diff --git a/.webpack/js.js b/.webpack/js.js
index f828becd..18d14262 100644
--- a/.webpack/js.js
+++ b/.webpack/js.js
@@ -74,26 +74,26 @@ module.exports = {
     },
     entry: {
         cloudcmd: `${dir}/cloudcmd.js`,
-        [modules + '/edit']: `${dirModules}/edit.js`,
-        [modules + '/edit-file']: `${dirModules}/edit-file.js`,
-        [modules + '/edit-file-vim']: `${dirModules}/edit-file-vim.js`,
-        [modules + '/edit-names']: `${dirModules}/edit-names.js`,
-        [modules + '/edit-names-vim']: `${dirModules}/edit-names-vim.js`,
-        [modules + '/menu']: `${dirModules}/menu.js`,
-        [modules + '/view']: `${dirModules}/view/index.js`,
-        [modules + '/help']: `${dirModules}/help.js`,
-        [modules + '/markdown']: `${dirModules}/markdown.js`,
-        [modules + '/config']: `${dirModules}/config/index.js`,
-        [modules + '/contact']: `${dirModules}/contact.js`,
-        [modules + '/upload']: `${dirModules}/upload.js`,
-        [modules + '/operation']: `${dirModules}/operation/index.js`,
-        [modules + '/konsole']: `${dirModules}/konsole.js`,
-        [modules + '/terminal']: `${dirModules}/terminal.js`,
-        [modules + '/terminal-run']: `${dirModules}/terminal-run.js`,
-        [modules + '/cloud']: `${dirModules}/cloud.js`,
-        [modules + '/user-menu']: `${dirModules}/user-menu/index.js`,
-        [modules + '/polyfill']: `${dirModules}/polyfill.js`,
-        [modules + '/command-line']: `${dirModules}/command-line.js`,
+        [`${modules}/edit`]: `${dirModules}/edit.js`,
+        [`${modules}/edit-file`]: `${dirModules}/edit-file.js`,
+        [`${modules}/edit-file-vim`]: `${dirModules}/edit-file-vim.js`,
+        [`${modules}/edit-names`]: `${dirModules}/edit-names.js`,
+        [`${modules}/edit-names-vim`]: `${dirModules}/edit-names-vim.js`,
+        [`${modules}/menu`]: `${dirModules}/menu.js`,
+        [`${modules}/view`]: `${dirModules}/view/index.js`,
+        [`${modules}/help`]: `${dirModules}/help.js`,
+        [`${modules}/markdown`]: `${dirModules}/markdown.js`,
+        [`${modules}/config`]: `${dirModules}/config/index.js`,
+        [`${modules}/contact`]: `${dirModules}/contact.js`,
+        [`${modules}/upload`]: `${dirModules}/upload.js`,
+        [`${modules}/operation`]: `${dirModules}/operation/index.js`,
+        [`${modules}/konsole`]: `${dirModules}/konsole.js`,
+        [`${modules}/terminal`]: `${dirModules}/terminal.js`,
+        [`${modules}/terminal-run`]: `${dirModules}/terminal-run.js`,
+        [`${modules}/cloud`]: `${dirModules}/cloud.js`,
+        [`${modules}/user-menu`]: `${dirModules}/user-menu/index.js`,
+        [`${modules}/polyfill`]: `${dirModules}/polyfill.js`,
+        [`${modules}/command-line`]: `${dirModules}/command-line.js`,
     },
     output: {
         filename: '[name].js',
diff --git a/bin/cloudcmd.mjs b/bin/cloudcmd.mjs
index 301e01dc..387f2fa1 100755
--- a/bin/cloudcmd.mjs
+++ b/bin/cloudcmd.mjs
@@ -250,7 +250,7 @@ async function main() {
 }
 
 async function validateRoot(root, config) {
-    const validate = await simport(DIR_SERVER + 'validate.js');
+    const validate = await simport(`${DIR_SERVER}validate.js`);
     validate.root(root, config);
     
     if (root === '/')
@@ -269,7 +269,7 @@ function version() {
 }
 
 async function start(options, config) {
-    const SERVER = DIR_SERVER + 'server.mjs';
+    const SERVER = `${DIR_SERVER}server.mjs`;
     
     if (!args.server)
         return;
@@ -326,7 +326,7 @@ async function help() {
 
 function repl() {
     console.log('REPL mode enabled (telnet localhost 1337)');
-    require(DIR_SERVER + 'repl');
+    require(`${DIR_SERVER}repl`);
 }
 
 async function checkUpdate() {
@@ -342,7 +342,7 @@ async function showUpdateInfo(version) {
     
     const chalk = await simport('chalk');
     
