Fixed #36177 -- Added a trailing newline to JSON serializer. (#19232)

.editorconfig

@@ -18,11 +18,6 @@ max_line_length = 88
 [*.html]
 indent_size = 2
 
-# The JSON files contain newlines inconsistently
-[*.json]
-indent_size = 2
-insert_final_newline = ignore
-
 [**/admin/js/vendor/**]
 indent_style = ignore
 indent_size = ignore

django/core/serializers/json.py

@@ -39,7 +39,6 @@ class Serializer(PythonSerializer):
         if self.options.get("indent"):
             self.stream.write("\n")
         self.stream.write("]")
-        if self.options.get("indent"):
         self.stream.write("\n")
 
     def end_object(self, obj):

docs/releases/6.0.txt

@@ -293,7 +293,8 @@ of each library are the first to add or confirm compatibility with Python 3.12:
 Miscellaneous
 -------------
 
-* ...
+* The :ref:`JSON <serialization-formats-json>` serializer now writes a newline
+  at the end of the output, even without the ``indent`` option set.
 
 .. _deprecated-features-6.0:
 

tests/serializers/tests.py

@@ -489,7 +489,8 @@ class SerializerAPITests(SimpleTestCase):
         self.assertIs(serializer.stream_class, File)
         self.assertIsInstance(serializer.stream, File)
         self.assertEqual(
-            data, '[{"model": "serializers.score", "pk": 1, "fields": {"score": 3.4}}]'
+            data,
+            '[{"model": "serializers.score", "pk": 1, "fields": {"score": 3.4}}]\n',
         )