Ajax post request in laravel 5 return error 500 (Internal Server Error)

While this question exists for a while, but no accepted answer is given I'd like to point you towards the solution. Because you're sending with ajax, and presumably still use the CSRF middleware, you need to provide an additional header with your request.

Add a meta-tag to each page (or master layout): <meta name="csrf-token" content="{{ csrf_token() }}">

And add to your javascript-file (or section within the page):

$.ajaxSetup({
  headers: {
    'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
  }
});

See https://laravel.com/docs/master/csrf#csrf-x-csrf-token for more details.

90% of the laravel ajax internal server error is due to missing CSRF token. other reasons can inlucde:

• Wrong Request Type (e.g sending post to get)
• Wrong data type recived (e.g ajax is expecting JSON and app returns string)
• Your .htaccess is misconfigured
• Missing Route
• Code Error

You can read further about this in details here: https://abbasharoon.me/how-to-fix-laravel-ajax-500-internal-server-error/