diff --git a/src/lib/userstate.js b/src/lib/userstate.js
index 0e3d4bb9..ae0957e5 100644
--- a/src/lib/userstate.js
+++ b/src/lib/userstate.js
@@ -1,3 +1,5 @@
+import utils from './utils.js'
+
 const tokenLocalStorageKey = 'lab_user_token';
 const userInfoLocalStorageKey = 'lab_user_info';
 
@@ -15,19 +17,19 @@ function isUserLogined() {
 }
 
 function updateToken(token) {
-    if (typeof(token) === 'string') {
+    if (utils.isString(token)) {
         localStorage.setItem(tokenLocalStorageKey, token);
     }
 }
 
 function updateUserInfo(user) {
-    if (typeof(user) === 'object') {
+    if (utils.isObject(user)) {
         localStorage.setItem(userInfoLocalStorageKey, JSON.stringify(user));
     }
 }
 
 function updateTokenAndUserInfo(item) {
-    if (typeof(item) === 'object') {
+    if (utils.isObject(item)) {
         if (item.token) {
             updateToken(item.token);
         }
diff --git a/src/lib/utils.js b/src/lib/utils.js
new file mode 100644
index 00000000..02b58ff4
--- /dev/null
+++ b/src/lib/utils.js
@@ -0,0 +1,36 @@
+function isFunction(val) {
+    return typeof(val) === 'function';
+}
+
+function isObject(val) {
+    return val != null && typeof(val) === 'object';
+}
+
+function isArray(val) {
+    if (isFunction(Array.isArray)) {
+        return Array.isArray(val);
+    }
+
+    return Object.prototype.toString.call(val) === '[object Array]';
+}
+
+function isString(val) {
+    return typeof(val) === 'string';
+}
+
+function isNumber(val) {
+    return typeof(val) === 'number';
+}
+
+function isBoolean(val) {
+    return typeof(val) === 'boolean';
+}
+
+export default {
+    isFunction,
+    isObject,
+    isArray,
+    isString,
+    isNumber,
+    isBoolean,
+};
diff --git a/src/mobile-main.js b/src/mobile-main.js
index 3ada4ffb..d0156ac1 100644
--- a/src/mobile-main.js
+++ b/src/mobile-main.js
@@ -18,6 +18,7 @@ import version from './lib/version.js';
 import settings from './lib/settings.js';
 import services from './lib/services.js';
 import userstate from './lib/userstate.js';
+import utils from './lib/utils.js';
 import App from './Mobile.vue';
 
 Vue.use(VueI18n);
@@ -29,6 +30,7 @@ Framework7.use(Framework7Vue);
 const i18n = new VueI18n(getI18nOptions());
 
 Vue.prototype.$version = version.getVersion;
+Vue.prototype.$utils = utils;
 Vue.prototype.$settings = settings;
 Vue.prototype.$getDefaultLanguage = getDefaultLanguage;
 Vue.prototype.$getAllLanguages = getAllLanguages;
diff --git a/src/views/mobile/Signup.vue b/src/views/mobile/Signup.vue
index 50d26a39..3e0b6246 100644
--- a/src/views/mobile/Signup.vue
+++ b/src/views/mobile/Signup.vue
@@ -144,7 +144,7 @@ export default {
                     return;
                 }
 
-                if (typeof(data.result.token) === 'string') {
+                if (self.$utils.isString(data.result.token)) {
                     self.$user.updateTokenAndUserInfo(data.result);
                 }
 
diff --git a/src/views/mobile/users/TwoFactorAuth.vue b/src/views/mobile/users/TwoFactorAuth.vue
index 9a04a7d7..8e53a5f4 100644
--- a/src/views/mobile/users/TwoFactorAuth.vue
+++ b/src/views/mobile/users/TwoFactorAuth.vue
@@ -161,7 +161,7 @@ export default {
             self.loading = false;
             const data = response.data;
 
-            if (!data || !data.success || !data.result || typeof(data.result.enable) !== 'boolean') {
+            if (!data || !data.success || !data.result || !self.$utils.isBoolean(data.result.enable)) {
                 self.$alert('Unable to get current two factor authentication status', () => {
                     router.back();
                 });
diff --git a/src/views/mobile/users/UserProfile.vue b/src/views/mobile/users/UserProfile.vue
index ae2de689..44bc143e 100644
--- a/src/views/mobile/users/UserProfile.vue
+++ b/src/views/mobile/users/UserProfile.vue
@@ -220,11 +220,11 @@ export default {
                     return;
                 }
 
-                if (typeof(data.result.newToken) === 'string') {
+                if (self.$utils.isString(data.result.newToken)) {
                     self.$user.updateToken(data.result.newToken);
                 }
 
-                if (typeof(data.result.user) === 'object') {
+                if (self.$utils.isObject(data.result.user)) {
                     self.$user.updateUserInfo(data.result.user);
                 }