-    const latestVersion = chalk.green.bold('v' + version);
+    const latestVersion = chalk.green.bold(`v${version}`);
     const latest = `update available: ${latestVersion}`;
     const current = chalk.dim(`(current: v${Info.version})`);
     
diff --git a/bin/release.mjs b/bin/release.mjs
index d484991c..bceb2c9f 100755
--- a/bin/release.mjs
+++ b/bin/release.mjs
@@ -47,7 +47,7 @@ async function replaceVersion(name, version, versionNew) {
     if (error)
         return console.error(error);
     
-    console.log('done: ' + name);
+    console.log(`done: ${name}`);
 }
 
 async function cl() {
diff --git a/client/client.js b/client/client.js
index a0ca9bf8..6f909207 100644
--- a/client/client.js
+++ b/client/client.js
@@ -141,7 +141,7 @@ function CloudCmdProto(DOM) {
 
     async function loadStyle() {
         const {prefix} = CloudCmd;
-        const name = prefix + '/dist/cloudcmd.common.css';
+        const name = `${prefix}/dist/cloudcmd.common.css`;
 
         await load.css(name);
     }
@@ -303,7 +303,7 @@ function CloudCmdProto(DOM) {
     async function ajaxLoad(path, options = {}, panel) {
         const {RESTful} = DOM;
 
-        CloudCmd.log('reading dir: "' + path + '";');
+        CloudCmd.log(`reading dir: "${path}";`);
 
         const dirStorage = CloudCmd.config('dirStorage');
         const json = dirStorage && await Storage.getJson(path);
diff --git a/client/dom/current-file.js b/client/dom/current-file.js
index da52d748..917de0a0 100644
--- a/client/dom/current-file.js
+++ b/client/dom/current-file.js
@@ -115,7 +115,7 @@ module.exports.getCurrentDirName = () => {
         .replace(/\/$/, '');
     
     const substr = href.substr(href, href.lastIndexOf('/'));
-    const ret = href.replace(substr + '/', '') || '/';
+    const ret = href.replace(`${substr}/`, '') || '/';
     
     return ret;
 };
diff --git a/client/dom/directory.js b/client/dom/directory.js
index e9e3d722..8579b930 100644
--- a/client/dom/directory.js
+++ b/client/dom/directory.js
@@ -72,6 +72,6 @@ function uploadFile(url, data) {
 }
 
 function uploadDir(url) {
-    return DOM.load.put(url + '?dir');
+    return DOM.load.put(`${url}?dir`);
 }
 
diff --git a/client/dom/dom-tree.js b/client/dom/dom-tree.js
index 2927f97e..ffd6f5e2 100644
--- a/client/dom/dom-tree.js
+++ b/client/dom/dom-tree.js
@@ -41,7 +41,7 @@ module.exports.getByTag = (tag, element = document) => {
  * @param Id - id
  */
 module.exports.getById = (id, element = document) => {
-    return element.querySelector('#' + id);
+    return element.querySelector(`#${id}`);
 };
 
 /**
diff --git a/client/dom/events/index.js b/client/dom/events/index.js
index 85c24a3d..307768c3 100644
--- a/client/dom/events/index.js
+++ b/client/dom/events/index.js
@@ -33,7 +33,7 @@ function EventsProto() {
         switch(type) {
         default:
             if (!type.endsWith('element'))
-                throw Error('unknown eventName: ' + type);
+                throw Error(`unknown eventName: ${type}`);
             
             parseArgs(
                 args[EVENT_NAME],
diff --git a/client/dom/files.js b/client/dom/files.js
index 6d9627d4..9fac8ee1 100644
--- a/client/dom/files.js
+++ b/client/dom/files.js
@@ -13,7 +13,7 @@ const FILES_JSON = 'config|modules';
 const FILES_HTML = 'file|path|link|pathLink|media';
 const FILES_HTML_ROOT = 'view/media-tmpl|config-tmpl|upload';
 const DIR_HTML = '/tmpl/';
-const DIR_HTML_FS = DIR_HTML + 'fs/';
+const DIR_HTML_FS = `${DIR_HTML}fs/`;
 const DIR_JSON = '/json/';
 const timeout = getTimeoutOnce(2000);
 
