Server Discovery And Monitoring engine is deprecated

Question

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

mongoose.connect(process.env.MONGO_URI, {
   useNewUrlParser: true,
   useUnifiedTopol         


        

Answer 1

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 2

If your code includes createConnetion for some reason (In my case I'm using GridFsStorage), try adding the following to your code:

    options: {
        useUnifiedTopology: true,
    }

just after file, like this:

    const storage = new GridFsStorage({
    url: mongodbUrl,
    file: (req, file) => {
        return new Promise((resolve, reject) => {
            crypto.randomBytes(16, (err, buf) => {
                if (err) {
                    return reject(err);
                }
                const filename = buf.toString('hex') + path.extname(file.originalname);
                const fileInfo = {
                    filename: filename,
                    bucketName: 'uploads'
                };
                resolve(fileInfo);
            });
        });
    },
    options: {
        useUnifiedTopology: true,
    }
})

If your case looks like mine, this will surely solve your issue. Regards

Answer 3

   const mongo = require('mongodb').MongoClient;

   mongo.connect(process.env.DATABASE,{useUnifiedTopology: true, 
   useNewUrlParser: true}, (err, db) => {
      if(err) {
    console.log('Database error: ' + err);
   } else {
    console.log('Successful database connection');
      auth(app, db)
      routes(app, db)

   app.listen(process.env.PORT || 3000, () => {
      console.log("Listening on port " + process.env.PORT);
    });  

}});

Answer 4

Use the following code to avoid that error

MongoClient.connect(connectionString, {useNewUrlParser: true, useUnifiedTopology: true});

Answer 5

use this line, this worked for me

mongoose.set('useUnifiedTopology', true);

Answer 6

This solved my problem.

 const url = 'mongodb://localhost:27017';

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