diff --git a/qualibrate_runner/api/routes/submit.py b/qualibrate_runner/api/routes/submit.py
index 52b7570..3373768 100644
--- a/qualibrate_runner/api/routes/submit.py
+++ b/qualibrate_runner/api/routes/submit.py
@@ -22,6 +22,7 @@
     run_workflow,
     validate_input_parameters,
 )
+from qualibrate_runner.core.types_parsing import types_conversion
 
 submit_router = APIRouter(prefix="/submit")
 
@@ -43,10 +44,13 @@ def submit_node_run(
             status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
             detail="Already running",
         )
+    converted_parameters = types_conversion(
+        input_parameters, node.parameters_class.serialize()
+    )
     validate_input_parameters(
-        cast(Type[BaseModel], node.parameters_class), input_parameters
+        cast(Type[BaseModel], node.parameters_class), converted_parameters
     )
-    background_tasks.add_task(run_node, node, input_parameters, state)
+    background_tasks.add_task(run_node, node, converted_parameters, state)
     return f"Node job {node.name} is submitted"
 
 
diff --git a/qualibrate_runner/core/run_job.py b/qualibrate_runner/core/run_job.py
index cac5f93..35e003f 100644
--- a/qualibrate_runner/core/run_job.py
+++ b/qualibrate_runner/core/run_job.py
@@ -10,7 +10,6 @@
 
 from qualibrate_runner.config import State
 from qualibrate_runner.core.models.last_run import LastRun, RunError, RunStatus
-from qualibrate_runner.core.types_parsing import types_conversion
 
 
 def validate_input_parameters(
@@ -47,11 +46,8 @@ def run_node(
     try:
         library = get_active_library_or_error()
         node = library.nodes[node.name]
-        converted_parameters = types_conversion(
-            passed_input_parameters, node.parameters_class.serialize()
-        )
         result = library.run_node(
-            node.name, node.parameters_class(**converted_parameters)
+            node.name, node.parameters_class(**passed_input_parameters)
         )
     except Exception as ex:
         state.last_run = LastRun(
diff --git a/qualibrate_runner/core/types_parsing.py b/qualibrate_runner/core/types_parsing.py
index 257d777..fe448b6 100644
--- a/qualibrate_runner/core/types_parsing.py
+++ b/qualibrate_runner/core/types_parsing.py
@@ -63,6 +63,15 @@ def parse_float(value: VALUE_TYPES_WITHOUT_REC) -> VALUE_TYPES_WITHOUT_REC:
 
 
 def parse_str(value: VALUE_TYPES_WITHOUT_REC) -> VALUE_TYPES_WITHOUT_REC:
+    if (
+        isinstance(value, str)
+        and len(value) > 1
+        and (
+            (value.startswith('"') and value.endswith('"'))
+            or (value.startswith("'") and value.endswith("'"))
+        )
+    ):
+        return value[1:-1]
     return value