Depthcharge

Depthcharge is a piece of Rack middleware that enables extra visibility into the requests going through an application. The primary use case for this is to see the requests that are coming and going from a local server to a connected client app (like iOS simulator for example). Additionally it will automatically detect JSON responses and pretty print them to enhance readability.

GET 200 "/example.json" at 2017-04-30 23:32:16 -0400
  | PARAMS:
  |   test: "foo"
  |
  | REQUEST HEADERS:
  |   HTTP_HOST: "localhost:4567"
  |   HTTP_CONNECTION: "keep-alive"
  |   HTTP_CACHE_CONTROL: "max-age=0"
  |   HTTP_VERSION: "HTTP/1.1"
  |
  | RESPONSE STATUS: 200
  |
  | RESPONSE HEADERS:
  |   Content-Type: "application/json"
  |   Content-Length: "25"
  |
  | BODY:
  |   {
  |     "a": 1,
  |     "b": 2,
  |     "c": 3,
  |     "d": 4
  |   }
  |

Add this line to your application's Gemfile:

gem 'depthcharge'

And then execute:

$ bundle

Or install it yourself as:

$ gem install depthcharge

Just add gem 'depthcharge' to your app's Gemfile, then add the middleware to your app like so:

Sinatra:

use Depthcharge::Middleware, STDOUT, "depthcharge.log"

Rails:

# config/application.rb (or) config/environments/development.rb
config.middleware.use Depthcharge::Middleware, Rails.root.join("log", "depthcharge.log")

You can pass multiple outputs to Depthcharge::Middleware and it will write to each one for each request. Logging to STDOUT and a log file simultaneously is a handy use of this as demonstrated above with the Sinatra setup.

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