diff --git a/pytchat/__init__.py b/pytchat/__init__.py
index c8f4d72..cd4f8fa 100644
--- a/pytchat/__init__.py
+++ b/pytchat/__init__.py
@@ -20,7 +20,7 @@ from .api import (
     CompatibleProcessor,
     DefaultProcessor, 
     SimpleDisplayProcessor,
-    JsonfileArchiveProcessor,
+    JsonfileArchiver,
     SpeedCalculator,
     DummyProcessor
 )
\ No newline at end of file
diff --git a/pytchat/api.py b/pytchat/api.py
index 10a7fba..6d6ceff 100644
--- a/pytchat/api.py
+++ b/pytchat/api.py
@@ -6,7 +6,7 @@ from .processors.chat_processor import ChatProcessor
 from .processors.default.processor import DefaultProcessor
 from .processors.compatible.processor import CompatibleProcessor
 from .processors.simple_display_processor import SimpleDisplayProcessor
-from .processors.jsonfile_archive_processor import JsonfileArchiveProcessor
+from .processors.jsonfile_archiver import JsonfileArchiver
 from .processors.speed_calculator import SpeedCalculator
 from .processors.dummy_processor import DummyProcessor
 from . import config
\ No newline at end of file
diff --git a/pytchat/processors/jsonfile_archive_processor.py b/pytchat/processors/jsonfile_archive_processor.py
deleted file mode 100644
index 5a5f3a1..0000000
--- a/pytchat/processors/jsonfile_archive_processor.py
+++ /dev/null
@@ -1,46 +0,0 @@
-import json
-import os
-import datetime
-from .chat_processor import ChatProcessor
-
-class JsonfileArchiveProcessor(ChatProcessor):
-    def __init__(self,filepath):
-        super().__init__()
-        if os.path.exists(filepath):
-            print('filepath is already exists!: ')
-            print('  '+filepath)
-            newpath=os.path.dirname(filepath) + \
-                '/'+datetime.datetime.now() \
-                .strftime('%Y-%m-%d %H-%M-%S')+'.data'
-
-            print('created alternate filename:')
-            print('   '+newpath)
-            self.filepath = newpath
-        else:
-            print('filepath: '+filepath)
-            self.filepath = filepath
-
-    def process(self,chat_components: list):
-        if chat_components:
-            with open(self.filepath, mode='a', encoding = 'utf-8') as f:
-                for component in chat_components:
-                    if component:
-                        chatdata = component.get('chatdata')
-                        for action in chatdata:
-                            if action:
-                                if action.get("addChatItemAction"):
-                                    if action["addChatItemAction"]["item"].get(
-                                    "liveChatViewerEngagementMessageRenderer"):
-                                        continue
-                                s = json.dumps(action,ensure_ascii = False)
-                                #print(s[:200])
-                                f.writelines(s+'\n')
-
-    def _parsedir(self,_dir):
-        if _dir[-1]=='\\' or _dir[-1]=='/':
-            separator =''
-        else:
-            separator ='/'
-        os.makedirs(_dir + separator, exist_ok=True)
-        return _dir  + separator
-
diff --git a/pytchat/processors/jsonfile_archiver.py b/pytchat/processors/jsonfile_archiver.py
new file mode 100644
index 0000000..f533564
--- /dev/null
+++ b/pytchat/processors/jsonfile_archiver.py
@@ -0,0 +1,66 @@
+import datetime
+import json
+import os
+import re
+from .chat_processor import ChatProcessor
+
+PATTERN  = re.compile(r"(.*)\(([0-9]+)\)$")
+
+class JsonfileArchiver(ChatProcessor):
+    """
+    JsonfileArchiver saves chat data as text of JSON lines.
+
+    Parameter:
+    ----------
+    save_path : str :
+        save path of file.If a file with the same name exists, 
+        it is automatically saved under a different name
+        with suffix '(number)'
+    """
+    def __init__(self,save_path):
+        super().__init__()
+        self.save_path = self._checkpath(save_path)
+        self.line_counter = 0
+                
+    def process(self,chat_components: list):
+        """
+        Returns
+        ----------
+        dict : 
+            save_path : str :
+                Actual save path of file.
+            total_lines : int :
+                count of total lines written to the file.
+        """
+        if chat_components is None: return
+        with open(self.save_path, mode='a', encoding = 'utf-8') as f:
+            for component in chat_components:
+                if component is None: continue
+                chatdata = component.get('chatdata')
+                if chatdata is None: continue
+                for action in chatdata:
+                    if action is None: continue
+                    json_line = json.dumps(action, ensure_ascii = False)
+                    f.writelines(json_line+'\n')
+                    self.line_counter+=1
+            return { "save_path"  : self.save_path,
+                     "total_lines": self.line_counter }
+    
+    def _checkpath(self, filepath):
+        splitter = os.path.splitext(os.path.basename(filepath))
+        body = splitter[0]
+        extention = splitter[1]
+        newpath = filepath
+        counter = 0
+        while os.path.exists(newpath):
+            match = re.search(PATTERN,body)
+            if match:
+                counter=int(match[2])+1
+                num_with_bracket = f'({str(counter)})'
+                body = f'{match[1]}{num_with_bracket}'
+            else:
+                body = f'{body}({str(counter)})'
+            newpath = os.path.join(os.path.dirname(filepath),body+extention)
+        return newpath
+
+
diff --git a/pytchat/tool/download/__init__.py b/pytchat/tool/extract/__init__.py
similarity index 100%
rename from pytchat/tool/download/__init__.py
rename to pytchat/tool/extract/__init__.py
diff --git a/pytchat/tool/download/asyncdl.py b/pytchat/tool/extract/asyncdl.py
similarity index 97%
rename from pytchat/tool/download/asyncdl.py
rename to pytchat/tool/extract/asyncdl.py
index 9d17692..c361754 100644
--- a/pytchat/tool/download/asyncdl.py
+++ b/pytchat/tool/extract/asyncdl.py
@@ -3,7 +3,7 @@ import asyncio
 import json
 from . import parser
 from . block import Block
-from . dlworker import DownloadWorker
+from . worker import ExtractWorker
 from . patch import Patch
 from ... import config 
 from ... paramgen import arcparam
@@ -79,11 +79,11 @@ def ready_blocks(video_id, duration, div, callback):
         _get_blocks(video_id, duration, div, callback))
     return blocks
 
