diff --git a/src/app.tsx b/src/app.tsx
index 37c3e9e..6bbd67e 100644
--- a/src/app.tsx
+++ b/src/app.tsx
@@ -60,6 +60,7 @@ export interface ChatStore {
   tts_speed_enabled: boolean;
   image_gen_api: string;
   image_gen_key: string;
+  json_mode: boolean;
 }
 
 const _defaultAPIEndpoint = "https://api.openai.com/v1/chat/completions";
@@ -79,7 +80,8 @@ export const newChatStore = (
   tts_speed_enabled = false,
   toolsString = "",
   image_gen_api = "https://api.openai.com/v1/images/generations",
-  image_gen_key = ""
+  image_gen_key = "",
+  json_mode = false
 ): ChatStore => {
   return {
     chatgpt_api_web_version: CHATGPT_API_WEB_VERSION,
@@ -114,6 +116,7 @@ export const newChatStore = (
     tts_speed_enabled: tts_speed_enabled,
     image_gen_api: image_gen_api,
     image_gen_key: image_gen_key,
+    json_mode: json_mode,
   };
 };
 
@@ -273,7 +276,8 @@ export function App() {
         chatStore.tts_speed_enabled,
         chatStore.toolsString,
         chatStore.image_gen_api,
-        chatStore.image_gen_key
+        chatStore.image_gen_key,
+        chatStore.json_mode
       )
     );
     setSelectedChatIndex(newKey as number);
diff --git a/src/chatbox.tsx b/src/chatbox.tsx
index 5eb3caa..55328d8 100644
--- a/src/chatbox.tsx
+++ b/src/chatbox.tsx
@@ -222,6 +222,7 @@ export default function ChatBOX(props: {
     client.enable_top_p = chatStore.top_p_enabled;
     client.frequency_penalty = chatStore.frequency_penalty;
     client.presence_penalty = chatStore.presence_penalty;
+    client.json_mode = chatStore.json_mode;
     client.messages = chatStore.history
       // only copy non hidden message
       .filter(({ hide }) => !hide)
diff --git a/src/chatgpt.ts b/src/chatgpt.ts
index 724765c..842f4b9 100644
--- a/src/chatgpt.ts
+++ b/src/chatgpt.ts
@@ -132,6 +132,7 @@ class Chat {
   enable_top_p: boolean;
   presence_penalty: number;
   frequency_penalty: number;
+  json_mode: boolean;
 
   constructor(
     OPENAI_API_KEY: string | undefined,
@@ -150,6 +151,7 @@ class Chat {
       enable_top_p = false,
       presence_penalty = 0,
       frequency_penalty = 0,
+      json_mode = false,
     } = {}
   ) {
     this.OPENAI_API_KEY = OPENAI_API_KEY ?? "";
@@ -169,6 +171,7 @@ class Chat {
     this.enable_top_p = enable_top_p;
     this.presence_penalty = presence_penalty;
     this.frequency_penalty = frequency_penalty;
+    this.json_mode = json_mode;
   }
 
   _fetch(stream = false) {
@@ -217,6 +220,11 @@ class Chat {
     if (this.enable_max_gen_tokens) {
       body["max_tokens"] = this.max_gen_tokens;
     }
+    if (this.json_mode) {
+      body["response_format"] = {
+        type: "json_object",
+      };
+    }
 
     // parse toolsString to function call format
     const ts = this.toolsString.trim();
diff --git a/src/settings.tsx b/src/settings.tsx
index 50cd13a..ca73e00 100644
--- a/src/settings.tsx
+++ b/src/settings.tsx
@@ -246,7 +246,7 @@ const Number = (props: {
 const Choice = (props: {
   chatStore: ChatStore;
   setChatStore: (cs: ChatStore) => void;
-  field: "streamMode" | "develop_mode";
+  field: "streamMode" | "develop_mode" | "json_mode";
   help: string;
 }) => {
   return (
@@ -420,6 +420,7 @@ export default (props: {
             help="开发者模式，拥有更多选项及功能"
             {...props}
           />
+          <Choice field="json_mode" help="JSON Mode" {...props} />
           <SelectModel
             help="模型，默认 3.5。不同模型性能和定价也不同，请参考 API 文档。（GPT-4 模型处于内测阶段，需要向 OPENAI 申请, 请确保您有访问权限）"
             {...props}