Sometimes I find it handy when I'm developing a single page app to have all front-end errors forwarded to the backend's log (when something doesn't work, I can look in a single terminal window)

client.js

const puts = (...anything) => {
  fetch("/api/puts", {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({content: anything})
  })
}

window.onerror = (message) => {
  puts('JS Error:', message)
  return false
}

puts_controller.rb

module Api
  class PutsController < ApiController
    def create
      puts <<~TEXT
      Client logger says:

      #{params[:content].map(&:to_json).join(", ")}
      TEXT

    end
  end
end