-def download_patch(callback, blocks, video_id):
+def fetch_patch(callback, blocks, video_id):
 
     async def _allocate_workers():
         workers = [
-            DownloadWorker(
+            ExtractWorker(
                 fetch = _fetch,  block = block,
                 blocks = blocks, video_id = video_id
             )
diff --git a/pytchat/tool/download/block.py b/pytchat/tool/extract/block.py
similarity index 87%
rename from pytchat/tool/download/block.py
rename to pytchat/tool/extract/block.py
index 3ca42de..cd854e7 100644
--- a/pytchat/tool/download/block.py
+++ b/pytchat/tool/extract/block.py
@@ -16,9 +16,9 @@ class Block:
         this value increases as fetching chatdata progresses.
 
     end : int :
-        target videoOffsetTimeMs of last chat data for download,
+        target videoOffsetTimeMs of last chat data for extract,
         equals to first videoOffsetTimeMs of next block.
-        when download worker reaches this offset, stop downloading.
+        when extract worker reaches this offset, stop fetching.
 
     continuation : str :
         continuation param of last chat data.
@@ -26,10 +26,10 @@ class Block:
     chat_data : list 
 
     done : bool :
-        whether this block has been downloaded.
+        whether this block has been fetched.
     
     remaining : int :
-        remaining data to download.
+        remaining data to extract.
         equals end - last.
     
     is_last : bool :
diff --git a/pytchat/tool/download/duplcheck.py b/pytchat/tool/extract/duplcheck.py
similarity index 100%
rename from pytchat/tool/download/duplcheck.py
rename to pytchat/tool/extract/duplcheck.py
diff --git a/pytchat/tool/download/downloader.py b/pytchat/tool/extract/extractor.py
similarity index 89%
rename from pytchat/tool/download/downloader.py
rename to pytchat/tool/extract/extractor.py
index 15ab152..a8b5515 100644
--- a/pytchat/tool/download/downloader.py
+++ b/pytchat/tool/extract/extractor.py
@@ -8,7 +8,7 @@ from ... exceptions import InvalidVideoIdException
 logger = config.logger(__name__)
 headers=config.headers
 
-class Downloader:
+class Extractor:
     def __init__(self, video_id, duration, div, callback):
         if not isinstance(div ,int) or div < 1:
             raise ValueError('div must be positive integer.')
@@ -44,7 +44,7 @@ class Downloader:
         return self
 
     def _download_blocks(self):
-        asyncdl.download_patch(self.callback, self.blocks, self.video_id)
+        asyncdl.fetch_patch(self.callback, self.blocks, self.video_id)
         return self
 
     def _remove_duplicate_tail(self):
@@ -57,7 +57,7 @@ class Downloader:
             ret.extend(block.chat_data) 
         return ret
 
-    def download(self):
+    def extract(self):
         return (
             self._ready_blocks()
                 ._remove_duplicate_head()
@@ -68,7 +68,7 @@ class Downloader:
                 ._combine()
         )
 
-def download(video_id, div = 1, callback = None, processor = None):
+def extract(video_id, div = 1, callback = None, processor = None):
     duration = 0
     try:
         duration = VideoInfo(video_id).get("duration")
@@ -77,7 +77,7 @@ def download(video_id, div = 1, callback = None, processor = None):
     if duration == 0:
         print("video is live.")
         return []
-    data = Downloader(video_id, duration, div, callback).download()
+    data = Extractor(video_id, duration, div, callback).extract()
     if processor is None:
         return data
     return processor.process(
diff --git a/pytchat/tool/download/parser.py b/pytchat/tool/extract/parser.py
similarity index 100%
rename from pytchat/tool/download/parser.py
rename to pytchat/tool/extract/parser.py
diff --git a/pytchat/tool/download/patch.py b/pytchat/tool/extract/patch.py
similarity index 96%
rename from pytchat/tool/download/patch.py
rename to pytchat/tool/extract/patch.py
index 2305118..83a2e6d 100644
--- a/pytchat/tool/download/patch.py
+++ b/pytchat/tool/extract/patch.py
@@ -5,7 +5,7 @@ from typing import NamedTuple
 class Patch(NamedTuple):
     """
     Patch represents chunk of chat data
-    which is fetched by asyncdl.download_patch._fetch().
+    which is fetched by asyncdl.fetch_patch._fetch().
     """
     chats : list = []
     continuation : str = None
diff --git a/pytchat/tool/download/dlworker.py b/pytchat/tool/extract/worker.py
similarity index 87%
rename from pytchat/tool/download/dlworker.py
rename to pytchat/tool/extract/worker.py
index 5946bdf..e75a86d 100644
--- a/pytchat/tool/download/dlworker.py
+++ b/pytchat/tool/extract/worker.py
@@ -3,17 +3,17 @@ from . block import Block
 from . patch import Patch, fill, split
 from ... paramgen import arcparam
 
-class DownloadWorker:
+class ExtractWorker:
     """
-    DownloadWorker associates a download session with a block.
+    ExtractWorker associates a download session with a block.
 
