diff --git a/Gemfile.lock b/Gemfile.lock
index a04c7f8..51fe047 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     ast (2.4.1)
     byebug (11.1.3)
     diff-lcs (1.4.4)
-    docile (1.3.2)
+    docile (1.4.0)
     parallel (1.19.2)
     parser (2.7.1.4)
       ast (~> 2.4.1)
@@ -37,10 +37,12 @@ GEM
     rubocop-ast (0.3.0)
       parser (>= 2.7.1.4)
     ruby-progressbar (1.10.1)
-    simplecov (0.18.5)
+    simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
-    simplecov-html (0.12.2)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.3)
     unicode-display_width (1.7.0)
 
 PLATFORMS
@@ -54,4 +56,4 @@ DEPENDENCIES
   simplecov (~> 0.18)
 
 BUNDLED WITH
-   2.1.0
+   2.3.4
diff --git a/README.md b/README.md
index 5654694..601dfc1 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,11 @@
 
 ***Note: To learn more about SimpleCov, check out the main repo at [https://github.com/simplecov-ruby/simplecov](https://github.com/colszowka/simplecov***)***
 
-Generates a formatted JSON report of your [SimpleCov](https://github.com/simplecov-ruby/simplecov) ruby code coverage results on ruby 2.4+. Originally intended to add `simplecov`'s results reading capacity to CI tools. 
+Generates a formatted JSON report of your [SimpleCov](https://github.com/simplecov-ruby/simplecov) ruby code coverage results on ruby 2.4+. Originally intended to add `simplecov`'s results reading capacity to CI tools.
 
 ## Overview
 
-You can expect for this gem to produce a `coverage.json` file, located at the `coverage` folder. 
+You can expect for this gem to produce a `coverage.json` file, located at the `coverage` folder.
 
 Depending on your `SimpleCoV`'s settings you will experiment different outcomes. Particularly depending on which type of coverage are you running `SimpleCov` with:
 
@@ -15,13 +15,14 @@ Depending on your `SimpleCoV`'s settings you will experiment different outcomes.
 
 ## Development
 
-We encourage you to use docker for common operations like running tests, or debugging your code. Running `make sh` will start a new container instance based on the `Dockerfile` provided at root, finally a shell prompt will be displayed on your terminal. Also, syncronization with your local files will be already set. 
+We encourage you to use docker for common operations like running tests, or debugging your code. Running `make sh` will start a new container instance based on the `Dockerfile` provided at root, finally a shell prompt will be displayed on your terminal. Also, syncronization with your local files will be already set.
+
 ### Tests
 `make test` will trigger the excution of both running tests and running rubocop as linter, by simply running `rake`, this actions will be run inside a new container but using your local files.
 
 ### Format
 
-`make format` will run `rubocop -a` which stands for _autocorrect_ and format your code according to the `.rubocop.yml` config file. 
+`make format` will run `rubocop -a` which stands for _autocorrect_ and format your code according to the `.rubocop.yml` config file.
 
 ## Copyright
 
diff --git a/lib/simplecov_json_formatter/result_hash_formatter.rb b/lib/simplecov_json_formatter/result_hash_formatter.rb
index 9dfe47d..e9c8fc8 100644
--- a/lib/simplecov_json_formatter/result_hash_formatter.rb
+++ b/lib/simplecov_json_formatter/result_hash_formatter.rb
@@ -9,22 +9,38 @@ def initialize(result)
     end
 
     def format
+      format_files
+      format_groups
+
+      formatted_result
+    end
+
+    private
+
+    def format_files
       @result.files.each do |source_file|
         formatted_result[:coverage][source_file.filename] =
           format_source_file(source_file)
       end
-
-      formatted_result
     end
 
-    private
+    def format_groups
+      @result.groups.each do |name, file_list|
+        formatted_result[:groups][name] = {
+          lines: {
+            covered_percent: file_list.covered_percent
+          }
+        }
+      end
+    end
 
     def formatted_result
       @formatted_result ||= {
         meta: {
           simplecov_version: SimpleCov::VERSION
         },
-        coverage: {}
+        coverage: {},
+        groups: {}
       }
     end
 
