index.js

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

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

// mongodb
const uri = `mongodb+srv://${process.env.DB_USER}:${process.env.DB_PASS}@cluster0.xwj8y.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 collection = client.db("test").collection("devices");

    }
    finally {

    }
}
run().catch(console.dir);


app.get("/", (req, res) => {
    res.send("Ema-john server running");
});

app.listen(port, () => {
    console.log("Listening port", port);
});