why we should use interceptors for axios code example

Example 1: axios.interceptors.response.use

// Add a response interceptor
HTTP.interceptors.response.use(function (response) {
 return response
}, function(error) {
 if (error.response.status === 401) {
  store.dispatch('logout')
  router.push('/login')
 }
 return Promise.reject(error.response.data)
})

Example 2: axios request interceptor

// Add a request interceptor
axios.interceptors.request.use(function (config) {
    // Do something before request is sent
    return config;
  }, function (error) {
    // Do something with request error
    return Promise.reject(error);
  });

// Add a response interceptor
axios.interceptors.response.use(function (response) {
    // Any status code that lie within the range of 2xx cause this function to trigger
    // Do something with response data
    return response;
  }, function (error) {
    // Any status codes that falls outside the range of 2xx cause this function to trigger
    // Do something with response error
    return Promise.reject(error);
  });