curd with express

index.js

// const fs = require('fs');
const express = require('express');
const app = express();
const port = 3001
app.use(express.json());
const users = [{
    name:"john",
    kidney: [{
        healthy: false
    }]
}]

app.get('/', function (req,res) {
    const johnkidney = users[0].kidney;
    const numberOfKidneys = johnkidney.length;
    let noOfHealthyKidneys = 0;
    for (let i = 0; i < numberOfKidneys; i++) {
        if (johnkidney[i].healthy) {
            noOfHealthyKidneys++
        }
    }
    console.log(johnkidney);
    console.log(numberOfKidneys);
    console.log(noOfHealthyKidneys);
    // res.send('hello 123')
    res.json({
        noOfHealthyKidneys,
        numberOfKidneys,
        johnkidney
    })
})


app.post('/post', function (req,res) {
    const isHealthy = req.body.isHealthy;
    console.log(isHealthy);
    users[0].kidney.push({
        healthy: isHealthy
    });
    res.send('your data has been added')
})

app.put('/', function (req,res) {
    for (let i = 0; i < users[0].kidney.length; i++) {
        if (users[0].kidney[i].healthy) {
            users[0].kidney[i].healthy = false
        } else {
            users[0].kidney[i].healthy = true
        }
    }
    res.send('your data has been updated')
})



app.delete('/', function (req,res) {
    const newKeyneys = [];
    for (let i = 0; i < users[0].kidney.length; i++) {
        if (users[0].kidney[i].healthy) {
            newKeyneys.push(users[0].kidney[i])
        }
    }
    users[0].kidney = newKeyneys;

    res.json({message:'success'})
})
app.listen(port, () => console.log(`listening on port ${port}`))