@@ -72,7 +72,7 @@ function getPath(name, isHTML, isJSON) {
 }
 
 function showError(name) {
-    const str = 'Wrong file name: ' + name;
+    const str = `Wrong file name: ${name}`;
     const error = Error(str);
     
     throw error;
diff --git a/client/dom/images.js b/client/dom/images.js
index ac3592f2..8c597ea3 100644
--- a/client/dom/images.js
+++ b/client/dom/images.js
@@ -127,7 +127,7 @@ module.exports.setProgress = (value, title) => {
     if (!element)
         return Images;
     
-    element.setAttribute(DATA, value + '%');
+    element.setAttribute(DATA, `${value}%`);
     
     if (title)
         element.title = title;
diff --git a/client/dom/index.js b/client/dom/index.js
index 42424d16..54a2839e 100644
--- a/client/dom/index.js
+++ b/client/dom/index.js
@@ -79,7 +79,7 @@ module.exports.promptNewFile = async () => {
 async function promptNew(typeName) {
     const {Dialog} = DOM;
     const dir = DOM.getCurrentDirPath();
-    const msg = 'New ' + typeName || 'File';
+    const msg = `New ${typeName}` || 'File';
     const getName = () => {
         const name = DOM.getCurrentName();
         
@@ -115,7 +115,7 @@ module.exports.getCurrentDirName = () => {
         .replace(/\/$/, '');
     
     const substr  = href.substr(href, href.lastIndexOf('/'));
-    const ret     = href.replace(substr + '/', '') || '/';
+    const ret     = href.replace(`${substr}/`, '') || '/';
     
     return ret;
 };
@@ -457,7 +457,7 @@ module.exports.getFilenames = (files) => {
  * check storage hash
  */
 module.exports.checkStorageHash = async (name) => {
-    const nameHash = name + '-hash';
+    const nameHash = `${name}-hash`;
     
     if (typeof name !== 'string')
         throw Error('name should be a string!');
@@ -486,8 +486,8 @@ module.exports.saveDataToStorage = async (name, data, hash) => {
     
     hash = hash || await DOM.loadCurrentHash();
     
-    const nameHash = name + '-hash';
-    const nameData = name + '-data';
+    const nameHash = `${name}-hash`;
+    const nameData = `${name}-data`;
     
     await Storage.set(nameHash, hash);
     await Storage.set(nameData, data);
diff --git a/client/dom/io/index.js b/client/dom/io/index.js
index 1219631a..79944724 100644
--- a/client/dom/io/index.js
+++ b/client/dom/io/index.js
@@ -133,7 +133,7 @@ module.exports.Markdown = {
     read: async (url) => {
         return await sendRequest({
             method: 'GET',
-            url: '/markdown' + url,
+            url: `/markdown${url}`,
             imgPosition,
             notLog: true,
         });
diff --git a/client/key/set-current-by-char.js b/client/key/set-current-by-char.js
index 5ab4599a..c74876a4 100644
--- a/client/key/set-current-by-char.js
+++ b/client/key/set-current-by-char.js
@@ -12,7 +12,7 @@ module.exports = function setCurrentByChar(char, charStore) {
     let i = 0;
     
     const escapeChar = escapeRegExp(char);
-    const regExp = new RegExp('^' + escapeChar + '.*$', 'i');
+    const regExp = new RegExp(`^${escapeChar}.*$`, 'i');
     const {files} = Info;
     const chars = charStore();
     const n = chars.length;
diff --git a/client/key/vim/find.spec.js b/client/key/vim/find.spec.js
index 6dbe073d..3e3d6d3e 100644
--- a/client/key/vim/find.spec.js
+++ b/client/key/vim/find.spec.js
@@ -10,7 +10,7 @@ global.DOM = getDOM();
 const {
     _next,
     _previous,
-} = require(dir + 'find');
+} = require(`${dir}find`);
 
 test('cloudcmd: client: vim: _next', (t) => {
     const result = _next(1, 2);
diff --git a/client/key/vim/index.spec.js b/client/key/vim/index.spec.js
index 3d26e6c8..a28badcc 100644
--- a/client/key/vim/index.spec.js
+++ b/client/key/vim/index.spec.js
@@ -462,7 +462,7 @@ test('cloudcmd: client: key: N', (t) => {
         findPrevious,
     });
 
-    const vim = reRequire(dir + 'vim');
+    const vim = reRequire(`${dir}vim`);
     const event = {};
 
     vim('N', event);
diff --git a/client/listeners/index.js b/client/listeners/index.js
index d923c3ed..054b3f7e 100644
--- a/client/listeners/index.js
+++ b/client/listeners/index.js
@@ -147,7 +147,7 @@ const getPanel = (side) => {
     if (!itype.string(side))
         return side;
     
