JAVASCRIPT

mongoose connection nodejs

const mongoose = require('mongoose');

const connectDB = async () => {
    mongoose
        .connect('mongodb://localhost:27017/playground', {
            useCreateIndex: true,
            useNewUrlParser: true,
            useUnifiedTopology: true,
            useFindAndModify: false
        })
        .then(() => console.log('Connected Successfully'))
        .catch((err) => console.error('Not Connected'));
}

module.exports = connectDB;

mongoose connection

const mongoose = require("mongoose");

//  database connection with mongoose
mongoose.connect("mongodb://localhost/todos", {
        useNewUrlParser: true,
        useUnifiedTopology: true
    })
    .then(() => console.log("connection successful"))
    .catch((err) => console.log(err));

create new connection in mongoose

const conn = mongoose.createConnection('mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[database][?options]]', options);