-    When the dlworker finishes downloading, the block
-    being downloaded is splitted and assigned the free dlworker.
+    When the worker finishes fetching, the block
+    being fetched is splitted and assigned the free worker.
 
     Parameter
     ----------
     fetch : func :
-        download function of asyncdl
+        extract function of asyncdl
 
     block : Block :
         Block object that includes chat_data
@@ -40,7 +40,7 @@ class DownloadWorker:
             patch = await self.fetch(
                 self.block.continuation, session)
             if patch.continuation is None:
-                """TODO : make the dlworker assigned to the last block
+                """TODO : make the worker assigned to the last block
                 to work more than twice as possible.
                 """
                 break
@@ -50,7 +50,7 @@ class DownloadWorker:
             else:    
                 fill(self.block, patch)
             if self.block.continuation is None:
-                """finished downloading this block """
+                """finished fetching this block """
                 self.block.done = True
                 self.block = _search_new_block(self)
 
diff --git a/pytchat/tool/mining/asyncdl.py b/pytchat/tool/mining/asyncdl.py
index fd62b56..f2211c5 100644
--- a/pytchat/tool/mining/asyncdl.py
+++ b/pytchat/tool/mining/asyncdl.py
@@ -4,7 +4,7 @@ import asyncio
 import json
 from . import parser
 from . block import Block
-from . dlworker import DownloadWorker
+from . worker import ExtractWorker
 from . patch import Patch
 from ... import config 
 from ... paramgen import arcparam_mining as arcparam
@@ -84,11 +84,11 @@ def ready_blocks(video_id, duration, div, callback):
         _get_blocks(video_id, duration, div, callback))
     return blocks
 
-def download_patch(callback, blocks, video_id):
+def fetch_patch(callback, blocks, video_id):
 
     async def _allocate_workers():
         workers = [
-            DownloadWorker(
+            ExtractWorker(
                 fetch = _fetch,  block = block,
                 blocks = blocks, video_id = video_id
             )
diff --git a/pytchat/tool/mining/block.py b/pytchat/tool/mining/block.py
index 9767510..40c95d1 100644
--- a/pytchat/tool/mining/block.py
+++ b/pytchat/tool/mining/block.py
@@ -16,9 +16,9 @@ class Block:
         this value increases as fetching chatdata progresses.
 
     end : int :
-        target videoOffsetTimeMs of last chat data for download,
+        target videoOffsetTimeMs of last chat data for extract,
         equals to first videoOffsetTimeMs of next block.
-        when download worker reaches this offset, stop downloading.
+        when extract worker reaches this offset, stop fetching.
 
     continuation : str :
         continuation param of last chat data.
@@ -26,10 +26,10 @@ class Block:
     chat_data : list 
 
     done : bool :
-        whether this block has been downloaded.
+        whether this block has been fetched.
     
     remaining : int :
-        remaining data to download.
+        remaining data to extract.
         equals end - last.
     
     is_last : bool :
diff --git a/pytchat/tool/mining/patch.py b/pytchat/tool/mining/patch.py
index 186cc82..7666a52 100644
--- a/pytchat/tool/mining/patch.py
+++ b/pytchat/tool/mining/patch.py
@@ -5,7 +5,7 @@ from typing import NamedTuple
 class Patch(NamedTuple):
     """
     Patch represents chunk of chat data
-    which is fetched by asyncdl.download_patch._fetch().
+    which is fetched by asyncdl.fetch_patch._fetch().
     """
     chats : list = []
     continuation : str = None
diff --git a/pytchat/tool/mining/downloader.py b/pytchat/tool/mining/superchat_miner.py
similarity index 87%
rename from pytchat/tool/mining/downloader.py
rename to pytchat/tool/mining/superchat_miner.py
index 0df892b..d6052a8 100644
--- a/pytchat/tool/mining/downloader.py
+++ b/pytchat/tool/mining/superchat_miner.py
@@ -6,7 +6,7 @@ from ... exceptions import InvalidVideoIdException
 logger = config.logger(__name__)
 headers=config.headers
 
-class Downloader:
+class SuperChatMiner:
     def __init__(self, video_id, duration, div, callback):
         if not isinstance(div ,int) or div < 1:
             raise ValueError('div must be positive integer.')
@@ -34,7 +34,7 @@ class Downloader:
         return self
 
     def _download_blocks(self):
-        asyncdl.download_patch(self.callback, self.blocks, self.video_id)
+        asyncdl.fetch_patch(self.callback, self.blocks, self.video_id)
         return self
 
     def _combine(self):
@@ -43,7 +43,7 @@ class Downloader:
             ret.extend(block.chat_data) 
         return ret
 
-    def download(self):
+    def extract(self):
         return (
             self._ready_blocks()
                 ._set_block_end()
@@ -51,7 +51,7 @@ class Downloader:
                 ._combine()
         )
 
-def download(video_id, div = 1, callback = None, processor = None):
+def extract(video_id, div = 1, callback = None, processor = None):
     duration = 0
     try:
         duration = VideoInfo(video_id).get("duration")
@@ -60,7 +60,7 @@ def download(video_id, div = 1, callback = None, processor = None):
     if duration == 0:
         print("video is live.")
         return []
-    data = Downloader(video_id, duration, div, callback).download()
+    data = SuperChatMiner(video_id, duration, div, callback).extract()
     if processor is None:
         return data
     return processor.process(
diff --git a/pytchat/tool/mining/dlworker.py b/pytchat/tool/mining/worker.py
similarity index 80%
rename from pytchat/tool/mining/dlworker.py
rename to pytchat/tool/mining/worker.py
index f7da603..3a53e40 100644
--- a/pytchat/tool/mining/dlworker.py
+++ b/pytchat/tool/mining/worker.py
@@ -3,17 +3,17 @@ from . block import Block
 from . patch import Patch, fill
 from ... paramgen import arcparam
 INTERVAL = 1
-class DownloadWorker:
+class ExtractWorker:
     """
-    DownloadWorker associates a download session with a block.
+    ExtractWorker associates a download session with a block.
 