-    return DOM.getByDataName('js-' + side);
+    return DOM.getByDataName(`js-${side}`);
 };
 
 module.exports.setOnPanel = (side) => {
diff --git a/client/modules/config/index.js b/client/modules/config/index.js
index 130cd183..bf72c661 100644
--- a/client/modules/config/index.js
+++ b/client/modules/config/index.js
@@ -57,7 +57,7 @@ module.exports.init = async () => {
     [Template] = await Promise.all([
         Files.get('config-tmpl'),
         loadSocket(),
-        loadCSS(prefix + '/dist/config.css'),
+        loadCSS(`${prefix}/dist/config.css`),
         CloudCmd.View(),
     ]);
     
@@ -94,7 +94,7 @@ function initSocket() {
     const socket = io.connect(href + prefixSocket + '/config', {
         reconnectionAttempts: Infinity,
         reconnectionDelay: ONE_MINUTE,
-        path: prefix + '/socket.io',
+        path: `${prefix}/socket.io`,
     });
     
     const save = (data) => {
@@ -148,9 +148,9 @@ async function fillTemplate() {
         ...obj
     } = input.convert(config);
     
-    obj[editor + '-selected'] = 'selected';
-    obj[packer + '-selected'] = 'selected';
-    obj[columns + '-selected'] = 'selected';
+    obj[`${editor}-selected`] = 'selected';
+    obj[`${packer}-selected`] = 'selected';
+    obj[`${columns}-selected`] = 'selected';
     obj.configAuth = configAuth ? '' : 'hidden';
     
     const innerHTML = rendy(Template, obj);
diff --git a/client/modules/edit-file.js b/client/modules/edit-file.js
index e34e7345..32616edb 100644
--- a/client/modules/edit-file.js
+++ b/client/modules/edit-file.js
@@ -177,7 +177,7 @@ function getMenuData() {
 }
 
 function setMsgChanged(name) {
-    MSG_CHANGED = 'Do you want to save changes to ' + name + '?';
+    MSG_CHANGED = `Do you want to save changes to ${name}?`;
 }
 
 module.exports.isChanged = isChanged;
diff --git a/client/modules/edit.js b/client/modules/edit.js
index 289a7bd8..1cdcb205 100644
--- a/client/modules/edit.js
+++ b/client/modules/edit.js
@@ -52,7 +52,7 @@ function create() {
 
 function checkFn(name, fn) {
     if (typeof fn !== 'function')
-        throw Error(name + ' should be a function!');
+        throw Error(`${name} should be a function!`);
 }
 
 function initConfig(options = {}) {
@@ -104,7 +104,7 @@ const loadFiles = async (element) => {
     const prefixSocket = `${CloudCmd.prefixSocket}/${EditorName}`;
     const url = `${prefix}/${EditorName}.js`;
 
-    time(Name + ' load');
+    time(`${Name} load`);
 
     await loadJS(url);
 
@@ -116,7 +116,7 @@ const loadFiles = async (element) => {
         socketPath,
     });
 
-    timeEnd(Name + ' load');
+    timeEnd(`${Name} load`);
     editor = ed;
     Loading = false;
 };
diff --git a/client/modules/konsole.js b/client/modules/konsole.js
index e52e5910..5c2ade00 100644
--- a/client/modules/konsole.js
+++ b/client/modules/konsole.js
@@ -133,14 +133,14 @@ module.exports.show = (callback) => {
 };
 
 const load = async () => {
-    Util.time(Name + ' load');
+    Util.time(`${Name} load`);
     
     const prefix = getPrefix();
-    const url = prefix + '/console.js';
+    const url = `${prefix}/console.js`;
     const [error] = await tryToCatch(loadJS, url);
     
     Loaded = true;
-    Util.timeEnd(Name + ' load');
+    Util.timeEnd(`${Name} load`);
     
     if (error)
         return Dialog.alert(error.message, {
diff --git a/client/modules/menu.js b/client/modules/menu.js
index 4ecc17cb..fa85dabc 100644
--- a/client/modules/menu.js
+++ b/client/modules/menu.js
@@ -239,7 +239,7 @@ async function _uploadTo(nameModule) {
     const {name} = Info;
     
     CloudCmd.execFromModule(nameModule, 'uploadFile', name, data);
-    CloudCmd.log('Uploading to ' + name + '...');
+    CloudCmd.log(`Uploading to ${name}...`);
 }
 
 function uploadFromCloud() {
@@ -275,7 +275,7 @@ function download(type) {
         const isDir = DOM.isCurrentIsDir(file);
         const path = DOM.getCurrentPath(file);
         
