index.js

let express = require("express");
let cors = require("cors"); 
let {MongoClient} = require("mongodb");
let app = express();
app.use(cors());
app.use(express.json());

// const url = "mongodb://0.0.0.0:27017"
const url ="mongodb+srv://omkarmahadik180:X6vzwwKmuKW5eoLm@cluster0.3dulmto.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0"

app.post("/add",(request,response)=>{
    let client = new MongoClient(url);
    client.connect();
    let db = client.db("mern");
    let collec = db.collection("bookings")
    let obj = {
        name: request.body.name,
        event: request.body.event,
        time: request.body.time,
        phone: request.body.phone
    }
    collec.insertOne(obj)
    .then((result)=>{
        response.send(result)
    })
    .catch((error)=>{
        response.send(error)
});
});

app.get("/get",(request,response)=>{
    let client = new MongoClient(url);
    client.connect();
    let db = client.db("mern");
    let collec = db.collection("bookings")

    collec.find({}).toArray()
    .then((result)=>{
        response.send(result)
    })
    .catch((error)=>{
        response.send(error)
});
});

app.listen(9000, () => {
  console.log("Express is Active");
});