label, 'todb'); } );