-        CloudCmd.log('downloading file ' + path + '...');
+        CloudCmd.log(`downloading file ${path}...`);
         /*
           * if we send ajax request -
           * no need in hash so we escape #
diff --git a/client/modules/operation/index.js b/client/modules/operation/index.js
index 4d7dd527..99436763 100644
--- a/client/modules/operation/index.js
+++ b/client/modules/operation/index.js
@@ -421,7 +421,7 @@ async function _processFiles(options, data) {
 
 function checkEmpty(name, operation) {
     if (!operation)
-        throw Error(name + ' could not be empty!');
+        throw Error(`${name} could not be empty!`);
 }
 
 function twopack(operation, type) {
@@ -487,9 +487,9 @@ async function prompt(msg, to, names) {
     msg += ' ';
     
     if (names.length > 1)
-        msg     += n + ' file(s)';
+        msg     += `${n} file(s)`;
     else
-        msg     += '"' + name + '"';
+        msg     += `"${name}"`;
     
     msg += ' to';
     
diff --git a/client/modules/operation/set-listeners.js b/client/modules/operation/set-listeners.js
index 486a7145..8d436ef5 100644
--- a/client/modules/operation/set-listeners.js
+++ b/client/modules/operation/set-listeners.js
@@ -72,7 +72,8 @@ module.exports = (options) => (emitter) => {
                 return;
             }
             
-            const [cancel] = await Dialog.confirm(error + '\n Continue?');
+            const [cancel] = await Dialog.confirm(`${error}
+ Continue?`);
             
             if (!done && !cancel)
                 return emitter.continue();
diff --git a/client/modules/view/index.js b/client/modules/view/index.js
index 260d11f0..a53681fe 100644
--- a/client/modules/view/index.js
+++ b/client/modules/view/index.js
@@ -320,7 +320,7 @@ function check(src) {
 async function loadAll() {
     const {DIR_DIST} = CloudCmd;
 
-    time(Name + ' load');
+    time(`${Name} load`);
 
     Loading = true;
     await loadCSS(`${DIR_DIST}/view.css`);
diff --git a/common/cloudfunc.js b/common/cloudfunc.js
index ab56d8a3..4b686014 100644
--- a/common/cloudfunc.js
+++ b/common/cloudfunc.js
@@ -29,9 +29,9 @@ module.exports.formatMsg = (msg, name, status) => {
     name = name || '';
     
     if (name)
-        name = '("' + name + '")';
+        name = `("${name}")`;
     
-    return msg + ': ' + status + name;
+    return `${msg}: ${status}${name}`;
 };
 
 /**
@@ -82,10 +82,10 @@ function getPathLink(url, prefix, template) {
         const isLast = i === n - 1;
         
         if (i)
-            path += name + '/';
+            path += `${name}/`;
         
         if (i && isLast) {
-            lines.push(name + '/');
+            lines.push(`${name}/`);
             continue;
         }
         
@@ -164,7 +164,7 @@ module.exports.buildFromJSON = (params) => {
     /* сохраняем путь */
     Path(path);
     
-    fileTable += header + '<ul data-name="js-files" class="files">';
+    fileTable += `${header}<ul data-name="js-files" class="files">`;
     
     /* Если мы не в корне */
     if (path !== '/') {
@@ -178,7 +178,7 @@ module.exports.buildFromJSON = (params) => {
         });
         
         const dataName = getDataName('..');
-        const attribute = 'draggable="true" ' + dataName;
+        const attribute = `draggable="true" ${dataName}`;
         
         /* Сохраняем путь к каталогу верхнего уровня*/
         fileTable += rendy(template.file, {
diff --git a/server/cloudcmd.js b/server/cloudcmd.js
index 375ffeea..d5bab863 100644
--- a/server/cloudcmd.js
+++ b/server/cloudcmd.js
@@ -1,26 +1,26 @@
 'use strict';
 
-const DIR = __dirname + '/';
-const DIR_COMMON = DIR + '../common/';
+const DIR = `${__dirname}/`;
+const DIR_COMMON = `${DIR}../common/`;
 const path = require('path');
 
 const fs = require('fs');
-const cloudfunc = require(DIR_COMMON + 'cloudfunc');
+const cloudfunc = require(`${DIR_COMMON}cloudfunc`);
 
-const authentication = require(DIR + 'auth');
+const authentication = require(`${DIR}auth`);
 const {
     createConfig,
     configPath,
-} = require(DIR + 'config');
-const modulas = require(DIR + 'modulas');
+} = require(`${DIR}config`);
+const modulas = require(`${DIR}modulas`);
 
