Rails 3: How to return errors in a JSON request?

The same way you return such errors with html, it’s part of the HTTP Header. render json: @myobject, status: :unprocessable_entity Update, response to comment: You can get all the status codes from Rack. Rails passes the symbolized status to Rack Rack::Utils.status_code(options[:status]) which simply matches the symbol to the list of status (the strings are converted … Read more

Using JSON with LogStash

Try removing the json codec and adding a json filter: input { file { type => “json” path => “/logs/mylogs.log” } } filter{ json{ source => “message” } } output { file { path => “/logs/out.log” } } You do not need the json codec because you do not want decode the source JSON but … Read more

What is the difference between AJAX, RESTful/Rest, JSON and JSONP?

Ajax – “Asynchronous Javascript and XML”. Ajax loosely defines a set of technologies to help make web applications present a richer user experience. Data updating and refreshing of the screen is done asynchronously using javascript and xml (or json or just a normal http post). JSON – “Javascript Object Notation”. JSON is like xml in … Read more