diff --git a/jambo/parser/string_type_parser.py b/jambo/parser/string_type_parser.py
index f8d0c9e..0cd3aa1 100644
--- a/jambo/parser/string_type_parser.py
+++ b/jambo/parser/string_type_parser.py
@@ -19,7 +19,6 @@ class StringTypeParser(GenericTypeParser):
         "maxLength": "max_length",
         "minLength": "min_length",
         "pattern": "pattern",
-        "format": "format",
     }
 
     format_type_mapping = {
@@ -63,4 +62,8 @@ class StringTypeParser(GenericTypeParser):
         if format_type in self.format_pattern_mapping:
             mapped_properties["pattern"] = self.format_pattern_mapping[format_type]
 
+        if "json_schema_extra" not in mapped_properties:
+            mapped_properties["json_schema_extra"] = {}
+        mapped_properties["json_schema_extra"]["format"] = format_type
+
         return mapped_type, mapped_properties