-const userMenu = require(DIR + 'user-menu');
-const rest = require(DIR + 'rest');
-const route = require(DIR + 'route');
-const validate = require(DIR + 'validate');
-const prefixer = require(DIR + 'prefixer');
-const terminal = require(DIR + 'terminal');
-const distribute = require(DIR + 'distribute');
+const userMenu = require(`${DIR}user-menu`);
+const rest = require(`${DIR}rest`);
+const route = require(`${DIR}route`);
+const validate = require(`${DIR}validate`);
+const prefixer = require(`${DIR}prefixer`);
+const terminal = require(`${DIR}terminal`);
+const distribute = require(`${DIR}distribute`);
 const currify = require('currify');
 
 const apart = require('apart');
@@ -33,7 +33,7 @@ const dword = require('dword');
 const deepword = require('deepword');
 const nomine = require('nomine');
 const fileop = require('@cloudcmd/fileop');
-const DIR_ROOT = DIR + '../';
+const DIR_ROOT = `${DIR}../`;
 
 const isDev = process.env.NODE_ENV === 'development';
 const getDist = (isDev) => isDev ? 'dist-dev' : 'dist';
@@ -139,35 +139,35 @@ function listen({prefixSocket, socket, config}) {
     edward.listen(socket, {
         root,
         auth,
-        prefixSocket: prefixSocket + '/edward',
+        prefixSocket: `${prefixSocket}/edward`,
     });
     
     dword.listen(socket, {
         root,
         auth,
-        prefixSocket: prefixSocket + '/dword',
+        prefixSocket: `${prefixSocket}/dword`,
     });
     
     deepword.listen(socket, {
         root,
         auth,
-        prefixSocket: prefixSocket + '/deepword',
+        prefixSocket: `${prefixSocket}/deepword`,
     });
     
     config('console') && konsole.listen(socket, {
         auth,
-        prefixSocket: prefixSocket + '/console',
+        prefixSocket: `${prefixSocket}/console`,
     });
     
     fileop.listen(socket, {
         root,
         auth,
-        prefix: prefixSocket + '/fileop',
+        prefix: `${prefixSocket}/fileop`,
     });
     
     config('terminal') && terminal(config).listen(socket, {
         auth,
-        prefix: prefixSocket + '/gritty',
+        prefix: `${prefixSocket}/gritty`,
         command: config('terminalCommand'),
         autoRestart: config('terminalAutoRestart'),
     });
diff --git a/server/cloudcmd.spec.js b/server/cloudcmd.spec.js
index d0e47e2e..89157dd1 100644
--- a/server/cloudcmd.spec.js
+++ b/server/cloudcmd.spec.js
@@ -9,7 +9,7 @@ const {
 const {reRequire} = require('mock-require');
 
 const DIR = './';
-const cloudcmdPath = DIR + 'cloudcmd';
+const cloudcmdPath = `${DIR}cloudcmd`;
 
 const cloudcmd = require(cloudcmdPath);
 const {request} = require('serve-once')(cloudcmd, {
@@ -94,7 +94,7 @@ test('cloudcmd: replaceDist', (t) => {
 
 test('cloudcmd: replaceDist: !isDev', (t) => {
     const url = '/dist/hello';
-    const cloudcmdPath = DIR + 'cloudcmd';
+    const cloudcmdPath = `${DIR}cloudcmd`;
     
     const reset = cleanNodeEnv();
     const {_replaceDist} = reRequire(cloudcmdPath);
diff --git a/server/config.js b/server/config.js
index 7f3783d8..56a39956 100644
--- a/server/config.js
+++ b/server/config.js
@@ -1,15 +1,15 @@
 'use strict';
 
-const DIR_SERVER = __dirname + '/';
+const DIR_SERVER = `${__dirname}/`;
 const DIR_COMMON = '../common/';
 const path = require('path');
 
 const fs = require('fs');
 const Emitter = require('events');
 const {homedir} = require('os');
-const exit = require(DIR_SERVER + 'exit');
+const exit = require(`${DIR_SERVER}exit`);
 
-const CloudFunc = require(DIR_COMMON + 'cloudfunc');
+const CloudFunc = require(`${DIR_COMMON}cloudfunc`);
 const currify = require('currify');
 
 const wraptile = require('wraptile');
@@ -21,7 +21,7 @@ const jju = require('jju');
 const writejson = require('writejson');
 const tryCatch = require('try-catch');
 const criton = require('criton');
-const DIR = DIR_SERVER + '../';
+const DIR = `${DIR_SERVER}../`;
 const HOME = homedir();
 
 const resolve = Promise.resolve.bind(Promise);
@@ -146,7 +146,7 @@ function _connection(manage, socket) {
 function listen(manage, sock, auth) {
     const prefix = manage('prefixSocket');
     
