GET https://api.kleinanzeigen-agent.de/ads/v1/kleinanzeigen/categories

const apiKey = "IHR_API_SCHLÜSSEL";
const url = "https://api.kleinanzeigen-agent.de/ads/v1/kleinanzeigen/categories";

const response = await fetch(url, {
  headers: {
    "ads_key": apiKey,
    "Content-Type": "application/json"
  }
});

const data = await response.json();
console.log(data);

{
    "message": "Data fetched successfully",
    "success": true,
    "categories": [
        {
            "id": 48,
            "name": "Kleinanzeigen"
        },
        {
            "id": 49,
            "name": "Elektronik"
        },
        {
            "id": 189,
            "name": "Notebooks"
        },
        {
            "id": 110,
            "name": "Handy & Telefon"
        }
    ]
}