String Converter Node

string_lower.py

@@ -0,0 +1,17 @@
+class StringLower:
+    CATEGORY = "Text"   # shows up under "Text" in the node picker
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "text": ("STRING",),   # one STRING input
+            }
+        }
+
+    RETURN_TYPES = ("STRING",)  # one STRING output (fixed syntax error)
+    FUNCTION = "to_lower"         # name of the method to call
+
+    def to_lower(self, text):
+        # do the work and return a tuple matching RETURN_TYPES
+        return (text.lower(),)