diff --git a/miniapp/utils/api.js b/miniapp/utils/api.js
index 61c15ff..d2f1a2d 100644
--- a/miniapp/utils/api.js
+++ b/miniapp/utils/api.js
@@ -1,5 +1,5 @@
 const SESSION_KEY = 'tkmind_session';
-const { createUuid } = require('./uuid');
+const { createUuid } = require('./config');
 
 let apiBaseUrl = '';
 let cookie = '';
diff --git a/miniapp/utils/config.js b/miniapp/utils/config.js
index 1014d2f..7200644 100644
--- a/miniapp/utils/config.js
+++ b/miniapp/utils/config.js
@@ -2,6 +2,17 @@
 // Local Portal debug: set LOCAL_DEV = true, or copy config.local.example.js → config.local.js
 const LOCAL_DEV = false;
 
+function createUuid() {
+  const bytes = [];
+  for (let i = 0; i < 16; i += 1) {
+    bytes.push(Math.floor(Math.random() * 256));
+  }
+  bytes[6] = (bytes[6] & 0x0f) | 0x40;
+  bytes[8] = (bytes[8] & 0x3f) | 0x80;
+  const hex = bytes.map((byte) => byte.toString(16).padStart(2, '0')).join('');
+  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`;
+}
+
 const defaults = {
   API_BASE_URL: LOCAL_DEV ? 'http://127.0.0.1:8081' : 'https://m.tkmind.cn',
   MINIAPP_LOGIN_PATH: '/auth/wechat-miniapp/login',
@@ -18,6 +29,7 @@ try {
 }
 
 module.exports = {
+  createUuid,
   ...defaults,
   ...localOverrides,
   ...(localOverrides.API_BASE_URL
diff --git a/miniapp/utils/messages.js b/miniapp/utils/messages.js
index b5b0625..107848e 100644
--- a/miniapp/utils/messages.js
+++ b/miniapp/utils/messages.js
@@ -1,4 +1,4 @@
-const { createUuid } = require('./uuid');
+const { createUuid } = require('./config');
 const { buildMessageView } = require('./message-display');
 
 function createUserMessage(text) {
diff --git a/miniapp/utils/uuid.js b/miniapp/utils/uuid.js
deleted file mode 100644
index 1c0b4b4..0000000
--- a/miniapp/utils/uuid.js
+++ /dev/null
@@ -1,21 +0,0 @@
-function createUuid() {
-  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
-    return crypto.randomUUID();
-  }
-  const bytes = new Uint8Array(16);
-  if (typeof crypto !== 'undefined' && typeof crypto.getRandomValues === 'function') {
-    crypto.getRandomValues(bytes);
-  } else {
-    for (let i = 0; i < 16; i += 1) {
-      bytes[i] = Math.floor(Math.random() * 256);
-    }
-  }
-  bytes[6] = (bytes[6] & 0x0f) | 0x40;
-  bytes[8] = (bytes[8] & 0x3f) | 0x80;
-  const hex = Array.from(bytes, (byte) => byte.toString(16).padStart(2, '0')).join('');
-  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`;
-}
-
-module.exports = {
-  createUuid,
-};