diff --git a/test/test_utils.py b/test/test_utils.py
index a74d59f34..954bb7d8b 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -791,6 +791,9 @@ class TestUtil(unittest.TestCase):
         on = js_to_json('{ 0: /* " \n */ ",]" , }')
         self.assertEqual(json.loads(on), {'0': ',]'})
 
+        on = js_to_json('{ 0: // comment\n1 }')
+        self.assertEqual(json.loads(on), {'0': 1})
+
         on = js_to_json(r'["<p>x<\/p>"]')
         self.assertEqual(json.loads(on), ['<p>x</p>'])
 
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index cf46711b9..6c462625b 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2107,7 +2107,7 @@ def js_to_json(code):
         v = m.group(0)
         if v in ('true', 'false', 'null'):
             return v
-        elif v.startswith('/*') or v == ',':
+        elif v.startswith('/*') or v.startswith('//') or v == ',':
             return ""
 
         if v[0] in ("'", '"'):
@@ -2134,7 +2134,7 @@ def js_to_json(code):
     return re.sub(r'''(?sx)
         "(?:[^"\\]*(?:\\\\|\\['"nurtbfx/\n]))*[^"\\]*"|
         '(?:[^'\\]*(?:\\\\|\\['"nurtbfx/\n]))*[^'\\]*'|
-        /\*.*?\*/|,(?=\s*[\]}])|
+        /\*.*?\*/|//[^\n]*|,(?=\s*[\]}])|
         [a-zA-Z_][.a-zA-Z_0-9]*|
         \b(?:0[xX][0-9a-fA-F]+|0+[0-7]+)(?:\s*:)?|
         [0-9]+(?=\s*:)