diff --git a/nhentai/serializer.py b/nhentai/serializer.py
index 357da6c..d8f795a 100644
--- a/nhentai/serializer.py
+++ b/nhentai/serializer.py
@@ -2,26 +2,28 @@
 import json
 import os
 
+
 def serialize(doujinshi, dir):
-    metadata = {'title'    : doujinshi.name,
-                'subtitle' : doujinshi.info.subtitle}
+    metadata = {'title': doujinshi.name,
+                'subtitle': doujinshi.info.subtitle}
     if doujinshi.info.date:
         metadata['upload_date'] = doujinshi.info.date
     if doujinshi.info.parodies:
-        metadata['parody']    = [i.strip() for i in doujinshi.info.parodies.split(',')]
+        metadata['parody'] = [i.strip() for i in doujinshi.info.parodies.split(',')]
     if doujinshi.info.characters:
-        metadata['character']  = [i.strip() for i in doujinshi.info.characters.split(',')]
+        metadata['character'] = [i.strip() for i in doujinshi.info.characters.split(',')]
     if doujinshi.info.tags:
-        metadata['tag']        = [i.strip() for i in doujinshi.info.tags.split(',')]
+        metadata['tag'] = [i.strip() for i in doujinshi.info.tags.split(',')]
     if doujinshi.info.artists:
-        metadata['artist']     = [i.strip() for i in doujinshi.info.artists.split(',')]
+        metadata['artist'] = [i.strip() for i in doujinshi.info.artists.split(',')]
     if doujinshi.info.groups:
-        metadata['group']      = [i.strip() for i in doujinshi.info.groups.split(',')]
+        metadata['group'] = [i.strip() for i in doujinshi.info.groups.split(',')]
     if doujinshi.info.languages:
-        metadata['language']   = [i.strip() for i in doujinshi.info.languages.split(',')]
-    metadata['category']      = doujinshi.info.categories
-    metadata['URL']             = doujinshi.url
-    metadata['Pages']           = doujinshi.pages
+        metadata['language'] = [i.strip() for i in doujinshi.info.languages.split(',')]
+    metadata['category'] = doujinshi.info.categories
+    metadata['URL'] = doujinshi.url
+    metadata['Pages'] = doujinshi.pages
+
     with open(os.path.join(dir, 'metadata.json'), 'w', encoding="raw_unicode_escape") as f:
         json.dump(metadata, f, separators=','':')
 
@@ -37,7 +39,6 @@ def merge_json():
             continue
         data_folder = output_dir + folder + '/' + 'metadata.json'
         json_file = open(data_folder, 'r')
-        json_dict = {}
         json_dict = json.load(json_file)
         json_dict['Folder'] = folder
         lst.append(json_dict)
@@ -75,5 +76,5 @@ def set_js_database():
         indexed_json = merge_json()
         unique_json = json.dumps(serialize_unique(indexed_json), separators=','':')
         indexed_json = json.dumps(indexed_json, separators=','':')
-        f.write('var data = '+indexed_json)
-        f.write(';\nvar tags = '+unique_json)
+        f.write('var data = ' + indexed_json)
+        f.write(';\nvar tags = ' + unique_json)