Server Discovery And Monitoring engine is deprecat

Question

I am using Mongoose with my Node.js app and this is my configuration:

mongoose.connect(process.env.MONGO_URI, {
   useNewUrlParser: true,
   useUnifiedTopology: true,
   useCreateIndex: true,
   useFindAndModify: false
}).then(()=>{
    console.log(`connection to database established`)
}).catch(err=>{
    console.log(`db error ${err.message}`);
    process.exit(-1)
})

but in the console it still gives me the warning:

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.

What is the problem? I was not using useUnifiedTopology before but now it shows up in the console. I added it to the config but it still gives me this warning, why? I do not even use MongoClient.

Edit

As Felipe Plets answered there was a problem in Mongoose and they fixed this bug in later versions. So you can solve problem by updating mongoose version.

Answer 1

This works for me!

const url = 'mongodb://localhost:27017/db_name';
mongoose.connect(
    url, 
    { 
        useNewUrlParser: true, 
        useUnifiedTopology: true,
        useCreateIndex: true
    }
)

This will solve three DeprecationWarning

1. Current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
2. 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.
3. Collection.ensureIndex is deprecated. Use createIndexes instead.

Hope it helps.

Answer 2

This worked for me

For folks using MongoClient try this:

MongoClient.connect(connectionurl, 
  {useUnifiedTopology: true, useNewUrlParser: true},  callback() {

For mongoose:

mongoose.connect(connectionurl, 
         {useUnifiedTopology: true, useNewUrlParser: true}).then(()=>{

Remove other connectionOptions

Answer 3

I was also facing the same issue:

1. I made sure to be connected to mongoDB by running the following on the terminal:

   brew services start mongodb-community@4.2
   

   And I got the output:

   Successfully started `mongodb-community`
   

Instructions for installing mongodb at
https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/ or https://www.youtube.com/watch?v=IGIcrMTtjoU

2. My configuration was as follows:

   mongoose.connect(config.mongo_uri, {
       useUnifiedTopology: true,
       useNewUrlParser: true})
       .then(() => console.log("Connected to Database"))
       .catch(err => console.error("An error has occured", err));
   

Which solved my problem!

Answer 4

In mongoDB, they deprecated current server and engine monitoring package, so you need to use new server and engine monitoring package. So you just use

{ useUnifiedTopology:true }

mongoose.connect("paste db link", {useUnifiedTopology: true, useNewUrlParser: true, useCreateIndex: true });

Answer 5

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.