diff --git a/js/docx/smoke/api_stroke/to_json.js b/js/docx/smoke/api_stroke/to_json.js
new file mode 100644
index 000000000..fd3fd7788
--- /dev/null
+++ b/js/docx/smoke/api_stroke/to_json.js
@@ -0,0 +1,29 @@
+builder.CreateFile("docx");
+    let oDocument = Api.GetDocument();
+    let oParagraph = oDocument.GetElement(0);
+    let oRGBColor = Api.CreateRGBColor(255, 111, 61);
+    let oFill = Api.CreateSolidFill(oRGBColor);
+    let oStroke = Api.CreateStroke(5 * 36000, Api.CreateSolidFill(Api.CreateRGBColor(51, 51, 51)));
+    let jsonStroke = oStroke.ToJSON();
+        oParagraph.AddText(jsonStroke);
+        GlobalVariable["JSON_Stroke"] = jsonStroke;
+builder.CloseFile();
+
+//////////////////////
+
+builder.CreateFile("docx");
+    let oDocument = Api.GetDocument();
+    let oParagraph1 = oDocument.GetElement(0);
+    let jsonStroke = GlobalVariable["JSON_Stroke"];
+    let oStrokeFromJSON = Api.FromJSON(jsonStroke);
+        oParagraph1.AddText(jsonStroke);
+        oDocument.Push(oParagraph1);
+    let oParagraph2 = Api.CreateParagraph();
+    let oRGBColor2 = Api.CreateRGBColor(255, 213, 191);
+    let oFill2 = Api.CreateSolidFill(oRGBColor2);
+    let oDrawing = Api.CreateShape("roundRect", 5930900, 395605, oFill2, oStrokeFromJSON);
+    let jsonDrawing = oDrawing.ToJSON(false, true);
+        oParagraph2.AddText(jsonDrawing);
+        oDocument.Push(oParagraph2);
+builder.SaveFile("docx", "StrokeToJson.docx");
+builder.CloseFile();
diff --git a/spec/docx/smoke/api_stroke_spec.rb b/spec/docx/smoke/api_stroke_spec.rb
index a594cd3d8..425d7e709 100644
--- a/spec/docx/smoke/api_stroke_spec.rb
+++ b/spec/docx/smoke/api_stroke_spec.rb
@@ -6,4 +6,13 @@
     docx = builder.build_and_parse('js/docx/smoke/api_stroke/get_class_type.js')
     expect(docx.elements[1].nonempty_runs.first.text).to eq('Class Type = stroke')
   end
+
+  it 'ApiRGBColor | ToJSON method' do
+    docx = builder.build_and_parse('js/docx/smoke/api_stroke/to_json.js')
+    json = JSON.parse(docx.elements[1].nonempty_runs.first.text)
+    stroke = json['graphic']['spPr']['ln']['fill']['fill']['color']['color']['rgba']
+    expect(stroke['red']).to eq(51)
+    expect(stroke['green']).to eq(51)
+    expect(stroke['blue']).to eq(51)
+  end
 end