Ruby-on-rails – How to “pretty” format JSON output in Ruby on Rails


I would like my JSON output in Ruby on Rails to be "pretty" or nicely formatted.

Right now, I call to_json and my JSON is all on one line. At times this can be difficult to see if there is a problem in the JSON output stream.

Is there way to configure to make my JSON "pretty" or nicely formatted in Rails?

Best Solution

Use the pretty_generate() function, built into later versions of JSON. For example:

require 'json'
my_object = { :array => [1, 2, 3, { :sample => "hash"} ], :foo => "bar" }
puts JSON.pretty_generate(my_object)

Which gets you:

  "array": [
      "sample": "hash"
  "foo": "bar"