diff --git a/pytchat/__init__.py b/pytchat/__init__.py
index 2595d0c..d3550b4 100644
--- a/pytchat/__init__.py
+++ b/pytchat/__init__.py
@@ -2,7 +2,7 @@
 pytchat is a lightweight python library to browse youtube livechat without Selenium or BeautifulSoup.
 """
 __copyright__    = 'Copyright (C) 2019, 2020 taizan-hokuto'
-__version__      = '0.4.5'
+__version__      = '0.4.6'
 __license__      = 'MIT'
 __author__       = 'taizan-hokuto'
 __author_email__ = '55448286+taizan-hokuto@users.noreply.github.com'
diff --git a/pytchat/processors/default/processor.py b/pytchat/processors/default/processor.py
index d8bbac5..e28da0e 100644
--- a/pytchat/processors/default/processor.py
+++ b/pytchat/processors/default/processor.py
@@ -112,7 +112,7 @@ class Chatdata:
             await asyncio.sleep(1 - stop_interval)
 
     def json(self) -> str:
-        return json.dumps([vars(a) for a in self.items], ensure_ascii=False, cls=CustomEncoder)
+        return ''.join(("[", ','.join((a.json() for a in self.items)), "]"))
 
 
 class DefaultProcessor(ChatProcessor):
diff --git a/tests/test_default_processor.py b/tests/test_default_processor.py
index c0fc5b9..819a6da 100644
--- a/tests/test_default_processor.py
+++ b/tests/test_default_processor.py
@@ -222,6 +222,60 @@ def test_sponsor_legacy(mocker):
     assert ret.author.isChatModerator is False
 
 
+def test_jsonify_list(mocker):
+    '''lagacy sponsor(membership)'''
+    processor = DefaultProcessor()
+    parser = Parser(is_replay=False)
+    _json = _open_file("tests/testdata/default/superchat.json")
+
+    _, chatdata = parser.parse(parser.get_contents(json.loads(_json)))
+    data = {
+        "video_id": "",
+        "timeout": 7,
+        "chatdata": chatdata
+    }
+    
+    ret = processor.process([data]).json()
+    tobe = _open_file("tests/testdata/default/jsonified_list.json")
+    assert ret == tobe
+    
+
+def test_jsonify_item(mocker):
+    '''lagacy sponsor(membership)'''
+    processor = DefaultProcessor()
+    parser = Parser(is_replay=False)
+    _json = _open_file("tests/testdata/default/superchat.json")
+
+    _, chatdata = parser.parse(parser.get_contents(json.loads(_json)))
+    data = {
+        "video_id": "",
+        "timeout": 7,
+        "chatdata": chatdata
+    }
+    
+    ret = processor.process([data]).items[0].json()
+    tobe = _open_file("tests/testdata/default/jsonified_item.json")
+    assert ret == tobe
+
+
+def test_jsonify_item(mocker):
+    '''lagacy sponsor(membership)'''
+    processor = DefaultProcessor()
+    parser = Parser(is_replay=False)
+    _json = _open_file("tests/testdata/default/superchat.json")
+
+    _, chatdata = parser.parse(parser.get_contents(json.loads(_json)))
+    data = {
+        "video_id": "",
+        "timeout": 7,
+        "chatdata": chatdata
+    }
+    
+    ret = processor.process([data]).items[0].json()
+    tobe = _open_file("tests/testdata/default/jsonified_item.json")
+    assert ret == tobe
+
+
 def _open_file(path):
     with open(path, mode='r', encoding='utf-8') as f:
         return f.read()
diff --git a/tests/testdata/default/jsonified_item.json b/tests/testdata/default/jsonified_item.json
new file mode 100644
index 0000000..e1e0d31
--- /dev/null
+++ b/tests/testdata/default/jsonified_item.json
@@ -0,0 +1 @@
+{"author": {"badgeUrl": "", "type": "", "isVerified": false, "isChatOwner": false, "isChatSponsor": false, "isChatModerator": false, "channelId": "author_channel_id", "channelUrl": "http://www.youtube.com/channel/author_channel_id", "name": "author_name", "imageUrl": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s64-x-x-xx-xx-xx-c0xffffff/photo.jpg"}, "type": "superChat", "id": "dummy_id", "timestamp": 1570678496000, "elapsedTime": "", "datetime": "2019-10-10 12:34:56", "message": "dummy_message", "messageEx": ["dummy_message"], "amountValue": 800.0, "amountString": "￥800", "currency": "JPY", "bgColor": 4280150454, "colors": {"headerBackgroundColor": 4278239141, "headerTextColor": 4278190080, "bodyBackgroundColor": 4280150454, "bodyTextColor": 4278190080, "timestampColor": 2147483648, "authorNameTextColor": 2315255808}}
\ No newline at end of file
diff --git a/tests/testdata/default/jsonified_list.json b/tests/testdata/default/jsonified_list.json
new file mode 100644
index 0000000..3d6fe70
--- /dev/null
+++ b/tests/testdata/default/jsonified_list.json
@@ -0,0 +1 @@
+[{"author": {"badgeUrl": "", "type": "", "isVerified": false, "isChatOwner": false, "isChatSponsor": false, "isChatModerator": false, "channelId": "author_channel_id", "channelUrl": "http://www.youtube.com/channel/author_channel_id", "name": "author_name", "imageUrl": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s64-x-x-xx-xx-xx-c0xffffff/photo.jpg"}, "type": "superChat", "id": "dummy_id", "timestamp": 1570678496000, "elapsedTime": "", "datetime": "2019-10-10 12:34:56", "message": "dummy_message", "messageEx": ["dummy_message"], "amountValue": 800.0, "amountString": "￥800", "currency": "JPY", "bgColor": 4280150454, "colors": {"headerBackgroundColor": 4278239141, "headerTextColor": 4278190080, "bodyBackgroundColor": 4280150454, "bodyTextColor": 4278190080, "timestampColor": 2147483648, "authorNameTextColor": 2315255808}}]
\ No newline at end of file