diff --git a/django/db/backends/base/features.py b/django/db/backends/base/features.py
index 5a27aa9f174..be949423b00 100644
--- a/django/db/backends/base/features.py
+++ b/django/db/backends/base/features.py
@@ -314,6 +314,9 @@ class BaseDatabaseFeatures:
     # Does the backend support __contains and __contained_by lookups for
     # a JSONField?
     supports_json_field_contains = True
+    # Does value__d__contains={'f': 'g'} (without a list around the dict) match
+    # {'d': [{'f': 'g'}]}?
+    json_key_contains_list_matching_requires_list = False
 
     def __init__(self, connection):
         self.connection = connection
diff --git a/django/db/backends/postgresql/features.py b/django/db/backends/postgresql/features.py
index a9b9ca578a8..58a84a6c339 100644
--- a/django/db/backends/postgresql/features.py
+++ b/django/db/backends/postgresql/features.py
@@ -59,6 +59,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     validates_explain_options = False  # A query will error on invalid options.
     supports_deferrable_unique_constraints = True
     has_json_operators = True
+    json_key_contains_list_matching_requires_list = True
 
     @cached_property
     def is_postgresql_9_6(self):
diff --git a/tests/model_fields/test_jsonfield.py b/tests/model_fields/test_jsonfield.py
index fa6e9e2a341..26643adcdd7 100644
--- a/tests/model_fields/test_jsonfield.py
+++ b/tests/model_fields/test_jsonfield.py
@@ -699,8 +699,9 @@ class TestQuerying(TestCase):
                 )),
             ),
         ]
-        # PostgreSQL requires a layer of nesting.
-        if connection.vendor != 'postgresql':
+        # For databases where {'f': 'g'} (without surrounding []) matches
+        # [{'f': 'g'}].
+        if not connection.features.json_key_contains_list_matching_requires_list:
             tests.append(('value__d__contains', {'f': 'g'}))
         for lookup, value in tests:
             with self.subTest(lookup=lookup, value=value):