To correctly use axios params with JavaScript arrays, we serialize them to a string.

For instance, we write

axios.get("/myController/myAction", {
  params: {
    storeIds: [1, 2, 3],
  },
  paramsSerializer: (params) => {
    return qs.stringify(params);
  },
});

to call get with the storeIds params.

We set the paramsSerializer property to a function that returns the stringified parameters we get from qs.stringify.

stringify converts the params object into a query string with all the parameters encoded.