react axios cannot read token code example

Example: get token from post axios react

const refreshToken = () => {  let currUser = JSON.parse(localStorage.getItem("my_app_user"));  let getUserFormData = new FormData();  getUserFormData.append("grant_type", "refresh_token");  getUserFormData.append("refresh_token", currUser.refresh_token);  return new Promise((resolve, reject) => {    my_app    .post(`${URL}/token/url/`, getUserFormData, {      headers: {        Authorization: "Basic {secret_key}"      }    })    .then(async response => {      resolve(response);    })    .catch(error => {      reject(error);    });  });};