laravel/resources/assets/js/app.js

window.Cookies = require('js-cookie');

/**
 * Vue.js
 *
 * Vue is a modern JavaScript for building interactive web interfaces using
 * reacting data binding and reusable components. Vue's API is clean and
 * simple, leaving you to focus only on building your next great idea.
 */
window.Vue = require('vue');

require('vue-resource');

/**
 * The XSRF Header
 *
 * We'll register a HTTP interceptor to attach the "XSRF" header to each of
 * the outgoing requests issued by this application. The CSRF middleware
 * included with Laravel will automatically verify the header's value.
 */
Vue.http.interceptors.push(function (request, next) {
    request.headers['X-XSRF-TOKEN'] = Cookies.get('XSRF-TOKEN');

    next();
});