How to Fix CSRF Error in Ruby

The CSRF Error in Ruby can stop your project dead in its tracks. Let's break down what causes it and how to resolve it quickly.

Understanding the Problem

CSRF errors happen when your application can't verify that a form submission originated from your own site. Without proper token validation, the server rejects the request to prevent malicious cross-site attacks.

Solution

The key is to use Rails built-in protect_from_forgery and skip it only for API endpoints:

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception

  # For JSON API endpoints
  skip_before_action :verify_authenticity_token, if: :json_request?

  private

  def json_request?
    request.format.json?
  end
end

Common Pitfall

Many developers waste time on this by looking in the wrong place. The error message can be misleading — focus on the Ruby configuration rather than the application logic itself. This is also a good opportunity to review your Ruby project's error handling strategy and make sure similar issues are caught early.

Confirming It Works

To confirm the fix is working, check your Ruby application logs for any remaining error traces. You should see clean request/response cycles without the previous error. Deploy to a staging environment to verify the fix holds under production-like conditions.

Going Forward

Consider integrating [Bugsly](https://bugsly.dev) into your Ruby workflow to catch, track, and resolve errors like this automatically.