-    sock.of(prefix + '/config')
+    sock.of(`${prefix}/config`)
         .on('connection', (socket) => {
             if (!manage('auth'))
                 return connection(manage, socket);
diff --git a/server/config.spec.js b/server/config.spec.js
index 6bca55cd..0d4f41b3 100644
--- a/server/config.spec.js
+++ b/server/config.spec.js
@@ -12,7 +12,7 @@ const {
     createConfig,
     _cryptoPass,
 } = require(configPath);
-const {apiURL} = require(root + 'common/cloudfunc');
+const {apiURL} = require(`${root}common/cloudfunc`);
 
 const fixture = require('./config.fixture');
 
diff --git a/server/markdown/index.js b/server/markdown/index.js
index 14616dc8..eda34ce7 100644
--- a/server/markdown/index.js
+++ b/server/markdown/index.js
@@ -17,7 +17,7 @@ threadIt.init();
 // warm up
 parse('');
 
-const DIR_ROOT = __dirname + '/../../';
+const DIR_ROOT = `${__dirname}/../../`;
 
 module.exports = callbackify(async (name, rootDir, request) => {
     check(name, request);
diff --git a/server/prefixer.js b/server/prefixer.js
index 47675070..43d1af28 100644
--- a/server/prefixer.js
+++ b/server/prefixer.js
@@ -8,7 +8,7 @@ module.exports = (value) => {
         return '';
     
     if (value && !value.includes('/'))
-        return '/' + value;
+        return `/${value}`;
     
     return value;
 };
diff --git a/server/rest/index.js b/server/rest/index.js
index 4f60bcfa..a5eb9187 100644
--- a/server/rest/index.js
+++ b/server/rest/index.js
@@ -1,14 +1,14 @@
 'use strict';
 
 const DIR = '../';
-const DIR_COMMON = DIR + '../common/';
+const DIR_COMMON = `${DIR}../common/`;
 
 const path = require('path');
 const fs = require('fs');
 
-const root = require(DIR + 'root');
-const CloudFunc = require(DIR_COMMON + 'cloudfunc');
-const markdown = require(DIR + 'markdown');
+const root = require(`${DIR}root`);
+const CloudFunc = require(`${DIR_COMMON}cloudfunc`);
+const markdown = require(`${DIR}markdown`);
 const info = require('./info');
 
 const jaguar = require('jaguar');
@@ -36,7 +36,7 @@ const UserError = (msg) => {
 
 module.exports = currify((config, request, response, next) => {
     const name = ponse.getPathName(request);
-    const regExp = RegExp('^' + apiURL);
+    const regExp = RegExp(`^${apiURL}`);
     const is = regExp.test(name);
     
     if (!is)
diff --git a/server/route.js b/server/route.js
index 4978b0b3..04fec405 100644
--- a/server/route.js
+++ b/server/route.js
@@ -16,9 +16,9 @@ const once = require('once');
 const pipe = require('pipe-io');
 const {contentType} = require('mime-types');
 
-const root = require(DIR_SERVER + 'root');
-const prefixer = require(DIR_SERVER + 'prefixer');
-const CloudFunc = require(DIR_COMMON + 'cloudfunc');
+const root = require(`${DIR_SERVER}root`);
+const prefixer = require(`${DIR_SERVER}prefixer`);
+const CloudFunc = require(`${DIR_COMMON}cloudfunc`);
 
 const Columns = require(`${DIR_SERVER}/columns`);
 
@@ -52,7 +52,7 @@ const getReadDir = (config) => {
  */
 module.exports = currify((config, options, request, response, next) => {
     const name = ponse.getPathName(request);
-    const isFS = RegExp('^/$|^' + FS).test(name);
+    const isFS = RegExp(`^/$|^${FS}`).test(name);
     
     if (!isFS)
         return next();
diff --git a/server/server.mjs b/server/server.mjs
index 98de22cf..fb6985b4 100644
--- a/server/server.mjs
+++ b/server/server.mjs
@@ -46,7 +46,7 @@ export default async (options, config) => {
         app.use(logger('dev'));
     
     if (prefix)
-        app.get('/', (req, res) => res.redirect(prefix + '/'));
+        app.get('/', (req, res) => res.redirect(`${prefix}/`));
     
     const socketServer = new Server(server, {
         path: `${prefix}/socket.io`,
diff --git a/test/common/cloudfunc.js b/test/common/cloudfunc.js
index 9ce6de77..b65c8817 100644
--- a/test/common/cloudfunc.js
+++ b/test/common/cloudfunc.js
@@ -3,14 +3,14 @@
 const fs = require('fs');
 const tryCatch = require('try-catch');
 
