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     useUnifiedTopology  true     useCreateIndex  true     useFindAndModify  false    then     gt       console log  connection to database established      catch err  gt       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

User · Answer

It is simple   remove the code that you have used and use the below code   const url    mongodb   localhost 27017   var dbConn   mongodb MongoClient connect url   useUnifiedTopology  true

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Update  Mongoose 5 7 1 was release and seems to fix the issue  so setting up the useUnifiedTopology option work as expected    mongoose connect mongoConnectionString   useNewUrlParser  true  useUnifiedTopology  true      Original answer  I was facing the same issue and decided to deep dive on Mongoose code  https   github com Automattic mongoose search q useUnifiedTopology amp unscoped q useUnifiedTopology  Seems to be an option added on version 5 7 of Mongoose and not well documented yet  I could not even find it mentioned in the library history https   github com Automattic mongoose blob master History md  According to a comment in the code           param  Boolean   options useUnifiedTopology false  False by default  Set to true to opt in to the MongoDB driver s replica set and sharded cluster monitoring engine       There is also an issue on the project GitHub about this error  https   github com Automattic mongoose issues 8156  In my case I don t use Mongoose in a replica set or sharded cluster and though the option should be false  But if false it complains the setting should be true  Once is true it still don t work  probably because my database does not run on a replica set or sharded cluster    I ve downgraded to 5 6 13 and my project is back working fine  So the only option I see for now is to downgrade it and wait for the fix to update for a newer version

User · Answer

This works fine for me  and no more errors  mongoose  connect URL of mongodb    useUnifiedTopology  true  useNewUrlParser  true      then      gt  console log  DB Connected      catch err   gt    console log  DB Connection Error    err

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It is important to run your mongod command and keep the server running  If not  you will still be seeing this error  I attach you my code   x000D   x000D  const mongodb   require  mongodb   const MongoClient   mongodb MongoClient  const connectionURL    mongodb   127 0 0 1 27017  const databaseName    task-manager   MongoClient connect connectionURL   useNewUrlParser  true  useUnifiedTopology  true    error  client    gt        if error            return console log  Error connecting to the server               console log  Succesfully connected       x000D   x000D   x000D

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const mongo   require  mongodb   MongoClient      mongo connect process env DATABASE  useUnifiedTopology  true      useNewUrlParser  true    err  db    gt          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       gt          console log  Listening on port     process env PORT

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Add the useUnifiedTopology option and set it to true   Set other 3 configuration of the mongoose connect options which will deal with other remaining DeprecationWarning   This configuration works for me    const url    mongodb   localhost 27017 db name   mongoose connect      url                  useNewUrlParser  true           useUnifiedTopology  true          useCreateIndex  true          useFindAndModify  false           This will solve 4 DeprecationWarning    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  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  Collection ensureIndex is deprecated  Use createIndexes instead  DeprecationWarning  Mongoose  findOneAndUpdate   and findOneAndDelete   without the useFindAndModify option set to false are deprecated  See  https   mongoosejs com docs deprecations html -findandmodify-    Hope it helps

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Setting mongoose connect useUnifiedTopology  true option      import mongoose from  mongoose            const server    127 0 0 1 27017      REPLACE WITH YOUR DB SERVER         const database    DBName      REPLACE WITH YOUR DB NAME         class Database             constructor                 this  connect                           connect                 mongoose Promise   global Promise                   Local DB SERVER               mongoose                connect  mongodb     server    database                      useNewUrlParser  true                  useCreateIndex  true                  useUnifiedTopology  true                                 then                       gt  console log  mongoose version    mongoose version                     console log  Database connection successful                                   catch err   gt  console error  Database connection error   err                                     module exports   new Database

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This solved my problem    const url    mongodb   localhost 27017     const client   new MongoClient url   useUnifiedTopology  true

User · Answer

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

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const url    mongodb   localhost 27017   const client   new MongoClient url    Cut the upper 2nd line then Just Replace that s line const client   new MongoClient url    useUnifiedTopology  true

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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    gt            return new Promise  resolve  reject    gt                crypto randomBytes 16   err  buf    gt                    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

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This will work     Connect to Mongo mongoose set  quot useNewUrlParser quot   true   mongoose set  quot useUnifiedTopology quot   true    mongoose    connect db     Connection String here    then      gt  console log  quot MongoDB Connected    quot       catch      gt  console log err

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mongoose connect  quot DBURL quot    useUnifiedTopology  true  useNewUrlParser  true  useCreateIndex  true    err   gt       if  err            console log  MongoDB connection sucess                  else           console log  connection not established      JSON stringify err undefined 2

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I was also facing the same issue    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   My configuration was as follows   mongoose connect config mongo uri        useUnifiedTopology  true      useNewUrlParser  true        then      gt  console log  Connected to Database         catch err   gt  console error  An error has occured   err       Which solved my problem

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You Can Try async await   x000D   x000D  const connectDB   async      gt    x000D      try   x000D          await mongoose connect  lt database url gt     x000D              useNewUrlParser  true  x000D              useCreateIndex  true  x000D              useUnifiedTopology  true  x000D              useFindAndModify  false x000D              x000D          console log  MongoDB Conected   x000D        catch  err    x000D          console error err message   x000D          process exit 1   x000D        x000D     x000D   x000D   x000D

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i had the same errors popping up each time and this worked for me   mongoose connect  mongodb   localhost 27017   yourDB          useNewUrlParser  true      useUnifiedTopology  true     function  err        if  err            console log err        else           console log  Database connection successful

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If you are using a MongoDB server then after using connect in the cluster clock on connect and finding the URL  the URL will be somehing like this   lt mongodb srv   Rohan  lt password gt  cluster0-3kcv6 mongodb net  lt dbname gt  retryWrites true amp w majority gt    In this case  don t forget to replace the password with your database password and db name and then use  const client   new MongoClient url  useUnifiedTopology true

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const mongoose   require  mongoose     mongoose connect  mongodb   localhost 27017 Edureka    useNewUrlParser  true  useUnifiedTopology  true     error   gt        const connectionStatus    error    Success    Error Connecting to database       console log connectionStatus

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working sample code for mongo  reference link  var MongoClient   require  mongodb   MongoClient  var url    quot mongodb   localhost 27017  quot   MongoClient connect url   useUnifiedTopology  true    function err  db      if  err  throw err    var dbo   db db  quot mydb quot      dbo createCollection  quot customers quot   function err  res        if  err  throw err      console log  quot Collection created  quot        db close

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Use the following code to avoid that error MongoClient connect connectionString   useNewUrlParser  true  useUnifiedTopology  true

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if  you used typescript add config to the MongoOptions const MongoOptions  MongoClientOptions       useNewUrlParser  true    useUnifiedTopology  true            const client   await MongoClient connect url  MongoOptions    if you not used typescript   const MongoOptions      useNewUrlParser  true    useUnifiedTopology  true

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use this line  this worked for me  mongoose set  useUnifiedTopology   true

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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     gt     Remove other connectionOptions

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mongoose connect  mongodb   localhost 27017 Tododb     useNewUrlParser  true  useUnifiedTopology  true       Will remove following errors -   node 7481  DeprecationWarning  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    node 7481  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

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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

[node.js] Server Discovery And Monitoring engine is deprecated

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