-    When the dlworker finishes downloading, the block
-    being downloaded is splitted and assigned the free dlworker.
+    When the worker finishes fetching, the block
+    being fetched is splitted and assigned the free worker.
 
     Parameter
     ----------
     fetch : func :
-        download function of asyncdl
+        extract function of asyncdl
 
     block : Block :
         Block object that includes chat_data
diff --git a/pytchat/util/__init__.py b/pytchat/util/__init__.py
index 60be578..9b9d1ab 100644
--- a/pytchat/util/__init__.py
+++ b/pytchat/util/__init__.py
@@ -1,7 +1,7 @@
 import requests,json,datetime
 from .. import config
 
-def download(url):
+def extract(url):
     _session = requests.Session()
     html = _session.get(url, headers=config.headers)
     with open(str(datetime.datetime.now().strftime('%Y-%m-%d %H-%M-%S')
diff --git a/tests/test_dl_asyncdl.py b/tests/test_extract_asyncdl.py
similarity index 93%
rename from tests/test_dl_asyncdl.py
rename to tests/test_extract_asyncdl.py
index c28b327..2cef81b 100644
--- a/tests/test_dl_asyncdl.py
+++ b/tests/test_extract_asyncdl.py
@@ -1,12 +1,12 @@
 import aiohttp
 import asyncio
 import json
-from pytchat.tool.download import parser
+from pytchat.tool.extract import parser
 import sys
 import time
 from aioresponses import aioresponses
 from concurrent.futures import CancelledError
-from pytchat.tool.download import asyncdl
+from pytchat.tool.extract import asyncdl
 
 def _open_file(path):
     with open(path,mode ='r',encoding = 'utf-8') as f:
diff --git a/tests/test_dl_duplcheck.py b/tests/test_extract_duplcheck.py
similarity index 90%
rename from tests/test_dl_duplcheck.py
rename to tests/test_extract_duplcheck.py
index 67fc00c..92e3897 100644
--- a/tests/test_dl_duplcheck.py
+++ b/tests/test_extract_duplcheck.py
@@ -3,10 +3,10 @@ import asyncio
 import json
 import os, sys
 import time
-from pytchat.tool.download import duplcheck
-from pytchat.tool.download import parser
-from pytchat.tool.download.block import Block
-from pytchat.tool.download.duplcheck import _dump
+from pytchat.tool.extract import duplcheck
+from pytchat.tool.extract import parser
+from pytchat.tool.extract.block import Block
+from pytchat.tool.extract.duplcheck import _dump
 def _open_file(path):
     with open(path,mode ='r',encoding = 'utf-8') as f:
         return f.read()
@@ -23,7 +23,7 @@ def test_overlap():
 
     def load_chatdata(filename):
         return parser.parse(
-            json.loads(_open_file("tests/testdata/dl_duplcheck/overlap/"+filename))
+            json.loads(_open_file("tests/testdata/extract_duplcheck/overlap/"+filename))
         )[1]
 
     blocks = (
@@ -54,7 +54,7 @@ def test_duplicate_head():
 
     def load_chatdata(filename):
         return parser.parse(
-            json.loads(_open_file("tests/testdata/dl_duplcheck/head/"+filename))
+            json.loads(_open_file("tests/testdata/extract_duplcheck/head/"+filename))
         )[1]
 
     """
@@ -103,7 +103,7 @@ def test_duplicate_tail():
     """
     def load_chatdata(filename):
         return parser.parse(
-            json.loads(_open_file("tests/testdata/dl_duplcheck/head/"+filename))
+            json.loads(_open_file("tests/testdata/extract_duplcheck/head/"+filename))
         )[1]
     #chat data offsets are ignored.    
     blocks = (
diff --git a/tests/test_dl_patch.py b/tests/test_extract_patch.py
similarity index 91%
rename from tests/test_dl_patch.py
rename to tests/test_extract_patch.py
index 4f5c208..2766497 100644
--- a/tests/test_dl_patch.py
+++ b/tests/test_extract_patch.py
@@ -4,18 +4,18 @@ import json
 import os, sys
 import time
 from aioresponses import aioresponses
-from pytchat.tool.download import duplcheck
-from pytchat.tool.download import parser
-from pytchat.tool.download.block import Block
-from pytchat.tool.download.patch import Patch, fill, split, set_patch
-from pytchat.tool.download.duplcheck import _dump
+from pytchat.tool.extract import duplcheck
+from pytchat.tool.extract import parser
+from pytchat.tool.extract.block import Block
+from pytchat.tool.extract.patch import Patch, fill, split, set_patch
+from pytchat.tool.extract.duplcheck import _dump
 def _open_file(path):
     with open(path,mode ='r',encoding = 'utf-8') as f:
         return f.read()
 
 def load_chatdata(filename):
         return parser.parse(
-            json.loads(_open_file("tests/testdata/dl_patch/"+filename))
+            json.loads(_open_file("tests/testdata/fetch_patch/"+filename))
         )[1]
 
 
@@ -25,7 +25,7 @@ def test_split_0():
 
     ~~~~~~ before ~~~~~~
 
-     @parent_block  (# = already downloaded)
+     @parent_block  (# = already fetched)
     
      first    last                                     end
        |########----------------------------------------|
@@ -79,11 +79,11 @@ def test_split_1():
     """patch.first <= parent_block.last
 
     While awaiting at run()->asyncdl._fetch()
-    downloading parent_block proceeds, 
+    fetching parent_block proceeds, 
     and parent.block.last exceeds patch.first.
 
