Laravel CSRF value empty

I am trying to add csrf in my laravel web app as meta tag -

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

but the value is empty when I browse it -

<meta name="csrf-token" content="">

I have also tried adding in login form also - as {!! csrf_filed() !!} or

<input type="hidden" name="_token" value="{{ csrf_token() }}">

but in both case value is null. I am using Angularjs in front end, does it have to do anything with that?

via Chebli Mohamed