diff --git a/lib/galaxy/schema/workflows.py b/lib/galaxy/schema/workflows.py
index 1aa13662d336..ae14c3a39096 100644
--- a/lib/galaxy/schema/workflows.py
+++ b/lib/galaxy/schema/workflows.py
@@ -97,19 +97,19 @@ class InvokeWorkflowPayload(GetTargetHistoryPayload):
     allow_tool_state_corrections: Optional[bool] = False
     use_cached_job: Optional[bool] = False
     step_parameters: Optional[Dict[str, Any]] = None
+
     # input_step_parameters: Dict[str, InvocationInputParameter] = Field(
     #     default=..., title="Input step parameters", description="Input step parameters of the workflow invocation."
     # )
-    parameters: Optional[Dict[str, Any]] = None
-    inputs: Optional[Dict[str, Any]] = None
-
-    @field_validator("ds_map", mode="before", check_fields=False)
+    @field_validator("ds_map", "parameters", "inputs", mode="before", check_fields=False)
     @classmethod
     def inputs_string_to_json(cls, v):
         if isinstance(v, str):
             return json.loads(v)
         return v
 
+    parameters: Optional[Dict[str, Any]] = None
+    inputs: Optional[Dict[str, Any]] = None
     ds_map: Optional[Dict[str, Dict[str, Any]]] = None
     no_add_to_history: Optional[bool] = False
     legacy: Optional[bool] = False