index.js

const express = require('express');
const cors = require('cors');
const { MongoClient, ServerApiVersion } = require('mongodb');
const { query } = require('express');
require('dotenv').config();
const port = process.env.PORT || 5000;
const app = express();

//Middleware
app.use(cors());
app.use(express.json());

const uri = `mongodb+srv://${process.env.DB_USER}:${process.env.DB_PASS}@cluster0.4thvw.mongodb.net/myFirstDatabase?retryWrites=true&w=majority`;
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true, serverApi: ServerApiVersion.v1 });

async function run(){
    try{
        await client.connect();
        const productCollection = client.db('emajohn').collection('products');

        app.get('/products', async(req, res) => {
            console.log('query', req.query);
            const page = parseInt(req.query.page);
            const size = parseInt(req.query.size);

            const query = {};
            const cursor = productCollection.find(query);
            let products;
            if(page || size){
                 products = await cursor.skip(page*size).limit(size).toArray();
            }
            else{
                 products = await cursor.toArray();
            }
            
            res.send(products); 
        });

        app.get('/productCount', async(req, res) => {
            const count = await productCollection.estimatedDocumentCount();
            res.send({count});
        })

    }
    finally{

    }
}

run().catch(console.dir);



app.get('/', (req, res) => {
    res.send('Ema John is Running')
});

app.listen(port, () => {
    console.log('Ema John is again Running');
});