diff --git a/lib/rest/axios.js b/lib/rest/axios.js
index 1e27bea..0b81ddb 100644
--- a/lib/rest/axios.js
+++ b/lib/rest/axios.js
@@ -17,11 +17,11 @@ export function Axios(config) {
     const max_time = options.retryTime;
     let counter = 0;
     axios.interceptors.response.use(null, (error) => {
-      const config = error.config
+      const config = error.config;
       if (counter < max_time && error.response.status >= 500) {
-        counter++
+        counter++;
         return new Promise((resolve) => {
-          resolve(axios(config))
+          resolve(axios(config));
         })
       }
       return Promise.reject(error)
@@ -30,17 +30,17 @@ export function Axios(config) {
 
   return (method, action, params) => {
     if (typeof (params) != 'undefined' && typeof (params.file) != 'undefined') {
-      var files = []
+      let files = [];
       if (Array.isArray(params.file)) {
         for (let index = 0; index < params.file.length; index++) {
-          files[index] = require('fs').createReadStream(params.file[index])
+          files[index] = require('fs').createReadStream(params.file[index]);
         }
       } else {
         files[0] = require('fs').createReadStream(params.file);
       }
       params.file = files;
     }
-    var options = {
+    let options = {
       url: config.url + '/' + action,
       method: method,
       data: params || '',
@@ -85,7 +85,7 @@ export function Axios(config) {
 
     return new Promise((resolve, reject) => {
       if (isVoiceReq) {
-        retryWrapper(axios, {retryTime: 2})
+        retryWrapper(axios, {retryTime: 2});
         let retryAttempt;
         for (retryAttempt = 0; retryAttempt < 3; retryAttempt++) {
           options.url = apiVoiceUris[retryAttempt] + config.authId + '/' + action;