From 117b63f6614c2d9c69dff5efa71daa4f993707cb Mon Sep 17 00:00:00 2001
From: shentongmartin <shentong.martin@bytedance.com>
Date: Tue, 5 Aug 2025 21:12:10 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20trimming=20leading=20and=20trailing=20wh?=
 =?UTF-8?q?itespaces=20before=20unmarshal=20LLM=20o=E2=80=A6=20(#587)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../domain/workflow/internal/nodes/utils.go   |  8 ++---
 .../workflow/internal/nodes/utils_test.go     | 34 +++++++++++++++++++
 2 files changed, 37 insertions(+), 5 deletions(-)
 create mode 100644 backend/domain/workflow/internal/nodes/utils_test.go

diff --git a/backend/domain/workflow/internal/nodes/utils.go b/backend/domain/workflow/internal/nodes/utils.go
index d7f4ce75..09fc860b 100644
--- a/backend/domain/workflow/internal/nodes/utils.go
+++ b/backend/domain/workflow/internal/nodes/utils.go
@@ -87,15 +87,13 @@ func TemplateRender(template string, vals map[string]interface{}) (string, error
 }
 
 func ExtractJSONString(content string) string {
+	content = strings.TrimSpace(content)
+
 	if strings.HasPrefix(content, "```") && strings.HasSuffix(content, "```") {
 		content = content[3 : len(content)-3]
 	}
 
-	if strings.HasPrefix(content, "json") {
-		content = content[4:]
-	}
-
-	return content
+	return strings.TrimPrefix(content, "json")
 }
 
 func ConcatTwoMaps(m1, m2 map[string]any) (map[string]any, error) {
diff --git a/backend/domain/workflow/internal/nodes/utils_test.go b/backend/domain/workflow/internal/nodes/utils_test.go
new file mode 100644
index 00000000..5d1c2144
--- /dev/null
+++ b/backend/domain/workflow/internal/nodes/utils_test.go
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package nodes
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coze-dev/coze-studio/backend/pkg/sonic"
+)
+
+func TestExtractJSONString(t *testing.T) {
+	s := "\n```json{\"k\":1}```\t"
+	s1 := ExtractJSONString(s)
+	var v map[string]any
+	err := sonic.UnmarshalString(s1, &v)
+	assert.NoError(t, err)
+	assert.Equal(t, map[string]any{"k": int64(1)}, v)
+}