how to connect local mongoDb to node

                                    // create folder config and create two files below mentioned...

// default.json 
{
  "mongoURI": "add_your_key =_here"
}

/// db.js
const mongoose = require("mongoose");
const config = require("config");
const db = config.get("mongoURI");

const connectDB = async () => {
  try {
    await mongoose.connect(db, {
      useNewUrlParser: true,
      useCreateIndex: true,
      useFindAndModify: false,
    });
    console.log("MongoDB connected...");
  } catch (err) {
    console.log(err.message);
    process.exit(1);
  }
};

# DONE ✅

// dependencies
  npm i express bcryptjs jsonwebtoken config express-validator mongoose

// dev-dependencies
  npm i -D nodemon concurrently

                                    async function main(){
    /**
     * Connection URI. Update <username>, <password>, and <your-cluster-url> to reflect your cluster.
     * See https://docs.mongodb.com/ecosystem/drivers/node/ for more details
     */
    const uri = "mongodb+srv://<username>:<password>@<your-cluster-url>/test?retryWrites=true&w=majority";
 

    const client = new MongoClient(uri);
 
    try {
        // Connect to the MongoDB cluster
        await client.connect();
 
        // Make the appropriate DB calls
        await  listDatabases(client);
 
    } catch (e) {
        console.error(e);
    } finally {
        await client.close();
    }
}

main().catch(console.error);