nodejs api not showing product for a particular product id

Question

I'm trying to create a basic nodejs API(No Framework)

My Folder Structure is

controllers
     productController.js
models
     productModels.js 
data
   products.js
node_modules
package.json
package-lock.json
server.js

I'm trying to send product data to the client associated with a particular product id. But the problem that I'm facing here is in the productModel.js file. Inside that file, I'm unable to filter out the particular product with an id. Once I use the id in the array.prototype.find() method as a conditional, it doesn't seem to recognize the value of the id. I wonder why?

products.js file

export const products =  [
    {
      "userId": 1,
      "id": 1,
      "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
      "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
    },
    {
      "userId": 1,
      "id": 2,
      "title": "qui est esse",
      "body": "est rerum tempore vitae\nsequi sint nihil reprehenderit dolor beatae ea dolores neque\nfugiat blanditiis voluptate porro vel nihil molestiae ut reiciendis\nqui aperiam non debitis possimus qui neque nisi nulla"
    },
    {
      "userId": 1,
      "id": 3,
      "title": "ea molestias quasi exercitationem repellat qui ipsa sit aut",
      "body": "et iusto sed quo iure\nvoluptatem occaecati omnis eligendi aut ad\nvoluptatem doloribus vel accusantium quis pariatur\nmolestiae porro eius odio et labore et velit aut"
    },
    {
      "userId": 1,
      "id": 4,
      "title": "eum et est occaecati",
      "body": "ullam et saepe reiciendis voluptatem adipisci\nsit amet autem assumenda provident rerum culpa\nquis hic commodi nesciunt rem tenetur doloremque ipsam iure\nquis sunt voluptatem rerum illo velit"
    }]

productController.js file

import {findAll, findById} from '../models/productModel.js'
export const getProduct = async (req, res, id) => {
    try{
        const product = await findById(id)

        if(!product){
            res.end(JSON.stringify({message: 'Prdouct not found'}))

        }else{
            res.writeHead(200, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify(product));
        }

    }catch(err){
        console.log(err)
    }
}

productModel.js file

import {products} from '../data/products.js'
export const findById = (id) => {
    const promise = new Promise((resolve, reject) => {       
        setTimeout(() => {
            console.log(id)
            const product = products.find(p => p.id === id)
            resolve(product)
            // reject('SERVER ERROR')
        }, 1000) 
    })
    return promise
}

server.js file

import http from 'http'
import { getProducts, getProduct } from './controllers/productControllers.js';

const server = http.createServer((req, res) => {
    if(req.url === '/api/products' && req.method === 'GET'){
        getProducts(req, res)
    }else if(req.url.match(/\/api\/products\/([0-9]+)/) && req.method === 'GET'){
        const id = req.url.split('/')[3]
        getProduct(req, res, id)
    }
    else{
        res.writeHead(200, { 'Content-Type': 'text/html' });
        res.end("Not found");
    }
});

const port = process.env.PORT || 8000
  
server.listen(port, () => {console.log(`Server running on port ${8000}`)});

Answer 1

Seems to be that you're comparing a string with a number. Therefore "1" === 1 // false.

Try converting the id from the path to an Int using parseInt() and then pass it to your function

const id = parseInt(req.url.split('/')[3], 10)

Answer 2

Your id you get from req.url.split('/')[3] is a string, but the product ids in your model are numbers. And you are comparing with === which will return false if the two operands have different types. Thus your comparison will always return false and you won't find a product. Use

const id = +(req.url.split('/')[3])

instead, which will make id a number.