diff --git a/dolphinscheduler-ui/src/utils/json.ts b/dolphinscheduler-ui/src/utils/json.ts
index 3ce941ddb5..347486ad6e 100644
--- a/dolphinscheduler-ui/src/utils/json.ts
+++ b/dolphinscheduler-ui/src/utils/json.ts
@@ -19,17 +19,11 @@
  * Verify if it is in json format
  */
 const isJson = (str: string) => {
-  if (typeof str === 'string') {
-    try {
-      const obj = JSON.parse(str)
-      if (typeof obj === 'object' && obj) {
-        return true
-      } else {
-        return false
-      }
-    } catch (e) {
-      return false
-    }
+  try {
+    const obj = JSON.parse(str)
+    return !!(typeof obj === 'object' && obj && !Array.isArray(obj))
+  } catch (e) {
+    return false
   }
 }