How to connect MongoDB Compass locally?

 const uri = "mongodb://127.0.0.1:27017";

Just use the above code in your nodejs (express) file.

For Example:

const express = require('express');

const app = express();

const cors = require('cors');

require('dotenv').config();

const nodemailer = require("nodemailer");

const port = process.env.PORT || 5000;

app.use(cors())

app.use(express.json());

const { MongoClient, ServerApiVersion, ObjectId } = require('mongodb');

// const uri = `mongodb+srv://${process.env.MONGO_USER}:${process.env.MONGO_PASS}@cluster0.h7sw1.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0`;

const uri = "mongodb://127.0.0.1:27017";

// Create a MongoClient with a MongoClientOptions object to set the Stable API version

const client = new MongoClient(uri, {

    serverApi: {

        version: ServerApiVersion.v1,

        strict: true,

        deprecationErrors: true,

    }

});

async function run() {

    try {

        // Connect the client to the server (optional starting in v4.7)

        await client.connect();

        // Send a ping to confirm a successful connection

        // your code here

}