mongodb4.js

//Delete one or Delete many
const { MongoClient, ObjectID } = require('mongodb');

const connectionURL = 'mongodb://127.0.0.1:27017';
const databaseName = 'task-manager';

MongoClient.connect(
  connectionURL,
  { useNewUrlParser: true, useUnifiedTopology: true },
  (error, client) => {
    if (error) {
      return console.log('Unable to connect to database');
    }

    const db = client.db(databaseName); //Give reference to the specific database you want to manipulate
    db.collection('users')
      .deleteMany({
        age: 20,
      })
      .then((result) => {
        console.log(result);
      })
      .catch((error) => {
        console.log(error);
      });

    db.collection('new tasks')
      .deleteMany({
        description: 'pehla',
      })
      .then((res) => {
        console.log(res);
      })
      .catch((err) => {
        console.log(err);
      });
  }
);