     In this case, fetched patch is all discarded,
-    and dlworker searches other processing block again. 
+    and worker searches other processing block again. 
 
     ~~~~~~ before ~~~~~~
 
@@ -135,7 +135,7 @@ def test_split_2():
 
     ~~~~~~ before ~~~~~~
 
-     @parent_block  (# = already downloaded)
+     @parent_block  (# = already fetched)
      first    last                           end (before split)
        |########------------------------------|
     
@@ -163,7 +163,7 @@ def test_split_2():
                           first            last=end |
                             |#################|......   cut extra data.
                                                     ^
-    continuation : None (download complete)
+    continuation : None (extract complete)
 
      @fetched patch                                 
                             |-------- patch --------|
@@ -188,11 +188,11 @@ def test_split_none():
     """patch.last <= parent_block.last
 
     While awaiting at run()->asyncdl._fetch()
-    downloading parent_block proceeds, 
+    fetching parent_block proceeds, 
     and parent.block.last exceeds patch.first.
 
     In this case, fetched patch is all discarded,
-    and dlworker searches other processing block again. 
+    and worker searches other processing block again. 
     
     ~~~~~~ before ~~~~~~
 
diff --git a/tests/test_jsonfile_archiver.py b/tests/test_jsonfile_archiver.py
new file mode 100644
index 0000000..15395a3
--- /dev/null
+++ b/tests/test_jsonfile_archiver.py
@@ -0,0 +1,48 @@
+import json
+from pytchat.processors.jsonfile_archiver import JsonfileArchiver
+from unittest.mock import patch, mock_open
+from tests.testdata.jsonfile_archiver.chat_component import chat_component
+
+def _open_file(path):
+    with open(path,mode ='r',encoding = 'utf-8') as f:
+        return f.read()
+
+def test_checkpath(mocker):
+    processor = JsonfileArchiver("path")
+    mocker.patch('os.path.exists').side_effect = exists_file
+    '''Test no duplicate file.'''
+    assert processor._checkpath("z:/other.txt") == "z:/other.txt"
+    
+    '''Test duplicate filename. 
+    The case the name first renamed ('test.txt -> test(0).txt')
+    is also duplicated.
+    '''
+    assert processor._checkpath("z:/test.txt") == "z:/test(1).txt"
+    
+    '''Test no extention file (duplicate).'''
+    assert processor._checkpath("z:/test") == "z:/test(0)"
+
+
+def test_read_write():
+    '''Test read and write chatdata'''
+    mock = mock_open(read_data = "")
+    with patch('builtins.open',mock):
+        processor = JsonfileArchiver("path")
+        save_path = processor.process([chat_component])
+    fh = mock()
+    actuals = [args[0] for (args, kwargs) in fh.writelines.call_args_list]
+    '''write format is json dump string  with 0x0A'''
+    to_be_written = [json.dumps(action, ensure_ascii=False)+'\n' 
+        for action in chat_component["chatdata"]]
+    for i in range(len(actuals)):
+        assert actuals[i] == to_be_written[i]
+    assert save_path == {'save_path': 'path', 'total_lines': 7}    
+
+
+def exists_file(path):
+    if path == "z:/test.txt":
+        return True
+    if path == "z:/test(0).txt":
+        return True
+    if path == "z:/test":
+        return True
diff --git a/tests/testdata/dl_duplcheck/head/dp0-0.json b/tests/testdata/extract_duplcheck/head/dp0-0.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/head/dp0-0.json
rename to tests/testdata/extract_duplcheck/head/dp0-0.json
diff --git a/tests/testdata/dl_duplcheck/head/dp0-1.json b/tests/testdata/extract_duplcheck/head/dp0-1.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/head/dp0-1.json
rename to tests/testdata/extract_duplcheck/head/dp0-1.json
diff --git a/tests/testdata/dl_duplcheck/head/dp0-2.json b/tests/testdata/extract_duplcheck/head/dp0-2.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/head/dp0-2.json
rename to tests/testdata/extract_duplcheck/head/dp0-2.json
diff --git a/tests/testdata/dl_duplcheck/head/dp0-3.json b/tests/testdata/extract_duplcheck/head/dp0-3.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/head/dp0-3.json
rename to tests/testdata/extract_duplcheck/head/dp0-3.json
diff --git a/tests/testdata/dl_duplcheck/head/dp0-4.json b/tests/testdata/extract_duplcheck/head/dp0-4.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/head/dp0-4.json
rename to tests/testdata/extract_duplcheck/head/dp0-4.json
diff --git a/tests/testdata/dl_duplcheck/head/dp0-5.json b/tests/testdata/extract_duplcheck/head/dp0-5.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/head/dp0-5.json
rename to tests/testdata/extract_duplcheck/head/dp0-5.json
diff --git a/tests/testdata/dl_duplcheck/overlap/dp0-0.json b/tests/testdata/extract_duplcheck/overlap/dp0-0.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/overlap/dp0-0.json
rename to tests/testdata/extract_duplcheck/overlap/dp0-0.json
diff --git a/tests/testdata/dl_duplcheck/overlap/dp0-1.json b/tests/testdata/extract_duplcheck/overlap/dp0-1.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/overlap/dp0-1.json
rename to tests/testdata/extract_duplcheck/overlap/dp0-1.json
diff --git a/tests/testdata/dl_duplcheck/overlap/dp0-2.json b/tests/testdata/extract_duplcheck/overlap/dp0-2.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/overlap/dp0-2.json
rename to tests/testdata/extract_duplcheck/overlap/dp0-2.json
diff --git a/tests/testdata/dl_duplcheck/overlap/dp0-3.json b/tests/testdata/extract_duplcheck/overlap/dp0-3.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/overlap/dp0-3.json
rename to tests/testdata/extract_duplcheck/overlap/dp0-3.json
diff --git a/tests/testdata/dl_duplcheck/overlap/dp0-4.json b/tests/testdata/extract_duplcheck/overlap/dp0-4.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/overlap/dp0-4.json
rename to tests/testdata/extract_duplcheck/overlap/dp0-4.json
diff --git a/tests/testdata/dl_duplcheck/overlap/dp0-5.json b/tests/testdata/extract_duplcheck/overlap/dp0-5.json
similarity index 100%
rename from tests/testdata/dl_duplcheck/overlap/dp0-5.json
rename to tests/testdata/extract_duplcheck/overlap/dp0-5.json
diff --git a/tests/testdata/dl_patch/pt0-0.json b/tests/testdata/fetch_patch/pt0-0.json
similarity index 100%
rename from tests/testdata/dl_patch/pt0-0.json
rename to tests/testdata/fetch_patch/pt0-0.json
diff --git a/tests/testdata/dl_patch/pt0-1.json b/tests/testdata/fetch_patch/pt0-1.json
similarity index 100%
rename from tests/testdata/dl_patch/pt0-1.json
rename to tests/testdata/fetch_patch/pt0-1.json
diff --git a/tests/testdata/dl_patch/pt0-3.json b/tests/testdata/fetch_patch/pt0-3.json
similarity index 100%
rename from tests/testdata/dl_patch/pt0-3.json
rename to tests/testdata/fetch_patch/pt0-3.json
diff --git a/tests/testdata/dl_patch/pt0-4.json b/tests/testdata/fetch_patch/pt0-4.json
similarity index 100%
rename from tests/testdata/dl_patch/pt0-4.json
rename to tests/testdata/fetch_patch/pt0-4.json
