SnakyCamel

SnakyCamel is Rack middleware for Rails that automatically converts request parameter keys to snake_case and response keys to camelCase.

This is useful if you Rails app is being used as an API for a JavaScript frontend. In Ruby and Rails, the widely adopted naming convention is to use snake_case for variables, keys etc. Popular JavaScript style guides (such as the Airbnb JavaScript Style Guide) tend to recommend camelCase. This gem allows you to use snake_case in all Ruby/Rails code and camelCase in JavaScript code without having to worry about converting the case of parameter names or having non-conventional names.

1. Add this line to your application's Gemfile and execute bundle install:

gem 'snaky_camel'

2. Add this line as the last config to config/application.rb:

config.middleware.use "SnakyCamel::Middleware"

Conversion is automatic. All parameter keys in RESTful requests to your Rails application are converted to snake_case. All JSON response keys from your Rails application are converted to camelCase.

Example:

• Your application receives a request to yourapp.com/search?searchQuery=cobra. In the params hash in your Rails controller, the param key name will be search_query.
• You render JSON with your controller with this code: render json: { search_results: ['dromedary'] }, status: :ok. The actual response is converted to { searchResults: ['dromedary'] }.

Bug reports and pull requests are welcome on GitHub at https://github.com/p4sh4/snaky_camel.

The gem is available as open source under the terms of the MIT License.