-const DIR = __dirname + '/../../';
-const COMMONDIR = DIR + 'common/';
+const DIR = `${__dirname}/../../`;
+const COMMONDIR = `${DIR}common/`;
 const {
     time,
     timeEnd,
-} = require(COMMONDIR + 'util');
+} = require(`${COMMONDIR}util`);
 
-const CloudFuncPath = COMMONDIR + 'cloudfunc';
+const CloudFuncPath = `${COMMONDIR}cloudfunc`;
 
 const CloudFunc = require(CloudFuncPath);
 
@@ -20,10 +20,10 @@ const {reRequire} = require('mock-require');
 const htmlLooksLike = require('html-looks-like');
 
 const readFilesSync = require('@cloudcmd/read-files-sync');
-const TMPLDIR = DIR + 'tmpl/';
+const TMPLDIR = `${DIR}tmpl/`;
 
-const FS_DIR = TMPLDIR + 'fs/';
-const EXPECT_PATH = __dirname + '/cloudfunc.html';
+const FS_DIR = `${TMPLDIR}fs/`;
+const EXPECT_PATH = `${__dirname}/cloudfunc.html`;
 
 const addHBS = (a) => `${a}.hbs`;
 const TMPL = [
diff --git a/test/rest/move.js b/test/rest/move.js
index 1d8343da..e0c1aeb0 100644
--- a/test/rest/move.js
+++ b/test/rest/move.js
@@ -11,8 +11,8 @@ const serveOnce = require('serve-once');
 const {reRequire, stopAll} = mockRequire;
 
 const cloudcmdPath = '../../';
-const dir = cloudcmdPath + 'server/';
-const restPath = dir + 'rest';
+const dir = `${cloudcmdPath}server/`;
+const restPath = `${dir}rest`;
 
 const {assign} = Object;
 
diff --git a/test/rest/pack.js b/test/rest/pack.js
index 96ca2c00..57ccd867 100644
--- a/test/rest/pack.js
+++ b/test/rest/pack.js
@@ -61,7 +61,7 @@ test('cloudcmd: rest: pack: tar: get', async (t) => {
     
     const [, stream] = await once('entry', extract);
     const data = await pullout(stream);
-    const file = fs.readFileSync(__dirname + '/../fixture/pack', 'utf8');
+    const file = fs.readFileSync(`${__dirname}/../fixture/pack`, 'utf8');
     
     t.equal(file, data, 'should pack data');
     t.end();
@@ -76,7 +76,7 @@ test('cloudcmd: rest: pack: tar: put: file', async (t) => {
         config,
     };
     
-    const name = String(Math.random()) + '.tar.gz';
+    const name = `${Math.random()}.tar.gz`;
     
     const {request} = serveOnce(cloudcmd, defaultOptions);
     
@@ -92,7 +92,7 @@ test('cloudcmd: rest: pack: tar: put: file', async (t) => {
     
     const [, stream] = await once('entry', extract);
     const data = await pullout(stream, 'buffer');
-    const result = fs.readFileSync(__dirname + '/../fixture/pack');
+    const result = fs.readFileSync(`${__dirname}/../fixture/pack`);
     
     fs.unlinkSync(`${__dirname}/../${name}`);
     
@@ -109,7 +109,7 @@ test('cloudcmd: rest: pack: tar: put: response', async (t) => {
         config,
     };
     
-    const name = String(Math.random()) + '.tar.gz';
+    const name = `${Math.random()}.tar.gz`;
     const {body} = await request.put(`/api/v1/pack`, {
         options,
         body: getPackOptions(name),
diff --git a/test/rest/rename.js b/test/rest/rename.js
index 823e6c27..1f358c52 100644
--- a/test/rest/rename.js
+++ b/test/rest/rename.js
@@ -11,8 +11,8 @@ const serveOnce = require('serve-once');
 const {reRequire, stopAll} = mockRequire;
 
 const cloudcmdPath = '../../';
-const dir = cloudcmdPath + 'server/';
-const restPath = dir + 'rest';
+const dir = `${cloudcmdPath}server/`;
+const restPath = `${dir}rest`;
 
 test('cloudcmd: rest: rename', async (t) => {
     const volume = {