diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..aaabdf7
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,13 @@
+source 'https://rubygems.org'
+
+gemspec
+
+group :development do
+  gem "mocha", :require => false
+  # Use local copy of simplecov in development when checked out or fetch from git
+  if File.directory?(File.dirname(__FILE__) + '/../simplecov')
+    gem 'simplecov', :path => File.dirname(__FILE__) + '/../simplecov'
+  else
+    gem 'simplecov', :git => 'https://github.com/colszowka/simplecov'
+  end
+end
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e9e9153
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+Copyright (c) 2012 Vicent Llongo Silla
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
index 1f8b81b..97d0f66 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,52 @@
 simplecov-json
 ==============
 
-JSON formatter for the ruby 1.9+ coverage gem SimpleCov
\ No newline at end of file
+JSON formatter for the ruby 1.9+ coverage gem SimpleCov
+
+Usage
+-----
+
+1. Add simplecov-json to your `Gemfile` and `bundle install`:
+
+        gem 'simplecov-json', :require => false, :group => :test
+
+2. Require simplecov-json and set it up as SimpleCov's formatter: 
+
+        require 'simplecov-json'
+        SimpleCov.formatter = SimpleCov::Formatter::JSONFormatter
+
+Result
+------
+
+Generated JSON can be found in coverage/coverage.json
+
+The format you can expect is:
+
+        {
+            "timestamp": 1348489587,
+            "command_name": "RSpec",
+            "files": [
+                {
+                    "filename": "/home/user/rails/environment.rb",
+                    "coverage": [
+                        null,
+                        1,
+                        null,
+                        null,
+                        1
+                    ]
+                },
+                ...
+            ],
+            "groups": {},
+            "metrics": {
+                  "covered_percent": 81.70731707317073,
+                  "covered_strength": 0.8170731707317073,
+                  "covered_lines": 67,
+                  "total_lines": 82
+            }
+        }
+
+## Copyright
+
+Copyright (c) 2012 Vicent Llongo. See LICENSE for details.
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..a86f1fb
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,12 @@
+require 'bundler'
+Bundler::GemHelper.install_tasks
+
+require 'rake/testtask'
+Rake::TestTask.new(:test) do |test|
+  test.libs << 'lib' << 'test'
+  test.pattern = 'test/**/test_*.rb'
+  test.verbose = true
+end
+
+task :default => :test
+
diff --git a/lib/simplecov-json.rb b/lib/simplecov-json.rb
new file mode 100644
index 0000000..874be89
--- /dev/null
+++ b/lib/simplecov-json.rb
@@ -0,0 +1,49 @@
+require 'simplecov'
+require 'json'
+
+class SimpleCov::Formatter::JSONFormatter
+  def format(result)
+    puts result.inspect
+    data = {}
+    data[:timestamp] = result.created_at.to_i
+    data[:command_name] = result.command_name
+    data[:files] = []
+    result.original_result.each do |filename,coverage| 
+      next unless result.filenames.include? filename
+      data[:files] << {
+        filename: filename,
+        coverage: coverage,
+      }
+    end
+    data[:groups] = result.groups
+    data[:metrics] = {
+      covered_percent: result.covered_percent,
+      covered_strength: result.covered_strength,
+      covered_lines: result.covered_lines,
+      total_lines: result.total_lines,
+    }
+    File.open(File.join(output_path, output_filename), "w+") do |file|
+      file.puts data.to_json
+    end
+    puts output_message(result)
+    data.to_json
+  end
+
+  def output_filename
+    'coverage.json'
+  end
+
+  def output_filepath
+    File.join(output_path, output_filename)
+  end
+
+  def output_message(result)
+    "Coverage report generated for #{result.command_name} to #{output_filepath}. #{result.covered_lines} / #{result.total_lines} LOC (#{result.covered_percent.round(2)}%) covered."
