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i will send array data using formData. the backend accepts the data array with a dash ; example if in postman using form-data like this:

id_barang : 122;288;383 (send 3 value id with dash ;)

if i use formData is it like this?

  data [
       {
          id_barang : 122
       },
       {
          id_barang : 288
       },
       {
          id_barang : 383
       }
    ]
    
     let barang = data.map(x => x.id_barang).join(";");
     const f = new FormData();
     f.append("id_barang", barang);


     //please correct me if i'm wrong

my backend

    id_barang_data := strings.Split(r.FormValue("id_barang"), ";") // => 1002;983;756
    
    for i, _ := range id_barang_data { // loop through the files one by one
            rSegAnalisaMethodDetail := models.SegAnalisaMethodDetail{}
            id_barang, err := strconv.Atoi(id_barang_data[i])
            if err != nil {
                responses.ERROR(w, http.StatusBadGateway, err)
            }

Answers

There is nothing wrong with your code. the only thing missing here is that you didn't provide a way of sending your request with axios. when you use FormData with axios you need to add 'Content-Type': 'multipart/form-data'. however if you don't add any files to Formdata then there is no need to use Formdata

Here is the compete action:

var banyakBarang = [
    { id_barang: 122 },
    { id_barang: 288 },
    { id_barang: 383 }
];

var barangString = banyakBarang.map(function(barang) {
    return barang.id_barang;
}).join(';');

var formData = new FormData();
formData.append('id_barang', barangString);

axios({
    method: 'post',
    url: '/x',
    data: formData,
    headers: {
        'Content-Type': 'multipart/form-data'
    },
});

Request Payload:

id_barang: 122;288;383