Warning on Connecting to MongoDB with a Node server
Check your mongo version
mongo --versionIf 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
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.
I got the same error and resolved using the below template.
var MongoClient = require('mongodb').MongoClientconst 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.