fosrestbundle and jmsserializerbundle give me back a very long json

Hi, I am using symfony 3.3.15 to build a project that includes an API, and I am using fosrestbundle and jmsserializerbundle in which I have two entities, one ad and another category related to one and many, and when I consult the api for the ads returns me the ads and an arrangement with all the data of the category and I just need your id and the same way when I ask for the categories returns me a json with the categories and in a subarrange all ads that belong to the category and equally I just need your id here I send you an example

[
    {
        "id": 2,
        "titulo": "Venta de monitor",
        "descripccion": "ssasas",
        "precio": 80,
        "nombre": "JJJJJ",
        "telefono": "XXXXXXX",
        "auto": false,
        "categoria": {
            "id": 3,
            "nombre": "Computadoras",
            "slug": "computadoras",
            "anuncios": [
                {
                    "id": 4,
                    "titulo": "Vendo SmarTV",
                    "descripccion": "wefwef",
                    "precio": 120,
                    "nombre": "JJJJ",
                    "telefono": "XXXXXXX",
                    "auto": false,
                    "slug": "vendo-smartv",
                    "created": "2018-01-22T23:48:37+0100",
                    "updated": "2018-01-22T23:48:37+0100",
                    "image_name": "132124646_1GG.jpg",
                    "image1_name": "132124646_3GG.jpg"
                }
            ]
        },
        "slug": "xxxxx",
        "created": "2018-01-22T21:26:55+0100",
        "updated": "2018-01-22T21:40:43+0100",
        "image_name": "25UM58_7_170914.jpg"
    },
    {
        "id": 3,
        "titulo": "Vendo Casa",
        "descripccion": "Casa frente al mar",
        "precio": 15000,
        "nombre": "JJJJJ",
        "telefono": "XXXXXXX",
        "auto": false,
        "categoria": {
            "id": 1,
            "nombre": "Vivienda",
            "slug": "vivienda",
            "anuncios": []
        },
        "slug": "vendo-casa",
        "created": "2018-01-22T21:40:28+0100",
        "updated": "2018-01-22T21:40:28+0100"
    },
    {
        "id": 4,
        "titulo": "Vendo SmarTV",
        "descripccion": "wefwef",
        "precio": 120,
        "nombre": "JJJJJ",
        "telefono": "XXXXXX",
        "auto": false,
        "categoria": {
            "id": 3,
            "nombre": "Computadoras",
            "slug": "computadoras",
            "anuncios": [
                {
                    "id": 2,
                    "titulo": "Venta de monitor",
                    "descripccion": "ssasas",
                    "precio": 80,
                    "nombre": "JJJJJ",
                    "telefono": "XXXXXX",
                    "auto": false,
                    "slug": "xxxxx",
                    "created": "2018-01-22T21:26:55+0100",
                    "updated": "2018-01-22T21:40:43+0100",
                    "image_name": "25UM58_7_170914.jpg"
                }
            ]
        },
        "slug": "vendo-smartv",
        "created": "2018-01-22T23:48:37+0100",
        "updated": "2018-01-22T23:48:37+0100",
        "image_name": "132124646_1GG.jpg",
        "image1_name": "132124646_3GG.jpg"
    }
]

How can I solve this?

Greetings