diff --git a/wwwroot/api/instance/voucher_instance_create.dspy b/wwwroot/api/instance/voucher_instance_create.dspy
index 7e91ebd..ff49fe8 100644
--- a/wwwroot/api/instance/voucher_instance_create.dspy
+++ b/wwwroot/api/instance/voucher_instance_create.dspy
@@ -1,4 +1,3 @@
-import json
 
 data = {}
 for key in ['template_id', 'customer_id', 'code', 'source', 'remark', 'valid_from', 'valid_to']:
@@ -7,4 +6,4 @@ for key in ['template_id', 'customer_id', 'code', 'source', 'remark', 'valid_fro
         data[key] = val
 
 result = await create_voucher_instance(data)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/instance/voucher_instance_delete.dspy b/wwwroot/api/instance/voucher_instance_delete.dspy
index b127f9b..20fb070 100644
--- a/wwwroot/api/instance/voucher_instance_delete.dspy
+++ b/wwwroot/api/instance/voucher_instance_delete.dspy
@@ -1,5 +1,4 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 result = await delete_voucher_instance(conditions)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/instance/voucher_instance_update.dspy b/wwwroot/api/instance/voucher_instance_update.dspy
index e59c21c..18bcaaf 100644
--- a/wwwroot/api/instance/voucher_instance_update.dspy
+++ b/wwwroot/api/instance/voucher_instance_update.dspy
@@ -1,4 +1,3 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 data = {}
@@ -8,4 +7,4 @@ for key in ['template_id', 'customer_id', 'code', 'status', 'source', 'remark']:
         data[key] = val
 
 result = await update_voucher_instance(conditions, data)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/rule/voucher_rule_create.dspy b/wwwroot/api/rule/voucher_rule_create.dspy
index 58ded38..f17dd29 100644
--- a/wwwroot/api/rule/voucher_rule_create.dspy
+++ b/wwwroot/api/rule/voucher_rule_create.dspy
@@ -1,4 +1,3 @@
-import json
 
 data = {}
 for key in ['template_id', 'rule_type', 'rule_config', 'enabled', 'sort_order', 'remark']:
@@ -7,4 +6,4 @@ for key in ['template_id', 'rule_type', 'rule_config', 'enabled', 'sort_order',
         data[key] = val
 
 result = await create_voucher_rule(data)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/rule/voucher_rule_delete.dspy b/wwwroot/api/rule/voucher_rule_delete.dspy
index 3a8d848..8175ef4 100644
--- a/wwwroot/api/rule/voucher_rule_delete.dspy
+++ b/wwwroot/api/rule/voucher_rule_delete.dspy
@@ -1,5 +1,4 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 result = await delete_voucher_rule(conditions)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/rule/voucher_rule_update.dspy b/wwwroot/api/rule/voucher_rule_update.dspy
index f2473fa..fa43473 100644
--- a/wwwroot/api/rule/voucher_rule_update.dspy
+++ b/wwwroot/api/rule/voucher_rule_update.dspy
@@ -1,4 +1,3 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 data = {}
@@ -8,4 +7,4 @@ for key in ['template_id', 'rule_type', 'rule_config', 'enabled', 'sort_order',
         data[key] = val
 
 result = await update_voucher_rule(conditions, data)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/template/voucher_template_create.dspy b/wwwroot/api/template/voucher_template_create.dspy
index 8101fbe..64665eb 100644
--- a/wwwroot/api/template/voucher_template_create.dspy
+++ b/wwwroot/api/template/voucher_template_create.dspy
@@ -1,4 +1,3 @@
-import json
 
 params = params_kw if hasattr(params_kw, '__getitem__') else {}
 data = {}
@@ -8,4 +7,4 @@ for key in ['name', 'code', 'face_value', 'total_count', 'valid_days', 'status',
         data[key] = val
 
 result = await create_voucher_template(data)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/template/voucher_template_delete.dspy b/wwwroot/api/template/voucher_template_delete.dspy
index 74168fa..5501416 100644
--- a/wwwroot/api/template/voucher_template_delete.dspy
+++ b/wwwroot/api/template/voucher_template_delete.dspy
@@ -1,5 +1,4 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 result = await delete_voucher_template(conditions)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/template/voucher_template_update.dspy b/wwwroot/api/template/voucher_template_update.dspy
index 96c70e7..2faf9b9 100644
--- a/wwwroot/api/template/voucher_template_update.dspy
+++ b/wwwroot/api/template/voucher_template_update.dspy
@@ -1,4 +1,3 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 data = {}
@@ -8,4 +7,4 @@ for key in ['name', 'code', 'face_value', 'total_count', 'valid_days', 'status',
         data[key] = val
 
 result = await update_voucher_template(conditions, data)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/usage/voucher_usage_log_create.dspy b/wwwroot/api/usage/voucher_usage_log_create.dspy
index 267f92f..a8549c6 100644
--- a/wwwroot/api/usage/voucher_usage_log_create.dspy
+++ b/wwwroot/api/usage/voucher_usage_log_create.dspy
@@ -1,4 +1,3 @@
-import json
 
 data = {}
 for key in ['instance_id', 'customer_id', 'order_id', 'face_value', 'deducted_amount', 'used_at', 'used_by', 'product_type', 'product_name']:
@@ -7,4 +6,4 @@ for key in ['instance_id', 'customer_id', 'order_id', 'face_value', 'deducted_am
         data[key] = val
 
 result = await create_voucher_usage_log(data)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/usage/voucher_usage_log_delete.dspy b/wwwroot/api/usage/voucher_usage_log_delete.dspy
index 25cd76d..8d84db9 100644
--- a/wwwroot/api/usage/voucher_usage_log_delete.dspy
+++ b/wwwroot/api/usage/voucher_usage_log_delete.dspy
@@ -1,5 +1,4 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 result = await delete_voucher_usage_log(conditions)
-return json.dumps(result)
+return result
diff --git a/wwwroot/api/usage/voucher_usage_log_update.dspy b/wwwroot/api/usage/voucher_usage_log_update.dspy
index fe689ec..8e6cfa6 100644
--- a/wwwroot/api/usage/voucher_usage_log_update.dspy
+++ b/wwwroot/api/usage/voucher_usage_log_update.dspy
@@ -1,4 +1,3 @@
-import json
 
 conditions = {'id': params_kw.get('id', '')}
 data = {}
@@ -8,4 +7,4 @@ for key in ['instance_id', 'customer_id', 'order_id', 'face_value', 'deducted_am
         data[key] = val
 
 result = await update_voucher_usage_log(conditions, data)
-return json.dumps(result)
+return result