getting the warning [current Server Discovery and Monitoring engine is deprecated] after using winston-mongodb

Question

after installing winston-mongodb I got the following warning :

(node:9316) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.

this is my app.js :

require('express-async-errors');

const express = require('express'),
    config = require('config'),
    morgan = require('morgan'),
    helmet = require('helmet'),
    winston = require('winston'),
    mongoose = require('mongoose');

require('winston-mongodb');


mongoose.connect("mongodb://localhost:27017/wsep",
    { useNewUrlParser: true, useFindAndModify: false, useCreateIndex: true, useUnifiedTopology: true })
    .then(connect => { console.log("connected to mongo db...") })
    .catch(error => { console.log("could not connect to mongo db ...") })

winston.add(new winston.transports.MongoDB({
    db: 'mongodb://localhost:27017/wsep'
}));

the warning above will be disappeared , if I remove/comment the following snippet code:

winston.add(new winston.transports.MongoDB({
    db: 'mongodb://localhost:27017/wsep'
}));

EDIT:

package.json

{
  "name": "backend-api",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "nodemon app.js",
    "start": "node app.js"
  },
  "engines": {
    "node": "13.5.0"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bcrypt-nodejs": "0.0.3",
    "compression": "^1.7.4",
    "config": "^3.2.5",
    "express": "^4.17.1",
    "express-async-errors": "^3.1.1",
    "helmet": "^3.21.2",
    "joi": "^14.3.1",
    "jsonwebtoken": "^8.5.1",
    "jwt-token-encrypt": "^1.0.4",
    "lodash": "^4.17.15",
    "mongoose": "^5.8.9",
    "multer": "^1.4.2",
    "winston": "^3.2.1",
    "winston-mongodb": "^5.0.1"
  },
  "devDependencies": {
    "nodemon": "^2.0.2"
  }
}

Answer 1

You can just add useUnifiedTopology: true to the options block of winston-mongodb like this:

winston.add(new winston.transports.MongoDB({
    db: 'mongodb://localhost:27017/wsep',
    options: {
        useUnifiedTopology: true,
    }
}));