Laravel is not defined
Or for a cleaner format:
<script> window.Laravel = { csrfToken: '{{ csrf_token() }}' };</script>Does same thing as Rocco's answer.
Try to put this on your blade, as you can see is inserted by default on app.blade on Laravel 5.3
<script> window.Laravel = <?php echo json_encode([ 'csrfToken' => csrf_token(), ]); ?></script>
if you're using axios then ensure the following is in your bootstrap.js file after axios is imported:
window.axios.defaults.headers.common = { 'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').getAttribute('content'), 'X-Requested-With': 'XMLHttpRequest'};