diff --git a/.gitignore b/.gitignore
index 735ef5c..e58cbb8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ __pycache__/
 /docs-build
 /dist
 /build
+/src/descanso/_version.py
 
 # well known common utilities
 .idea/
diff --git a/src/descanso/jsonrpc.py b/src/descanso/jsonrpc.py
index ff1fc9a..2dcbd0b 100644
--- a/src/descanso/jsonrpc.py
+++ b/src/descanso/jsonrpc.py
@@ -175,11 +175,12 @@ def transform_request(
     ) -> HttpRequest:
         request_id = get_extra(request, EXTRA_JSON_RPC_REQUEST_ID)
         method = get_extra(request, EXTRA_JSON_RPC_METHOD)
+        params = {"params": request.body} if request.body is not None else {}
         request.body = {
             "jsonrpc": "2.0",
             "id": request_id,
             "method": method,
-            "params": request.body,
+            **params,
         }
         return request
 
diff --git a/src/descanso/rest_builder.py b/src/descanso/rest_builder.py
index 84d14dc..4f4ffd9 100644
--- a/src/descanso/rest_builder.py
+++ b/src/descanso/rest_builder.py
@@ -47,7 +47,7 @@
 _MethodParamSpec = ParamSpec("_MethodParamSpec")
 
 
-class BuilderParams(TypedDict):
+class BuilderParams(TypedDict, total=False):
     body_name: str
 
     query_param_dumper: Dumper | None
diff --git a/tests/request_transformers/test_jsonrpc.py b/tests/request_transformers/test_jsonrpc.py
new file mode 100644
index 0000000..963c359
--- /dev/null
+++ b/tests/request_transformers/test_jsonrpc.py
@@ -0,0 +1,49 @@
+from descanso.jsonrpc import (
+    EXTRA_JSON_RPC_METHOD,
+    EXTRA_JSON_RPC_REQUEST_ID,
+    PackJsonRPC,
+)
+from descanso.request import HttpRequest
+
+
+def test_empty_body_omit_params() -> None:
+    request = HttpRequest(
+        extras=[
+            (EXTRA_JSON_RPC_REQUEST_ID, "some_id"),
+            (EXTRA_JSON_RPC_METHOD, "some_method"),
+        ],
+        method="POST",
+    )
+    expected_body = {
+        "id": "some_id",
+        "method": "some_method",
+        "jsonrpc": "2.0",
+    }
+
+    transformer = PackJsonRPC()
+    result_request = transformer.transform_request(request, [], [], {})
+
+    assert result_request.body == expected_body
+
+
+def test_body_set_in_params() -> None:
+    params = {"param1": "value1", "param2": "value2"}
+    request = HttpRequest(
+        body=params,
+        extras=[
+            (EXTRA_JSON_RPC_REQUEST_ID, "some_id"),
+            (EXTRA_JSON_RPC_METHOD, "some_method"),
+        ],
+        method="POST",
+    )
+    expected_body = {
+        "id": "some_id",
+        "method": "some_method",
+        "jsonrpc": "2.0",
+        "params": params,
+    }
+
+    transformer = PackJsonRPC()
+    result_request = transformer.transform_request(request, [], [], {})
+
+    assert result_request.body == expected_body