app.js

const express = require('express');
const connectDB = require("./db");
const Product = require('./product');
const cors = require('cors');

const app = express();
app.use(express.json());
app.use(cors());

connectDB();

app.get('/products', async (req,res)=>{
    try {
        const products = await Product.find();
        res.json(products);
    }
    catch (error){
        res.status(500).send(error.message);
    }
})

app.get('/products/:id', async (req,res)=>{
    try {
        const product = await Product.findById(req.params.id);
        if (!product) throw new Error('Product not found');
        res.json(product);
    }
    catch (error){
        res.status(500).send(error.message);
    }
});


app.post('/products', async (req,res)=>{
    try {
        const {name, price, quantity} = req.body;
        const product = new Product({name, price, quantity});
        await product.save();
        res.json({success:true});
    }
    catch (error){
        res.status(500).send(error.message);
    }
});

app.put('/products/:id', async (req,res)=>{
    try {
        const product = await Product.findByIdAndUpdate(req.params.id, req.body, {new:true});
        if (!product) throw new Error('Product not found');
        res.json({success:true});
    }
    catch (error){
        res.status(500).send(error.message);
    }
});

app.delete('/products/:id', async (req,res)=>{
    try {
        const product = await Product.findByIdAndDelete(req.params.id);
        if (!product) throw new Error('Product not found');
        res.json({success:true});
    }
    catch (error){
        res.status(500).send(error.message);
    }
});

const port = 5000;

app.listen(port, ()=>{
    console.log("API server started on port 5000");
})