YagniJsonEncoder

Oj now supports the ability to optimize Rails without any modifications. Read more about it here

This gem overrides the default ActiveSupport JSON encoder with a faster encoder which makes a few assumptions about your app.

1. You do not need the escape HTML entities in your JSON
2. You do not need any special escaping besides that provided by the JSON standard.

Under the hood, this app removes Rails' special JSON escaping, and relies on Oj to do the heavy lifting of JSON encoding.

By default, Rails plays it safe and escapes \u2028 and \u2029. In order to do this, a #gsub call (O(n) time complexity) is required on every string it encounters. I do not interface with old browsers, so escaping these characters is useless to me. Instead, we dont escape these characters, and let Oj do all the heavy JSON encoding work.

In a real Rails app, I benchmarked Tips.all.to_json with the different encoders. On average, YagniJsonEncoder is ~2x as fast. However, you could see bigger gains if your models are text/string-heavy.

Calculating -------------------------------------
    YagniJsonEncoder    10.000  i/100ms
      JSONGemEncoder     5.000  i/100ms
-------------------------------------------------
    YagniJsonEncoder    105.536  (± 6.6%) i/s -    530.000
      JSONGemEncoder     50.605  (± 4.0%) i/s -    255.000

Comparison:
    YagniJsonEncoder:      105.5 i/s
      JSONGemEncoder:       50.6 i/s - 2.09x slower

Just add this line to your application's Gemfile:

gem 'yagni_json_encoder'

And then execute:

$ bundle

Or install it yourself as:

$ gem install yagni_json_encoder

Bug reports and pull requests are welcome on GitHub at https://github.com/ianks/yagni_json_encoder.