diff --git a/tests/testdata/dl_patch/pt0-5.json b/tests/testdata/fetch_patch/pt0-5.json
similarity index 100%
rename from tests/testdata/dl_patch/pt0-5.json
rename to tests/testdata/fetch_patch/pt0-5.json
diff --git a/tests/testdata/jsonfile_archiver/chat_component.py b/tests/testdata/jsonfile_archiver/chat_component.py
new file mode 100644
index 0000000..435bcce
--- /dev/null
+++ b/tests/testdata/jsonfile_archiver/chat_component.py
@@ -0,0 +1,487 @@
+chat_component =      {
+       "video_id" : "video_id",
+       "timeout" : 10,
+       "chatdata": [
+          {
+            "addChatItemAction": {
+              "item": {
+                "liveChatTextMessageRenderer": {
+                  "message": {
+                    "runs": [
+                      {
+                        "text": "This is normal message."
+                      }
+                    ]
+                  },
+                  "authorName": {
+                    "simpleText": "author_name"
+                  },
+                  "authorPhoto": {
+                    "thumbnails": [
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 32,
+                        "height": 32
+                      },
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 64,
+                        "height": 64
+                      }
+                    ]
+                  },
+                  "contextMenuEndpoint": {
+                    "commandMetadata": {
+                      "webCommandMetadata": {
+                        "ignoreNavigation": True
+                      }
+                    },
+                    "liveChatItemContextMenuEndpoint": {
+                      "params": "___params___"
+                    }
+                  },
+                  "id": "dummy_id",
+                  "timestampUsec": 0,
+                  "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                  "contextMenuAccessibility": {
+                    "accessibilityData": {
+                      "label": "コメントの操作"
+                    }
+                  }
+                }
+              },
+              "clientId": "dummy_client_id"
+            }
+          },
+          {
+            "addChatItemAction": {
+              "item": {
+                "liveChatTextMessageRenderer": {
+                  "message": {
+                    "runs": [
+                      {
+                        "text": "This is members's message"
+                      }
+                    ]
+                  },
+                  "authorName": {
+                    "simpleText": "author_name"
+                  },
+                  "authorPhoto": {
+                    "thumbnails": [
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 32,
+                        "height": 32
+                      },
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 64,
+                        "height": 64
+                      }
+                    ]
+                  },
+                  "contextMenuEndpoint": {
+                    "commandMetadata": {
+                      "webCommandMetadata": {
+                        "ignoreNavigation": True
+                      }
+                    },
+                    "liveChatItemContextMenuEndpoint": {
+                      "params": "___params___"
+                    }
+                  },
+                  "id": "dummy_id",
+                  "timestampUsec": 0,
+                  "authorBadges": [
+                    {
+                      "liveChatAuthorBadgeRenderer": {
+                        "customThumbnail": {
+                          "thumbnails": [
+                            {
+                              "url": "https://yt3.ggpht.com/X=s32-c-k"
+                            },
+                            {
+                              "url": "https://yt3.ggpht.com/X=s32-c-k"
+                            }
+                          ]
+                        },
+                        "tooltip": "メンバー（2 か月）",
+                        "accessibility": {
+                          "accessibilityData": {
+                            "label": "メンバー（2 か月）"
+                          }
+                        }
+                      }
+                    }
+                  ],
+                  "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                  "contextMenuAccessibility": {
+                    "accessibilityData": {
+                      "label": "コメントの操作"
+                    }
+                  }
+                }
+              },
+              "clientId": "dummy_client_id"
+            }
+          },
+          {
+            "addChatItemAction": {
+              "item": {
+                "liveChatPlaceholderItemRenderer": {
+                  "id": "dummy_id",
+                  "timestampUsec": 0
+                }
+              },
+              "clientId": "dummy_client_id"
+            }
+          },
+          {
+            "addLiveChatTickerItemAction": {
+              "item": {
+                "liveChatTickerPaidMessageItemRenderer": {
+                  "id": "dummy_id",
+                  "amount": {
+                    "simpleText": "￥10,000"
+                  },
+                  "amountTextColor": 4294967295,
+                  "startBackgroundColor": 4293271831,
+                  "endBackgroundColor": 4291821568,
+                  "authorPhoto": {
+                    "thumbnails": [
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 32,
+                        "height": 32
+                      },
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 64,
+                        "height": 64
+                      }
+                    ]
+                  },
+                  "durationSec": 3600,
+                  "showItemEndpoint": {
+                    "commandMetadata": {
+                      "webCommandMetadata": {
+                        "ignoreNavigation": True
+                      }
+                    },
+                    "showLiveChatItemEndpoint": {
+                      "renderer": {
+                        "liveChatPaidMessageRenderer": {
+                          "id": "dummy_id",
+                          "timestampUsec": 0,
+                          "authorName": {
+                            "simpleText": "author_name"
+                          },
+                          "authorPhoto": {
+                            "thumbnails": [
+                              {
+                                "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                                "width": 32,
+                                "height": 32
+                              },
+                              {
+                                "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                                "width": 64,
+                                "height": 64
+                              }
+                            ]
