query parameter does not working

[PradipDesigner]

i try many times this "http://localhost:3000/Products?q=mobile" but this not working so anyone pls help and my db.json file this "Products": [ { "productName": "Boat ", "price": "2999", "color": "black", "category": "watch", "description": "good watch for personal use", "productUrl": "https://images-na.ssl-images-amazon.com/images/I/418liDrUObL.SX320_QL100_AC_SCLZZZZZZZ.jpg", "id": "4169" }, { "id": "be25", "productName": "iphone 15", "price": "79999", "color": "white", "category": "mobile", "description": "good smart mobile", "productUrl": "https://m.media-amazon.com/images/W/MEDIAX_849526-T2/images/I/71PjpS59XLL.AC_SR360,240_QL70.jpg" }, { "productName": "samsung galaxy", "price": "2000", "color": "green", "category": "mobile", "description": "good mobile phone", "productUrl": "https://m.media-amazon.com/images/W/MEDIAX_849526-T2/images/I/818VqDSKpCL.AC_UY436_FMwebp_QL65.jpg", "id": "fe0b" } ]