diff --git a/src/app.tsx b/src/app.tsx
index cd818d6..17fbc31 100644
--- a/src/app.tsx
+++ b/src/app.tsx
@@ -142,7 +142,7 @@ export function App() {
 
   const getChatStoreByIndex = async (index: number): Promise<ChatStore> => {
     const ret: ChatStore = await (await db).get(STORAGE_NAME, index);
-    if (ret === null || ret === undefined) return newChatStore();
+    if (ret === null || ret === undefined) return newChatStore({});
     // handle read from old version chatstore
     if (ret.maxGenTokens === undefined) ret.maxGenTokens = 2048;
     if (ret.maxGenTokens_enabled === undefined) ret.maxGenTokens_enabled = true;
@@ -162,7 +162,7 @@ export function App() {
     return ret;
   };
 
-  const [chatStore, _setChatStore] = useState(newChatStore());
+  const [chatStore, _setChatStore] = useState(newChatStore({}));
   const setChatStore = async (chatStore: ChatStore) => {
     // building field for search
     chatStore.contents_for_index = BuildFiledForSearch(chatStore);
@@ -212,32 +212,7 @@ export function App() {
   );
 
   const handleNewChatStoreWithOldOne = async (chatStore: ChatStore) => {
-    const newKey = await (
-      await db
-    ).add(
-      STORAGE_NAME,
-      newChatStore(
-        chatStore.apiKey,
-        chatStore.systemMessageContent,
-        chatStore.apiEndpoint,
-        chatStore.streamMode,
-        chatStore.model,
-        chatStore.temperature,
-        !!chatStore.develop_mode,
-        chatStore.whisper_api,
-        chatStore.whisper_key,
-        chatStore.tts_api,
-        chatStore.tts_key,
-        chatStore.tts_speed,
-        chatStore.tts_speed_enabled,
-        chatStore.tts_format,
-        chatStore.toolsString,
-        chatStore.image_gen_api,
-        chatStore.image_gen_key,
-        chatStore.json_mode,
-        false, // logprobs default to false
-      ),
-    );
+    const newKey = await (await db).add(STORAGE_NAME, newChatStore(chatStore));
     setSelectedChatIndex(newKey as number);
     setAllChatStoreIndexes(await (await db).getAllKeys(STORAGE_NAME));
   };
diff --git a/src/types/newChatstore.ts b/src/types/newChatstore.ts
index 658a47d..2528cc0 100644
--- a/src/types/newChatstore.ts
+++ b/src/types/newChatstore.ts
@@ -7,66 +7,82 @@ import getDefaultParams from "@/utils/getDefaultParam";
 import { ChatStore } from "@/types/chatstore";
 import { models } from "@/types/models";
 
