How to get a specific item from JSON?

I have a collection in a JSON file, when I access it by http://localhost:5000/product/ I see it, but when I try to get a specific product from it, like http://localhost:5000/product/1 I see nothing but [], what could be a possible solution to this?

I expect the output of http://localhost:5000/product/1 to be { "Id": 1, "name": "Milk", "Quantity": 100, "Unit_coast": 2000 }





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