+                          },
+                          "purchaseAmountText": {
+                            "simpleText": "￥10,000"
+                          },
+                          "message": {
+                            "runs": [
+                              {
+                                "text": "This is superchat message."
+                              }
+                            ]
+                          },
+                          "headerBackgroundColor": 4291821568,
+                          "headerTextColor": 4294967295,
+                          "bodyBackgroundColor": 4293271831,
+                          "bodyTextColor": 4294967295,
+                          "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                          "authorNameTextColor": 3019898879,
+                          "contextMenuEndpoint": {
+                            "commandMetadata": {
+                              "webCommandMetadata": {
+                                "ignoreNavigation": True
+                              }
+                            },
+                            "liveChatItemContextMenuEndpoint": {
+                              "params": "___params___"
+                            }
+                          },
+                          "timestampColor": 2164260863,
+                          "contextMenuAccessibility": {
+                            "accessibilityData": {
+                              "label": "コメントの操作"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                  "fullDurationSec": 3600
+                }
+              },
+              "durationSec": "3600"
+            }
+          },
+          {
+            "addChatItemAction": {
+              "item": {
+                "liveChatPaidMessageRenderer": {
+                  "id": "dummy_id",
+                  "timestampUsec": 0,
+                  "authorName": {
+                    "simpleText": "author_name"
+                  },
+                  "authorPhoto": {
+                    "thumbnails": [
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 32,
+                        "height": 32
+                      },
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 64,
+                        "height": 64
+                      }
+                    ]
+                  },
+                  "purchaseAmountText": {
+                    "simpleText": "￥10,800"
+                  },
+                  "message": {
+                    "runs": [
+                      {
+                        "text": "This is superchat message."
+                      }
+                    ]
+                  },
+                  "headerBackgroundColor": 4291821568,
+                  "headerTextColor": 4294967295,
+                  "bodyBackgroundColor": 4293271831,
+                  "bodyTextColor": 4294967295,
+                  "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                  "authorNameTextColor": 3019898879,
+                  "contextMenuEndpoint": {
+                    "commandMetadata": {
+                      "webCommandMetadata": {
+                        "ignoreNavigation": True
+                      }
+                    },
+                    "liveChatItemContextMenuEndpoint": {
+                      "params": "___params___"
+                    }
+                  },
+                  "timestampColor": 2164260863,
+                  "contextMenuAccessibility": {
+                    "accessibilityData": {
+                      "label": "コメントの操作"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          {
+            "addChatItemAction": {
+              "item": {
+                "liveChatPaidStickerRenderer": {
+                  "id": "dummy_id",
+                  "contextMenuEndpoint": {
+                    "clickTrackingParams": "___clickTrackingParams___",
+                    "commandMetadata": {
+                      "webCommandMetadata": {
+                        "ignoreNavigation": True
+                      }
+                    },
+                    "liveChatItemContextMenuEndpoint": {
+                      "params": "___params___"
+                    }
+                  },
+                  "contextMenuAccessibility": {
+                    "accessibilityData": {
+                      "label": "コメントの操作"
+                    }
+                  },
+                  "timestampUsec": 0,
+                  "authorPhoto": {
+                    "thumbnails": [
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 32,
+                        "height": 32
+                      },
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 64,
+                        "height": 64
+                      }
+                    ]
+                  },
+                  "authorName": {
+                    "simpleText": "author_name"
+                  },
+                  "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                  "sticker": {
+                    "thumbnails": [
+                      {
+                        "url": "//lh3.googleusercontent.com/param_s=s40-rp",
+                        "width": 40,
+                        "height": 40
+                      },
+                      {
+                        "url": "//lh3.googleusercontent.com/param_s=s80-rp",
+                        "width": 80,
+                        "height": 80
+                      }
+                    ],
+                    "accessibility": {
+                      "accessibilityData": {
+                        "label": "___sticker_label___"
+                      }
+                    }
+                  },
+                  "moneyChipBackgroundColor": 4280191205,
+                  "moneyChipTextColor": 4294967295,
+                  "purchaseAmountText": {
+                    "simpleText": "￥150"
+                  },
+                  "stickerDisplayWidth": 40,
+                  "stickerDisplayHeight": 40,
+                  "backgroundColor": 4279592384,
+                  "authorNameTextColor": 3019898879,
+                  "trackingParams": "___trackingParams___"
+                }
+              }
+            }
+          },
+          {
+            "addLiveChatTickerItemAction": {
+              "item": {
+                "liveChatTickerSponsorItemRenderer": {
+                  "id": "dummy_id",
+                  "detailText": {
+                    "runs": [
+                      {
+                        "text": "メンバー"
+                      }
+                    ]
+                  },
+                  "detailTextColor": 4294967295,
+                  "startBackgroundColor": 4279213400,
+                  "endBackgroundColor": 4278943811,
+                  "sponsorPhoto": {
+                    "thumbnails": [
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 32,
+                        "height": 32
