class ArticlesController < ApplicationController
  def new
  end

  def create
    render plain: params[:article].inspect
  end

end

Template is missing
Missing template articles/create, application/create with {:locale=>[:en], :formats=>[:html],    :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}.`

articles GET    /articles(.:format)          articles#index
         POST   /articles(.:format)          articles#create

render plain: params[:article].inspect

render text: params[:article].inspect

class ArticlesController < ApplicationController
  def new
  end

  def create
    render text: params[:article].inspect
  end
end

{"title"=>"First article!", "text"=>"This is my first article."}
# i.e. your params(whatever params hash contains)

class ArticlesController < ApplicationController
 def new
 end

 def create
  params[:article].inspect
  render nothing: true
 end
end