server.js

const http = require('http')
const {
     getProducts, 
     getProduct,
     createProduct, 
     updateProduct, 
     deleteProduct 
    } = require('./controllers/productController')

const PORT = process.env.PORT || 5000
const server = http.createServer((req, res) => {

    if (req.url === '/api/products' && req.method === 'GET') {
        getProducts(req, res)
    } else if (req.url.match(/\/api\/products\/\w+/) && req.method === 'GET') {
        const id = req.url.split('/')[3]
        getProduct(req, res, id)
    } else if (req.url === '/api/products' && req.method === 'POST') {
        createProduct(req, res)
    } else if (req.url.match(/\/api\/products\/\w+/) && req.method === 'PUT') {
        const id = req.url.split('/')[3]
        updateProduct(req, res, id)
    } else if (req.url.match(/\/api\/products\/\w+/) && req.method === 'DELETE') {
        const id = req.url.split('/')[3]
        deleteProduct(req, res, id)
    }else {
        res.writeHead(404, {'Content-Type' : 'application/json'})
        res.end(JSON.stringify({message : 'Route not found'}));
    }
})

server.listen(PORT, () => console.log(`listening on port ${PORT}`));