{useNewUrlParser: true, useUnifiedTopology: true} what is the use of this in mongoose

Question

After Installing mongoose

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

What is the use of useNewUrlParser and useUnifiedToplogy ?

Answer 1

According to the documentation:

-->unifiedtopology : 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.

-->usenewurlparser : 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.