VarunRaj-16/Inventory-and-Stock-Management-System ? reverse-engineered prompt

Build me a simple Python console app for inventory and stock management.

I want a menu driven tool where I can add products, update product details, remove items, and keep track of current stock levels. It should let me record stock going in and out, show what is low on stock, and generate a basic inventory report so I can see what I have at a glance. Please save everything in JSON so the data stays after I close the app, and make sure the app loads the saved data when it starts again.

Please add solid input validation so bad entries like empty names, negative quantities, or invalid choices do not break anything. Keep it easy to use from the terminal, with clear prompts and messages. If it helps, structure the code cleanly so it is easy to extend later, and make sure the whole thing runs smoothly from the command line.