diff --git a/gluon/dal.py b/gluon/dal.py
index 2c68a8d2..73783a45 100644
--- a/gluon/dal.py
+++ b/gluon/dal.py
@@ -6781,7 +6781,7 @@ def sqlhtml_validators(field):
     if field_type in (('string', 'text', 'password')):
         requires.append(validators.IS_LENGTH(field_length))
     elif field_type == 'json':
-        requires.append(validators.IS_EMPTY_OR(validators.IS_JSON()))
+        requires.append(validators.IS_EMPTY_OR(validators.IS_JSON(native_json=field.db._adapter.native_json)))
     elif field_type == 'double' or field_type == 'float':
         requires.append(validators.IS_FLOAT_IN_RANGE(-1e100, 1e100))
     elif field_type in ('integer','bigint'):
diff --git a/gluon/validators.py b/gluon/validators.py
index 898e197b..b7122633 100644
--- a/gluon/validators.py
+++ b/gluon/validators.py
@@ -346,13 +346,17 @@ class IS_JSON(Validator):
         ('spam1234', 'invalid json')
     """
 
-    def __init__(self, error_message='invalid json'):
+    def __init__(self, error_message='invalid json', native_json=False):
+        self.native_json = native_json
         self.error_message = error_message
 
     def __call__(self, value):
         if value is None:
             return None
         try:
+            if self.native_json:
+                simplejson.dumps(value) # raises error in case of malformed json
+                return (value, None) #  the serialized value is not passed
             return (simplejson.loads(value), None)
         except JSONErrors:
             return (value, translate(self.error_message))