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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

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7 Answers 7

Reset to default
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

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1 Comment

for people coming across this in future, will be enabled by default in v4+, currently latest version if v6
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

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2 Comments

This issue is shown as fixed in driver version 3.3.5, so this should no-longer be a problem.
@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.
6

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.

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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 [email protected].

enter image description here

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This is fixed in version 2.3.1 Yay!
Great call-out. Some people may not think to check their dependencies
1

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; });
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-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));
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User wants to know about Native Mongo client
-1

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 })
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