Laravel Axios app.js

app.axios.js

/**
 * We'll load the axios HTTP library which allows us to easily issue requests
 * to our Laravel back-end. This library automatically handles sending the
 * CSRF token as a header based on the value of the "XSRF" token cookie.
 */

require('es6-promise').polyfill();
window.axios = require('axios');

window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';

/**
 * Next we will register the CSRF Token as a common header with Axios so that
 * all outgoing HTTP requests automatically have it attached. This is just
 * a simple convenience so we don't have to attach every token manually.
 */

let token = document.head.querySelector('meta[name="csrf-token"]');

if (token) {
  // Add the csrf token to both axios calls and jquery ajax calls
  $.ajaxSetup({
    headers: {
      'X-CSRF-TOKEN': token.content
    }
  });
  window.axios.defaults.headers.common['X-CSRF-TOKEN'] = token.content;
} else {
    console.error('CSRF token not found: https://laravel.com/docs/csrf#csrf-x-csrf-token');
}

If you're planning on using axios with ie11 clients you'll need to polyfill the Promise using something like https://github.com/stefanpenner/es6-promise