-export const newChatStore = (
-  apiKey = "",
-  systemMessageContent = "",
-  apiEndpoint = DefaultAPIEndpoint,
-  streamMode = true,
-  model = DefaultModel,
-  temperature = 0.7,
-  dev = false,
-  whisper_api = "https://api.openai.com/v1/audio/transcriptions",
-  whisper_key = "",
-  tts_api = "https://api.openai.com/v1/audio/speech",
-  tts_key = "",
-  tts_speed = 1.0,
-  tts_speed_enabled = false,
-  tts_format = "mp3",
-  toolsString = "",
-  image_gen_api = "https://api.openai.com/v1/images/generations",
-  image_gen_key = "",
-  json_mode = false,
-  logprobs = false,
-): ChatStore => {
+interface NewChatStoreOptions {
+  apiKey?: string;
+  systemMessageContent?: string;
+  apiEndpoint?: string;
+  streamMode?: boolean;
+  model?: string;
+  temperature?: number;
+  dev?: boolean;
+  whisper_api?: string;
+  whisper_key?: string;
+  tts_api?: string;
+  tts_key?: string;
+  tts_speed?: number;
+  tts_speed_enabled?: boolean;
+  tts_format?: string;
+  toolsString?: string;
+  image_gen_api?: string;
+  image_gen_key?: string;
+  json_mode?: boolean;
+  logprobs?: boolean;
+}
+
+export const newChatStore = (options: NewChatStoreOptions): ChatStore => {
   return {
     chatgpt_api_web_version: CHATGPT_API_WEB_VERSION,
-    systemMessageContent: getDefaultParams("sys", systemMessageContent),
-    toolsString,
+    systemMessageContent: getDefaultParams(
+      "sys",
+      options.systemMessageContent ?? "",
+    ),
+    toolsString: options.toolsString ?? "",
     history: [],
     postBeginIndex: 0,
     tokenMargin: 1024,
     totalTokens: 0,
     maxTokens: getDefaultParams(
       "max",
-      models[getDefaultParams("model", model)]?.maxToken ?? 2048,
+      models[getDefaultParams("model", options.model ?? DefaultModel)]
+        ?.maxToken ?? 2048,
     ),
     maxGenTokens: 2048,
     maxGenTokens_enabled: false,
-    apiKey: getDefaultParams("key", apiKey),
-    apiEndpoint: getDefaultParams("api", apiEndpoint),
-    streamMode: getDefaultParams("mode", streamMode),
-    model: getDefaultParams("model", model),
+    apiKey: getDefaultParams("key", options.apiKey ?? ""),
+    apiEndpoint: getDefaultParams(
+      "api",
+      options.apiEndpoint ?? DefaultAPIEndpoint,
+    ),
+    streamMode: getDefaultParams("mode", options.streamMode ?? true),
+    model: getDefaultParams("model", options.model ?? DefaultModel),
     responseModelName: "",
     cost: 0,
-    temperature: getDefaultParams("temp", temperature),
+    temperature: getDefaultParams("temp", options.temperature ?? 0.7),
     temperature_enabled: true,
     top_p: 1,
     top_p_enabled: false,
     presence_penalty: 0,
     frequency_penalty: 0,
-    develop_mode: getDefaultParams("dev", dev),
-    whisper_api: getDefaultParams("whisper-api", whisper_api),
-    whisper_key: getDefaultParams("whisper-key", whisper_key),
-    tts_api: getDefaultParams("tts-api", tts_api),
-    tts_key: getDefaultParams("tts-key", tts_key),
+    develop_mode: getDefaultParams("dev", options.dev ?? false),
+    whisper_api: getDefaultParams(
+      "whisper-api",
+      options.whisper_api ?? "https://api.openai.com/v1/audio/transcriptions",
+    ),
+    whisper_key: getDefaultParams("whisper-key", options.whisper_key ?? ""),
+    tts_api: getDefaultParams(
+      "tts-api",
+      options.tts_api ?? "https://api.openai.com/v1/audio/speech",
+    ),
+    tts_key: getDefaultParams("tts-key", options.tts_key ?? ""),
     tts_voice: "alloy",
-    tts_speed: tts_speed,
-    tts_speed_enabled: tts_speed_enabled,
-    image_gen_api: image_gen_api,
-    image_gen_key: image_gen_key,
-    json_mode: json_mode,
-    tts_format: tts_format,
-    logprobs,
+    tts_speed: options.tts_speed ?? 1.0,
+    tts_speed_enabled: options.tts_speed_enabled ?? false,
+    image_gen_api:
+      options.image_gen_api ?? "https://api.openai.com/v1/images/generations",
+    image_gen_key: options.image_gen_key ?? "",
+    json_mode: options.json_mode ?? false,
+    tts_format: options.tts_format ?? "mp3",
+    logprobs: options.logprobs ?? false,
     contents_for_index: [],
   };
 };
diff --git a/src/utils/getDefaultParam.ts b/src/utils/getDefaultParam.ts
index 2f5ff89..519a242 100644
--- a/src/utils/getDefaultParam.ts
+++ b/src/utils/getDefaultParam.ts
@@ -1,6 +1,7 @@
 function getDefaultParams(param: string, val: string): string;
 function getDefaultParams(param: string, val: number): number;
 function getDefaultParams(param: string, val: boolean): boolean;
+
 function getDefaultParams(param: any, val: any) {
   const queryParameters = new URLSearchParams(window.location.search);
   const get = queryParameters.get(param);