diff --git a/packages/ui/src/views/chatflows/APICodeDialog.js b/packages/ui/src/views/chatflows/APICodeDialog.js
index 5e32c1d4b..57484c80e 100644
--- a/packages/ui/src/views/chatflows/APICodeDialog.js
+++ b/packages/ui/src/views/chatflows/APICodeDialog.js
@@ -190,7 +190,10 @@ output = query({
         "${baseURL}/api/v1/prediction/${dialogProps.chatflowid}",
         {
             method: "POST",
-            body: data
+            headers: {
+                "Content-Type": "application/json"
+            },
+            body: JSON.stringify(data)
         }
     );
     const result = await response.json();
@@ -229,9 +232,12 @@ output = query({
     const response = await fetch(
         "${baseURL}/api/v1/prediction/${dialogProps.chatflowid}",
         {
-            headers: { Authorization: "Bearer ${selectedApiKey?.apiKey}" },
+            headers: {
+                Authorization: "Bearer ${selectedApiKey?.apiKey}",
+                "Content-Type": "application/json"
+            },
             method: "POST",
-            body: data
+            body: JSON.stringify(data)
         }
     );
     const result = await response.json();
@@ -392,7 +398,10 @@ output = query({
         "${baseURL}/api/v1/prediction/${dialogProps.chatflowid}",
         {
             method: "POST",
-            body: data
+            headers: {
+                "Content-Type": "application/json"
+            },
+            body: JSON.stringify(data)
         }
     );
     const result = await response.json();
@@ -439,9 +448,12 @@ output = query({
     const response = await fetch(
         "${baseURL}/api/v1/prediction/${dialogProps.chatflowid}",
         {
-            headers: { Authorization: "Bearer ${selectedApiKey?.apiKey}" },
+            headers: {
+                Authorization: "Bearer ${selectedApiKey?.apiKey}",
+                "Content-Type": "application/json"
+            },
             method: "POST",
-            body: data
+            body: JSON.stringify(data)
         }
     );
     const result = await response.json();