To use CSRF, enable the pipe in your routes.cr by adding the following pipe to a pipeline.

plug Amber::Pipe::CSRF.new

Then, insert the csrf_tag helper in your forms.

How to use CSRF with AJAX

Simply call the csrf_tag helper inside your controller and return it as part of a JSON object:

def my_action
{csrf: csrf_tag}.to_json

In your Javascript, after getting the JSON object back, refresh your CSRF tag with the one from the server.