i have a problem with cookies.I know that is problem in my json format data so when i use this style for product everything is ok

  {
        "id": 6,
        "name": "Product 6",
        "price": 120,
        "image": "images/6.webp",
        "category": "klima"
    }

but when i use something like this my cookies fail to load properly

{
        "id": 1,
        "name": "EcoPlus PULAR 12k WiFi Gree",
        "jacina": "12000",
        "image": "images/gree/pularimg/Pular1.jpg",
        "image1": "images/gree/pularimg/Pular2.jpg",
        "image2": "images/gree/pularimg/Pular3.jpg",
        "image3": "images/gree/pularimg/Pular4.jpg",
        "price": "50990",
        "proizvodjac": "Gree",
        "description": " <br>Kapacitet klima uredjaja: 12000BTU<br><br>Energetski razred:A++<br><br>Integrisan Wi-Fi modul<br>",
        "spec": "some speccccccc",
        "details": {

            "model": "PULAR 12K",
            "kapacitet": "12000",
            "klasa": "A+++/A+",
            "wifi": "DA",

            "karakteristike": {
                "hladjenje": "od 900 do 3600 (3200) W",
                "grejanje": "od 900 do 4000 (3400) W"
            },
            "kapacitetNaGrejanju": {
                "minus7": 3400,
                "minus10": 3000,
                "minus15": 2600
            },
            "seer": 6.10,
            "scop": "4,00 (srednja) 5,10 (topla)",
            "energetskaEfikasnost": {
                "hladjenje": "A++",
                "grejanje": "A+ (srednja zona) A+++ (topla zona)"
            },
            "opsegRadneTemperature": {
                "hladjenje": "od 18°C do + 43°C",
                "grejanje": "od -15°C do + 24°C"
            },
            "unutrasnjaJedinica": {
                "protokVazduha": "590 / 520 / 480 / 400 / 350 / 320 / 280",
                "buka": "24 / 26 / 30 / 33 / 35 / 37 / 41",
                "odvlazivanje": "1.4",
                "dimenzijeJedinice": "779 × 260 × 185",
                "dimenzijePakovanja": "823 × 316 × 247",
                "masa": "8 / 9,5"
            },
            "spoljasnjaJedinica": {
                "buka": "51",
                "kolicinaFreona": "0.55",
                "dimenzijeJedinice": "732 × 550 × 330",
                "dimenzijePakovanja": "789 × 600 × 373",
                "razmakNosaca": "455",
                "masa": "25 / 27,5"
            },
            "cevnaInstalacija": {
                "gasnaFaza": "ɸ9,52 (3/8")",
                "tecnaFaza": "ɸ6,35 (1/4")",
                "maxDuzinaVisina": "25 / 10",
                "minDuzina": "3",
                "dopunaFreonom": "12"
            },
            "elektricnaInstalacija": {
                "napajanje": "jednofazno",
                "ulaznaSnaga": {
                    "hladjenje": "50 ~ 1700",
                    "grejanje": "50 ~ 1700"
                },
                "jacinaStruje": {
                    "hladjenje": "0,5 ~ 7,5",
                    "grejanje": "0,5 ~ 7,5"
                },
                "tipNapojnogKabla": "3 x 1.5 mm²",
                "kablMedjuveze": "4 x 1.5 mm²"
            }
        },
        "category": ["klima", "klimaGree"]

    }

How can I change this to have proper data loaded from cookies? I store a cookie in listCart and when i inspect everything is ok with model 1 json but for model 2 just add first product which is clicked and all others are missing.I repete I know that is problem with formating json.

How can i fix this problem.Any advice?