improve

routes/products.js

@@ -41,7 +41,7 @@ router.get('/products', async (req, res) => {
 
 router.get('/products/:id', async (req, res) => {
   try {
-    let product = await Product.findOne( { _id: req.param.id })
+    let product = await Product.findOne( { _id: req.params.id })
     res.json({
       success: true,
       product