diff --git a/src/App.jsx b/src/App.jsx
index fd6630e9..34f85eeb 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -38,6 +38,7 @@ const nodeTypes = {
   process_horizontal: ProcessNodeHorizontal,
   delay: DelayNode,
   constant: SourceNode,
+  source: SourceNode,
   stepsource: StepSourceNode,
   pulsesource: SourceNode,
   amplifier: AmplifierNode,
diff --git a/src/backend.py b/src/backend.py
index 25f1e2c1..ab8291c7 100644
--- a/src/backend.py
+++ b/src/backend.py
@@ -80,6 +80,16 @@ def get_default_values(node_type):
                     default_values[param] = None  # Handle empty defaults
                 else:
                     default_values[param] = default_value
+                    # check if default value is serializable to JSON
+                    if not isinstance(
+                        default_value, (int, float, str, bool, list, dict)
+                    ):
+                        # Attempt to convert to JSON serializable type
+                        try:
+                            default_values[param] = json.dumps(default_value)
+                        except TypeError:
+                            # If conversion fails, set to a string 'default'
+                            default_values[param] = "default"
         return jsonify(default_values)
     except Exception as e:
         return jsonify(
diff --git a/src/pathsim_utils.py b/src/pathsim_utils.py
index d20371cd..bc8b2d08 100644
--- a/src/pathsim_utils.py
+++ b/src/pathsim_utils.py
@@ -7,6 +7,7 @@
     Scope,
     Block,
     Constant,
+    Source,
     StepSource,
     PulseSource,
     Amplifier,
@@ -40,6 +41,7 @@
 }
 map_str_to_object = {
     "constant": Constant,
+    "source": Source,
     "stepsource": StepSource,
     "pulsesource": PulseSource,
     "amplifier": Amplifier,