diff --git a/spec/fixtures/sample.json b/spec/fixtures/sample.json
index 359ee47..058cea3 100644
--- a/spec/fixtures/sample.json
+++ b/spec/fixtures/sample.json
@@ -1,9 +1,9 @@
 {
   "meta": {
-    "simplecov_version": "0.18.5"
+    "simplecov_version": "0.21.2"
   },
   "coverage": {
-    "/gem/spec/fixtures/sample.rb": {
+    "/STUB_WORKING_DIRECTORY/spec/fixtures/sample.rb": {
       "lines": [
         null,
         1,
@@ -32,5 +32,6 @@
         null
       ]
     }
-  }
-}
\ No newline at end of file
+  },
+  "groups": {}
+}
diff --git a/spec/fixtures/sample_groups.json b/spec/fixtures/sample_groups.json
new file mode 100644
index 0000000..c825056
--- /dev/null
+++ b/spec/fixtures/sample_groups.json
@@ -0,0 +1,43 @@
+{
+  "meta": {
+    "simplecov_version": "0.21.2"
+  },
+  "coverage": {
+    "/STUB_WORKING_DIRECTORY/spec/fixtures/sample.rb": {
+      "lines": [
+        null,
+        1,
+        1,
+        1,
+        1,
+        null,
+        null,
+        1,
+        1,
+        null,
+        null,
+        1,
+        1,
+        0,
+        null,
+        1,
+        null,
+        null,
+        null,
+        "ignored",
+        "ignored",
+        "ignored",
+        "ignored",
+        "ignored",
+        null
+      ]
+    }
+  },
+  "groups": {
+    "My Group": {
+      "lines": {
+        "covered_percent": 80.0
+      }
+    }
+  }
+}
diff --git a/spec/fixtures/sample_with_branch.json b/spec/fixtures/sample_with_branch.json
index 201c7f8..33fc1c3 100644
--- a/spec/fixtures/sample_with_branch.json
+++ b/spec/fixtures/sample_with_branch.json
@@ -1,9 +1,9 @@
 {
   "meta": {
-    "simplecov_version": "0.18.5"
+    "simplecov_version": "0.21.2"
   },
   "coverage": {
-    "/gem/spec/fixtures/sample.rb": {
+    "/STUB_WORKING_DIRECTORY/spec/fixtures/sample.rb": {
       "lines": [
         null,
         1,
@@ -46,5 +46,6 @@
         }
       ]
     }
-  }
-}
\ No newline at end of file
+  },
+  "groups": {}
+}
diff --git a/spec/simplecov_json_formatter_spec.rb b/spec/simplecov_json_formatter_spec.rb
index c29aaa8..099d899 100644
--- a/spec/simplecov_json_formatter_spec.rb
+++ b/spec/simplecov_json_formatter_spec.rb
@@ -14,14 +14,14 @@
   end
 
   describe 'format' do
-    context 'whit line coverage' do
+    context 'with line coverage' do
       it 'works' do
         subject.format(result)
         expect(json_ouput).to eq(json_result('sample'))
       end
     end
 
-    context 'whit branch coverage' do
+    context 'with branch coverage' do
       let(:original_lines) do
         [nil, 1, 1, 1, 1, nil, nil, 1, 1,
          nil, nil, 1, 1, 0, nil, 1, nil,
@@ -55,5 +55,26 @@
         expect(json_ouput).to eq(json_result('sample_with_branch'))
       end
     end
+
+    context 'with groups' do
+      let(:result) do
+        res = SimpleCov::Result.new({
+                                      source_fixture('sample.rb') => { 'lines' => [
+                                        nil, 1, 1, 1, 1, nil, nil, 1, 1, nil, nil,
+                                        1, 1, 0, nil, 1, nil, nil, nil, nil, 1, 0, nil, nil, nil
+                                      ] }
+                                    })
+
+        # right now SimpleCov works mostly on global state, hence setting the groups that way
+        # would be global state --> Mocking is better here
+        allow(res).to receive_messages(groups: { 'My Group' => double('File List', covered_percent: 80.0) })
+        res
+      end
+
+      it 'displays groups correctly in the JSON' do
+        subject.format(result)
+        expect(json_ouput).to eq(json_result('sample_groups'))
+      end
+    end
   end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 787d33e..5e3bc69 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -20,5 +20,14 @@ def json_ouput
 
 def json_result(filename)
   file = File.read(source_fixture("#{filename}.json"))
+  file = use_current_working_directory(file)
   JSON.parse(file)
 end
+
+DEFAULT_WORKING_DIRECTORY = 'STUB_WORKING_DIRECTORY'
+def use_current_working_directory(file)
+  current_working_directory = File.expand_path('..', File.dirname(__FILE__))
+  file.gsub!("/#{DEFAULT_WORKING_DIRECTORY}/", "#{current_working_directory}/")
+
+  file
+end