From 35bd1bd1b451d6f808185a0a4a4d129e09e282d5 Mon Sep 17 00:00:00 2001
From: mayureshsonawane17 <mayureshsonawane668@gmail.com>
Date: Mon, 5 Oct 2026 15:28:17 +0530
Subject: [PATCH] fix: preserve falsy scalar JSON primitives in
 json_params_matcher (#834)

---
 responses/matchers.py            |  2 +-
 responses/tests/test_matchers.py | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/responses/matchers.py b/responses/matchers.py
index 15df1884..552f98f2 100644
--- a/responses/matchers.py
+++ b/responses/matchers.py
@@ -135,7 +135,7 @@ def json_params_matcher(
     def match(request: PreparedRequest) -> Tuple[bool, str]:
         reason = ""
         request_body = request.body
-        json_params = (params or {}) if not isinstance(params, list) else params
+        json_params = {} if params is None else params
         try:
             if isinstance(request.body, bytes):
                 try:
diff --git a/responses/tests/test_matchers.py b/responses/tests/test_matchers.py
index 4f67810c..e3c09a47 100644
--- a/responses/tests/test_matchers.py
+++ b/responses/tests/test_matchers.py
@@ -272,6 +272,23 @@ def test_json_params_matcher_body_is_gzipped():
     assert result == (True, "")
 
 
+@pytest.mark.parametrize(
+    ("param", "body_str"),
+    [
+        (0, "0"),
+        (False, "false"),
+        ("", '""'),
+        (0.0, "0.0"),
+        (True, "true"),
+        ("hello", '"hello"'),
+    ],
+)
+def test_json_params_matcher_primitives(param, body_str):
+    mock_request = Mock(body=body_str)
+    result = matchers.json_params_matcher(param)(mock_request)
+    assert result == (True, "")
+
+
 def test_urlencoded_params_matcher_blank():
     @responses.activate
     def run():