Connection of MongoDB live server with express JS with example

mongodb.js

import { MongoClient } from 'mongodb'

const uri = process.env.MONGODB_URI
const options = {
  useUnifiedTopology: true,
  useNewUrlParser: true,
}

let client
let clientPromise

if (!process.env.MONGODB_URI) {
  throw new Error('Add Mongo URI to .env.local')
}
client = new MongoClient(uri, options)
clientPromise = client.connect()
export default clientPromise

import the clientPromise

const client= await clientPromise;
const db=client.db("blog");
const users = await db.collection("users").find({email:body.email}).toArray();