From: Muhammad Bin  Gulzar <75139794+MBGrao@users.noreply.github.com>
Date: Tue, 28 Jul 2026 12:28:18 +0000 (+0500)
Subject: 🐛 Fix `exclude_defaults` not propagated to dict keys and values in `jsonable_encoder... 
X-Git-Tag: 0.140.9~2
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=aadfcce76380ab169fe172d5cda21722e53c4924;p=thirdparty%2Ffastapi%2Ffastapi.git

🐛 Fix `exclude_defaults` not propagated to dict keys and values in `jsonable_encoder` (#16043)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
---

diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index c9f882d2ba..e578768dac 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -299,6 +299,7 @@ def jsonable_encoder(
                     key,
                     by_alias=by_alias,
                     exclude_unset=exclude_unset,
+                    exclude_defaults=exclude_defaults,
                     exclude_none=exclude_none,
                     custom_encoder=custom_encoder,
                     sqlalchemy_safe=sqlalchemy_safe,
@@ -307,6 +308,7 @@ def jsonable_encoder(
                     value,
                     by_alias=by_alias,
                     exclude_unset=exclude_unset,
+                    exclude_defaults=exclude_defaults,
                     exclude_none=exclude_none,
                     custom_encoder=custom_encoder,
                     sqlalchemy_safe=sqlalchemy_safe,
diff --git a/tests/test_jsonable_encoder.py b/tests/test_jsonable_encoder.py
index 8f8bd3fcbb..96dc49a683 100644
--- a/tests/test_jsonable_encoder.py
+++ b/tests/test_jsonable_encoder.py
@@ -202,6 +202,20 @@ def test_encode_model_with_default():
     }
 
 
+def test_encode_model_with_default_in_dict_and_list():
+    model = ModelWithDefault(foo="foo", bar="bar")
+    assert jsonable_encoder([model], exclude_defaults=True) == [{"foo": "foo"}]
+    assert jsonable_encoder({"key": model}, exclude_defaults=True) == {
+        "key": {"foo": "foo"}
+    }
+    assert jsonable_encoder({"key": [model]}, exclude_defaults=True) == {
+        "key": [{"foo": "foo"}]
+    }
+    assert jsonable_encoder({"key": model}) == {
+        "key": {"foo": "foo", "bar": "bar", "bla": "bla"}
+    }
+
+
 def test_custom_encoders():
     class safe_datetime(datetime):
         pass