+  end
+
+  private 
+  
+  def output_path
+    SimpleCov.coverage_path
+  end
+end
diff --git a/simplecov-json.gemspec b/simplecov-json.gemspec
new file mode 100644
index 0000000..b779fb6
--- /dev/null
+++ b/simplecov-json.gemspec
@@ -0,0 +1,21 @@
+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+
+Gem::Specification.new do |s|
+  s.name        = "simplecov-json"
+  s.version     = '0.1.1'
+  s.platform    = Gem::Platform::RUBY
+  s.authors     = ["Vicent Llongo"]
+  s.email       = ["villosil@gmail.com"]
+  s.homepage    = "https://github.com/vicentllongo/simplecov-json"
+  s.summary     = %Q{JSON formatter for SimpleCov code coverage tool for ruby 1.9+}
+  s.description = %Q{JSON formatter for SimpleCov code coverage tool for ruby 1.9+}
+
+  s.rubyforge_project = "simplecov-json"
+  s.files         = ['lib/simplecov-json.rb']
+  s.test_files    = ['test/helper', 'test/test_simplecov_json.rb']
+  s.require_paths = ["lib"]
+  
+  s.add_dependency(%q<simplecov>, [">= 0"])
+  s.add_dependency(%q<json>, [">= 0"])
+end
diff --git a/test/helper.rb b/test/helper.rb
new file mode 100644
index 0000000..df6ee5f
--- /dev/null
+++ b/test/helper.rb
@@ -0,0 +1,10 @@
+require 'rubygems'
+require 'bundler/setup'
+require 'simplecov'
+require 'simplecov-json'
+
+require 'test/unit'
+require 'mocha'
+
+class Test::Unit::TestCase
+end
diff --git a/test/test_simplecov_json.rb b/test/test_simplecov_json.rb
new file mode 100644
index 0000000..c39b77d
--- /dev/null
+++ b/test/test_simplecov_json.rb
@@ -0,0 +1,46 @@
+require 'helper'
+
+class TestSimpleCovHtml < Test::Unit::TestCase
+  def test_format
+    formatter = SimpleCov::Formatter::JSONFormatter.new
+    result = mock()
+    created_at = DateTime.now.to_s
+    
+    result.expects(:created_at).returns(created_at)
+    result.expects(:command_name).returns('RSpec')
+    result.expects(:original_result).returns({
+      '/lib/foo.rb' => [1, nil, 0, 0, nil, 1, nil],
+      '/lib/bar.rb' => [nil, 1, nil, 1, 1, 1, 0, 0, nil, 1, nil],
+      '/test/test.rb' => [nil, 1, 1, 1, 1]
+    })
+    result.expects(:filenames).returns(['/lib/foo.rb', '/lib/bar.rb'])
+    result.expects(:filenames).returns(['/lib/foo.rb', '/lib/bar.rb'])
+    result.expects(:filenames).returns(['/lib/foo.rb', '/lib/bar.rb'])
+    result.expects(:groups).returns(['controllers', 'models'])
+    result.expects(:covered_percent).returns(73.33)
+    result.expects(:covered_strength).returns(0.87)
+    result.expects(:covered_lines).returns(11)
+    result.expects(:total_lines).returns(15)
+
+    result.expects(:command_name).returns('RSpec')
+    result.expects(:covered_lines).returns(11)
+    result.expects(:total_lines).returns(15)
+    result.expects(:covered_percent).returns(73.33)
+
+    assert_equal(formatter.format(result), {
+      'timestamp' => created_at.to_i, 
+      'command_name' => 'RSpec', 
+      'files' => [
+        {'filename' => '/lib/foo.rb', 'coverage' => [1, nil, 0, 0, nil, 1, nil]},
+        {'filename' => '/lib/bar.rb', 'coverage' => [nil, 1, nil, 1, 1, 1, 0, 0, nil, 1, nil]},
+      ],
+      'groups' =>['controllers', 'models'],
+      'metrics' => {
+        'covered_percent' => 73.33,
+        'covered_strength' => 0.87,
+        'covered_lines' => 11,
+        'total_lines' => 15,
+      } 
+    }.to_json)
+  end
+end