app.js

const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
const { debugPort } = require('process');
const dboper = require('./operation');

const url = 'mongodb://localhost:27017/';
const dbname = 'complete_backend';

MongoClient.connect(url).then((client) => {

    console.log('Connected correctly to server');
    const db = client.db(dbname);

    dboper.insertDocument(db, { name: "Vadonut", description: "Test"},"dishes")
        .then((result) => {
            console.log("Insert Document:\n", result.ops);
            
            return dboper.findDocuments(db, "dishes");
        })
        .then((docs) => {
            console.log("Found Documents:\n", docs);

            return dboper.updateDocument(db, { name: "Vadonut" }, { description: "Updated Test" }, "dishes");

        })
        .then((result) => {
            console.log("Updated Document:\n", result.result);

            return dboper.findDocuments(db, "dishes");
        })
        .then((docs) => {
            console.log("Found Updated Documents:\n", docs);
                            
            return db.dropCollection("dishes");
        })
        .then((result) => {
            console.log("Dropped Collection: ", result);

            return client.close();
        })
        .catch((err) => console.log(err));

})
.catch((err) => console.log(err));