How to Resolve the Laravel 5.5 AJAX '419 (Unknown Status)' CSRF Error?

Laravel 5.5 AJAX Calls: Resolving the "419 (Unknown Status)" Error

When performing AJAX requests in Laravel 5.5, you may encounter the "419 (Unknown Status)" error. This generally indicates an issue with Cross-Site Request Forgery (CSRF) token verification.

Understanding Laravel's CSRF Protection

Laravel's CSRF protection mechanism prevents unauthorized requests from being submitted through your website. It does this by generating a unique token that must be included with every POST request.

Fixing the 419 Error

To fix the 419 error, you need to ensure that your AJAX request is properly protected by the CSRF token. You can do this in two steps:

1. Generate the CSRF Token in the HTML Header:
   In the section of your view, add the following:

   <meta name="csrf-token" content="{{ csrf_token() }}">

2. Retrieve the CSRF Token in JavaScript:
   Within your AJAX request setup, retrieve the CSRF token from the tag in the header:

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

Example Implementation

Here's an updated version of your AJAX call with the CSRF token protection:

$('.company-selector li > a').click(function(e) {
  e.preventDefault();

  var companyId = $(this).data("company-id");

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

  $.ajax({
    url: '/fetch-company/' + companyId,
    dataType: 'json',
    type: 'POST',
    data: {},
    contentType: false,
    processData: false,
    success: function(response) {
      console.log(response);
    }
  });
});

By incorporating these changes, your AJAX requests will be protected against CSRF attacks, resolving the "419 (Unknown Status)" error.

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