index-backup.js

const express = require('express')
const mongoose = require('mongoose')
const app = express()
const port = 3040

app.use(express.json())

//db configuration
mongoose.connect('mongodb://localhost:27017/nov-notes-app')
.then(() => {
    console.log("connected to db")
})
.catch((err) => {
    console.log(err)
})

//schema
const Schema = mongoose.Schema
const noteSchema = new Schema ( {
    title : {
        type : String,
        required : true
    },
    body : { 
        type : String
    }
})

//model
const Note = mongoose.model('Note',noteSchema)

//setup api
app.get('/notes',(req,res) => {

        Note.find()
        .then((notes) => { 
            res.json(notes)
        })
        .catch((err) => {
            res.json(err)
        })
})
app.post('/notes',(req,res) => {
    const body = req.body
    const note = new Note(body)
    note.save()
    .then((note) => {
        res.json(note)
    })
    .catch((err) => {
        res.json(err)
    })
})
app.get('/notes/:id', (req,res) => {
    const id = req.params.id
    Note.findById(id)
    .then((note) => {
        if(note){
            res.json(note)
        } else {
            res.json({})
        }
    })
    .catch((err) => {
        res.json(err)
    })
})
app.put('/notes/:id', (req,res) => {
    const id = req.params.id
    const body = req.body
    Note.findByIdAndUpdate(id, body, { new: true, runValidators: true})
    .then((note) => {
        res.json(note)
    })
    .catch((err) => {
        res.json(err)
    })
})

app.delete('/notes/:id', (req,res) => {
    const id = req.params.id
    Note.findByIdAndDelete(id)
        .then((note) => {
           if(note){
            res.json(note)
           } else {
            res.json({})
           }
        })
        .catch( (err) => {
            res.json(err)
        })
})

app.listen(port,() => {
    console.log('listening on port', port)
})