npm install body-parser, express, express-fileupload, xlsx

"To upload the file in the Rest Api"
Go to "http://localhost:3000/upload" and set the method to post

To get the data of products , go to "http://localhost:3000/products" and set the method to get

To get the data of product , go to "http://localhost:3000/products<product_code>" and set the method to get

To update the price of product , go to "http://localhost:3000/products<product_code>" and set the method to put
and add json object in body

To get the data of product from the updated file,go to "http://localhost:3000/products<product_code>" and set the method to get

To get all data of product from the updated file, go to "http://localhost:3000/products" and set the method to get