[utils] Drop trailing comma before closing brace

test/test_utils.py

@@ -470,6 +470,12 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(d['x'], 1)
         self.assertEqual(d['y'], 'a')
 
+        on = js_to_json('["abc", "def",]')
+        self.assertEqual(json.loads(on), ['abc', 'def'])
+
+        on = js_to_json('{"abc": "def",}')
+        self.assertEqual(json.loads(on), {'abc': 'def'})
+
     def test_clean_html(self):
         self.assertEqual(clean_html('a:\nb'), 'a: b')
         self.assertEqual(clean_html('a:\n   "b"'), 'a:    "b"')

youtube_dl/utils.py

@@ -1577,7 +1577,7 @@ def js_to_json(code):
         '(?:[^'\\]*(?:\\\\|\\['"nu]))*[^'\\]*'|
         [a-zA-Z_][.a-zA-Z_0-9]*
         ''', fix_kv, code)
-    res = re.sub(r',(\s*\])', lambda m: m.group(1), res)
+    res = re.sub(r',(\s*[\]}])', lambda m: m.group(1), res)
     return res