+                      },
+                      {
+                        "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                        "width": 64,
+                        "height": 64
+                      }
+                    ]
+                  },
+                  "durationSec": 300,
+                  "showItemEndpoint": {
+                    "commandMetadata": {
+                      "webCommandMetadata": {
+                        "ignoreNavigation": True
+                      }
+                    },
+                    "showLiveChatItemEndpoint": {
+                      "renderer": {
+                        "liveChatMembershipItemRenderer": {
+                          "id": "dummy_id",
+                          "timestampUsec": 0,
+                          "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                          "headerSubtext": {
+                            "runs": [
+                              {
+                                "text": "メンバーシップ"
+                              },
+                              {
+                                "text": " へようこそ！"
+                              }
+                            ]
+                          },
+                          "authorName": {
+                            "simpleText": "author_name"
+                          },
+                          "authorPhoto": {
+                            "thumbnails": [
+                              {
+                                "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                                "width": 32,
+                                "height": 32
+                              },
+                              {
+                                "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+                                "width": 64,
+                                "height": 64
+                              }
+                            ]
+                          },
+                          "authorBadges": [
+                            {
+                              "liveChatAuthorBadgeRenderer": {
+                                "customThumbnail": {
+                                  "thumbnails": [
+                                    {
+                                      "url": "https://yt3.ggpht.com/X=s32-c-k"
+                                    },
+                                    {
+                                      "url": "https://yt3.ggpht.com/X=s32-c-k"
+                                    }
+                                  ]
+                                },
+                                "tooltip": "新規メンバー",
+                                "accessibility": {
+                                  "accessibilityData": {
+                                    "label": "新規メンバー"
+                                  }
+                                }
+                              }
+                            }
+                          ],
+                          "contextMenuEndpoint": {
+                            "commandMetadata": {
+                              "webCommandMetadata": {
+                                "ignoreNavigation": True
+                              }
+                            },
+                            "liveChatItemContextMenuEndpoint": {
+                              "params": "___params___"
+                            }
+                          },
+                          "contextMenuAccessibility": {
+                            "accessibilityData": {
+                              "label": "コメントの操作"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+                  "fullDurationSec": 300
+                }
+              },
+              "durationSec": "300"
+            }
+          }
+        ]
+      }
diff --git a/tests/testdata/jsonfile_archiver/replay_end.json b/tests/testdata/jsonfile_archiver/replay_end.json
new file mode 100644
index 0000000..368bbf4
--- /dev/null
+++ b/tests/testdata/jsonfile_archiver/replay_end.json
@@ -0,0 +1,18 @@
+{
+ "response": {
+  "responseContext": {
+   "webResponseContextExtensionData": ""
+  },
+  "continuationContents": {
+   "liveChatContinuation": {
+    "continuations": [
+     {
+      "playerSeekContinuationData": {
+       "continuation": "___reload_continuation___"
+      }
+     }
+    ]
+   }
+  }
+ }
+}
\ No newline at end of file
diff --git a/tests/testdata/jsonfile_archiver/text_only.json b/tests/testdata/jsonfile_archiver/text_only.json
new file mode 100644
index 0000000..d83bbc3
--- /dev/null
+++ b/tests/testdata/jsonfile_archiver/text_only.json
@@ -0,0 +1,89 @@
+{
+ "response": {
+  "responseContext": {
+   "webResponseContextExtensionData": ""
+  },
+  "continuationContents": {
+   "liveChatContinuation": {
+    "continuations": [
+     {
+      "invalidationContinuationData": {
+       "invalidationId": {
+        "objectSource": 1000,
+        "objectId": "___objectId___",
+        "topic": "chat~00000000000~0000000",
+        "subscribeToGcmTopics": true,
+        "protoCreationTimestampMs": "1577804400000"
+       },
+       "timeoutMs": 10000,
+       "continuation": "___continuation___"
+      }
+     }
+    ],
+    "actions": [
+     {
+      "replayChatItemAction": {
+       "actions": [
+        {
+         "addChatItemAction": {
+          "item": {
+           "liveChatTextMessageRenderer": {
+            "message": {
+             "runs": [
+              {
+               "text": "dummy_message"
+              }
+             ]
+            },
+            "authorName": {
+             "simpleText": "author_name"
+            },
+            "authorPhoto": {
+             "thumbnails": [
+              {
+               "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+               "width": 32,
+               "height": 32
+              },
+              {
+               "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
+               "width": 64,
+               "height": 64
+              }
+             ]
+            },
+            "contextMenuEndpoint": {
+             "commandMetadata": {
+              "webCommandMetadata": {
+               "ignoreNavigation": true
+              }
+             },
+             "liveChatItemContextMenuEndpoint": {
+              "params": "___params___"
+             }
+            },
+            "id": "dummy_id",
+            "timestampUsec": 0,
+            "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
+            "contextMenuAccessibility": {
+             "accessibilityData": {
+              "label": "コメントの操作"
+             }
+            },
+            "timestampText": {
+             "simpleText": "0:00"
+            }
+           }
+          },
+          "clientId": "dummy_client_id"
+         }
+        }
+       ],
+       "videoOffsetTimeMsec": "10000"
+      }
+     }
+    ]
+   }
+  }
+ }
+}
\ No newline at end of file