Notes

const express = require('express')
const bodyParser = require('body-parser');
const cors = require('cors');

const app = express()
const port = 4200

//Get Post Put Delete

let products = [{
"id": "123456",
"Productname": "Lakme iconic Kajal",
"Product price": "800",
"Manufacturing date": "12-08-2021",
"Expiry date": "12-10-2023",
},
{ "id": "123457",
"Productname": "Mama earth Aloevera Gel",
"Product price": "1000",
"Manufacturing date": "10-09-2021",
"Expiry date": "11-10-2023",
},
{ "id": "123458",
"Productname": "Gilette Shaving Foam",
"Product price": "250",
"Manufacturing date": "09-12-2021",
"Expiry date": "15-01-2024",
}];

var allowCrossDomain = function(req,res,next){
res.header('Access-Control-Allow-Origin',"*"); //Postman
res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
res.header('Access-Control-Allow-Headers','Content-Type');
next();
}

app.use(cors());

app.use(express.urlencoded({extended:false}));
app.use(express.json());

//GET
app.get('/product',(req,res) => {
res.json(products);
});

//POST
app.post('/product',(req,res) => {
const product = req.body;
products.push(product);

res.send('Product is added to the database');
});

//PUT
app.put('/product/:id',(req,res) => {
//reading id from the URL
const id = req.params.id;
const newProduct = req.body;

//remove item from the products array
for(let i=0;i<products.length;i++){
let product = products[i]
if (product.id === id){
products[i] = newProduct;
}
}

//sending 404 when not found something is a good practice
res.send('Product is edited');
});

//DELETE
app.delete('/product/:id',(req,res) => {
//reading id from the URL
const id = req.params.id;

//remove item from the products array
products = products.filter(i => {
if (i.id !== id) {
return true;
}

return false;//if false delete the product
});

//sending 404 when not found something is a good practice
res.send('Product is deleted');
});

app.listen(port, () => console.log(`Hello world app listening on port ${port}!`));


//GET and check the presence of product in product array

app.get('/product/:id',(req,res) => {
//reading id from the url
const id = req.params.id;

// searching books for the id
for (let product of products){
if (product.id === id){
res.json(product);
return;
}
}

//sending 404 when not found something is a good practice
res.status(404).send('Product not found');
});