Warning on Connecting to MongoDB with a Node server

Question

Connecting with MongoDB native driver

I wrote following code to connect mongodb through native driver which has been install with npm install mongodb --save

const MongoClient = require("mongodb").MongoClient;
const url = "mongodb://127.0.0.1:27017";

const dbName = "game-of-thrones";
let db;

MongoClient.connect(
url,
 { useNewUrlParser: true },
  (err, client) => {
    if (err) return console.log(err);

  db = client.db(dbName);
   console.log(`Connected MongoDB: ${url}`);
   console.log(`Database: ${dbName}`);
  }
);

When I write on the terminal node server.js I got following error

(node:3500) 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 MongoClient.connect. Connected MongoDB: mongodb://127.0.0.1:27017 Database: game-of-thrones

The database is connected, but how can I get rid out from the warning

score 92 · Accepted Answer · edited Aug 28 '19 at 13:58

92

Check your mongo version

 mongo --version

If you are using version >= 3.1.0 change you mongo connection file to ->

 MongoClient.connect("mongodb://localhost:27017/YourDB", {
   useNewUrlParser: true,
   useUnifiedTopology: true
 })

For details about the useUnifiedTopology option added in 3.2.1, see https://github.com/mongodb/node-mongodb-native/releases/tag/v3.2.1

edited Aug 28 '19 at 13:58

Thomas Ebert

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answered Aug 18 '19 at 17:51

Bivin Vinod

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for people coming across this in future, will be enabled by default in v4+, currently latest version if v6 – Yash Kumar Verma Sep 10 '22 at 17:03

score 10 · Answer 2 · edited Oct 21 '19 at 14:45

10

My advice is to leave it as it is (maybe place a warning). The useUnifiedTopology: true option does not work correctly.

More precisely, in the event of a loss of connection to the DBMS, it will never be restored. Current version 3.3.3 does not solve this problem.

Check this

edited Oct 21 '19 at 14:45

tomRedox

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answered Oct 21 '19 at 12:10

Siarhei Dudko

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This issue is shown as fixed in driver version 3.3.5, so this should no-longer be a problem. – davidm_uk Mar 09 '20 at 12:19
3

@davidm_uk can confirm, answer is no longer relevant. Won't down-vote because it was both relevant and correct at the time of its posting. – Native Coder Sep 10 '20 at 16:32

score 6 · Answer 3 · answered Dec 17 '19 at 07:18

I got the same error and resolved using the below template.

var MongoClient = require('mongodb').MongoClient

const client = new MongoClient(uri, {useUnifiedTopology: true});

client.connect().then((client)=>{
    var db = client.db('db_name')
    db.collection('collection_name').find().toArray(function (err, result) {
        if (err) throw err
        console.log(result);
    })
})

This worked for me. and now it's not showing any DepricationWarning.

Steven Ventimiglia · Answer 4 · 2020-02-17T06:07:30.733

3

I want to add to this thread that it may also have to do with other dependencies.

For instance, nothing I updated or set for NodeJS, MongoDB or Mongoose were the issue - however - connect-mongodb-session had been updated and starting slinging the same error. The solution, in this case, was to simply rollback the version of connect-mongodb-session from version 2.3.0 to 2.2.0.

UPDATE: The issue is now fixed in connect-mongodb-session@2.3.1.

edited Feb 17 '20 at 06:07

answered Feb 07 '20 at 00:15

Steven Ventimiglia

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This is fixed in version 2.3.1 Yay! – Greg Feb 16 '20 at 18:50
1

Great call-out. Some people may not think to check their dependencies – Native Coder Sep 10 '20 at 16:37

score 1 · Answer 5 · answered May 19 '21 at 15:36

This is what made it work for me.

MongoClient.connect('mongodb://localhost:27017/blogdb', {useUnifiedTopology: true} , (err, client) =>
{
  if (err) throw err;
  const db = client.db('blogdb');
  const collection = db.collection('posts');
  const users = db.collection('users');
  app.locals.collection = collection;
  app.locals.users = users;

});

This is the same exact code I had before where I was getting the same deprecation message. The only difference is I haven't added the 'useUnifiedTopology: true' line.

MongoClient.connect('mongodb://localhost:27017/blogdb', (err, client) =>
{
  if (err) throw err;
  const db = client.db('blogdb');
  const collection = db.collection('posts');
  const users = db.collection('users');
  app.locals.collection = collection;
  app.locals.users = users;

});

score 0 · Answer 6 · edited Oct 13 '21 at 02:50

0

yeah i got the same issue , the database was connected successfully but i used to face with warning message of deprecating warning. here are some short tips i used to handle it i hope it will help you

mongoose.connect(
  database,
  {useUnifiedTopology: true, useNewUrlParser: true, useCreateIndex: true })

edited Oct 13 '21 at 02:50

bguiz

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answered Oct 12 '21 at 18:37

Yves Travel

1

This does not really answer the question. If you have a different question, you can ask it by clicking [Ask Question](https://stackoverflow.com/questions/ask). To get notified when this question gets new answers, you can [follow this question](https://meta.stackexchange.com/q/345661). Once you have enough [reputation](https://stackoverflow.com/help/whats-reputation), you can also [add a bounty](https://stackoverflow.com/help/privileges/set-bounties) to draw more attention to this question. - [From Review](/review/late-answers/30061395) – Bae Oct 13 '21 at 03:46

score -1 · Answer 7 · edited Jan 05 '20 at 08:55

-1

Replace yourdbname with your variable or just link of your mongodb..

 mongoose.connect(yourdbname, {useUnifiedTopology: true, useNewUrlParser: true, useCreateIndex: true })
  .then(console.log("mongodb connected successfully...."))
  .catch(err =>console.log(err));

edited Jan 05 '20 at 08:55

RamPrakash

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answered Jan 05 '20 at 03:20

Subhash Chaudhary

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User wants to know about Native Mongo client – PrestonDocks Aug 02 '20 at 21:01

Warning on Connecting to MongoDB with a Node server

Connecting with MongoDB native driver

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