diff --git a/app/src/i18n/locales/en.json b/app/src/i18n/locales/en.json
index 7a6557a..66965eb 100644
--- a/app/src/i18n/locales/en.json
+++ b/app/src/i18n/locales/en.json
@@ -55,5 +55,15 @@
     "not_registered": "Don't have an account?",
     "continue_as_guest": "Continue as Guest",
     "password_rules": "At least 8 characters, including uppercase and lowercase letters and numbers"
+  },
+  "authform_error": {
+    "too_many_requests": "Too many requests, please try again in 2 minutes",
+    "unauthorized": "Invalid username or password",
+    "auth_failed": "Something went wrong",
+    "invalid_username": "Invalid username",
+    "invalid_email": "Invalid email",
+    "invalid_password": "Invalid password",
+    "username_taken": "Username is already taken",
+    "email_taken": "Email is already taken"
   }
 }
diff --git a/app/src/i18n/locales/zh-TW.json b/app/src/i18n/locales/zh-TW.json
index a7352ad..701f7f5 100644
--- a/app/src/i18n/locales/zh-TW.json
+++ b/app/src/i18n/locales/zh-TW.json
@@ -55,5 +55,15 @@
     "not_registered": "還沒有帳號嗎？",
     "continue_as_guest": "以訪客身分繼續",
     "password_rules": "至少 8 個字元，包含數字及大小寫字母"
+  },
+  "authform_error": {
+    "too_many_requests": "太多請求，兩分鐘後再試一次",
+    "unauthorized": "無效的帳號名稱或密碼",
+    "auth_failed": "出了點問題",
+    "invalid_username": "無效的帳號名稱",
+    "invalid_email": "無效的電子郵件",
+    "invalid_password": "無效的密碼",
+    "username_taken": "帳號名稱已被使用",
+    "email_taken": "電子郵件已被使用"
   }
 }
diff --git a/app/src/utils/auth.ts b/app/src/utils/auth.ts
index 4b7e058..c79be1c 100644
--- a/app/src/utils/auth.ts
+++ b/app/src/utils/auth.ts
@@ -1,4 +1,5 @@
 import api from './api'
+import { i18n } from '../i18n'
 
 import {
   TooManyRequestsError,
@@ -32,11 +33,15 @@ function handleRequestError(err: {
       const { path, msg } = errors[0]
       switch (path) {
         case 'username':
-          throw new ValidationError('Username is already taken')
+          throw new ValidationError(
+            i18n.global.t('authform_error.username_taken')
+          )
         case 'email':
-          throw new ValidationError('Email is already taken')
+          throw new ValidationError(i18n.global.t('authform_error.email_taken'))
         case 'password':
-          throw new ValidationError('Password is too weak')
+          throw new ValidationError(
+            i18n.global.t('authform_error.invalid_password')
+          )
         default:
           throw new ValidationError(msg)
       }
diff --git a/app/src/views/LoginPage.vue b/app/src/views/LoginPage.vue
index 97f5a3e..0c22fea 100644
--- a/app/src/views/LoginPage.vue
+++ b/app/src/views/LoginPage.vue
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { useI18n } from 'vue-i18n'
 import AuthForm from '../components/AuthForm.vue'
 import DynamicBackground from '../components/DynamicBackground.vue'
 import HeaderPart from '../components/header/HeaderPart.vue'
@@ -10,6 +11,8 @@ import {
 } from '../utils/errors'
 import { login } from '../utils/auth'
 
+const { t } = useI18n()
+
 const handleLogin = async ({
   username,
   password,
@@ -27,19 +30,19 @@ const handleLogin = async ({
     if (isSuccess) success()
   } catch (err) {
     if (err instanceof TooManyRequestsError) {
-      error('太多請求，兩分鐘後再試一次。')
+      error(t('authform_error.too_many_requests'))
       return
     }
     if (err instanceof UnauthorizedError) {
-      error('錯誤的帳號名稱或密碼。')
+      error(t('authform_error.unauthorized'))
       return
     }
     if (err instanceof ValidationError) {
-      error('無效的帳號名稱或密碼。')
+      error(err.message)
       return
     }
     console.error(err)
-    error('出了點問題。')
+    error(t('authform_error.auth_failed'))
   }
 }
 </script>
diff --git a/app/src/views/RegisterPage.vue b/app/src/views/RegisterPage.vue
index 3f72db5..db5ae9f 100644
--- a/app/src/views/RegisterPage.vue
+++ b/app/src/views/RegisterPage.vue
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { useI18n } from 'vue-i18n'
 import validator from 'validator'
 import { isValidUsername } from '../../../packages/utils'
 import { passwordPolicy } from '../../../packages/constants'
@@ -12,6 +13,8 @@ import {
   ValidationError,
 } from '../utils/errors'
 
+const { t } = useI18n()
+
 function handleRegister({
   username,
   email,
@@ -30,11 +33,11 @@ function handleRegister({
     .then(success)
     .catch((err) => {
       if (err instanceof TooManyRequestsError) {
-        error('太多請求，兩分鐘後再試一次。')
+        error(t('authform_error.too_many_requests'))
         return
       }
       if (err instanceof UnauthorizedError) {
-        error('無效的帳號名稱或密碼。')
+        error(t('authform_error.unauthorized'))
         return
       }
       if (err instanceof ValidationError) {
@@ -42,7 +45,7 @@ function handleRegister({
         return
       }
       console.error(err)
-      error('出了點問題。')
+      error(t('authform_error.auth_failed'))
     })
 }
 
@@ -59,15 +62,15 @@ async function check({
   error: (msg: string) => void
 }) {
   if (username && !isValidUsername(username)) {
-    error('無效的帳號名稱')
+    error(t('authform_error.invalid_username'))
     return
   }
   if (email && !validator.isEmail(email)) {
-    error('無效的電子郵件')
+    error(t('authform_error.invalid_email'))
     return
   }
   if (password && !validator.isStrongPassword(password, passwordPolicy)) {
-    error('密碼必須超過8個字元，至少包含一個數字、一個大寫及一個小寫。')
+    error(t('authform_error.invalid_password'))
     return
   }
   try {
@@ -78,11 +81,11 @@ async function check({
       return
     }
     if (err instanceof TooManyRequestsError) {
-      error('太多請求，兩分鐘後再試一次。')
+      error(t('authform_error.too_many_requests'))
       return
     }
     console.error(err)
-    error('出了點問題。')
+    error(t('authform_error.registration_failed'))
   }
 }
 </script>