diff --git a/js/src/api/local/accounts/accounts.js b/js/src/api/local/accounts/accounts.js
index 1bce1329a..e7e5cc397 100644
--- a/js/src/api/local/accounts/accounts.js
+++ b/js/src/api/local/accounts/accounts.js
@@ -39,7 +39,8 @@ export default class Accounts {
   create (secret, password) {
     const privateKey = Buffer.from(secret.slice(2), 'hex');
 
-    return Account.fromPrivateKey(this.persist, privateKey, password)
+    return Account
+      .fromPrivateKey(this.persist, privateKey, password)
       .then((account) => {
         const { address } = account;
 
@@ -87,7 +88,8 @@ export default class Accounts {
       return false;
     }
 
-    return account.isValidPassword(password)
+    return account
+      .isValidPassword(password)
       .then((isValid) => {
         if (!isValid) {
           return false;
diff --git a/js/src/api/local/ethkey/index.js b/js/src/api/local/ethkey/index.js
index 4539c8c50..a6967da25 100644
--- a/js/src/api/local/ethkey/index.js
+++ b/js/src/api/local/ethkey/index.js
@@ -22,7 +22,8 @@ export function createKeyObject (key, password) {
 }
 
 export function decryptPrivateKey (keyObject, password) {
-  return workerPool.getWorker()
+  return workerPool
+    .getWorker()
     .action('decryptPrivateKey', { keyObject, password })
     .then((privateKey) => {
       if (privateKey) {
diff --git a/js/src/api/local/ethkey/worker.js b/js/src/api/local/ethkey/worker.js
index 3a0c34f7d..00f4a0bed 100644
--- a/js/src/api/local/ethkey/worker.js
+++ b/js/src/api/local/ethkey/worker.js
@@ -16,6 +16,7 @@
 
 import secp256k1 from 'secp256k1/js';
 import { keccak_256 as keccak256 } from 'js-sha3';
+import { bytesToHex } from '~/api/util/format';
 
 const isWorker = typeof self !== 'undefined';
 
@@ -107,10 +108,6 @@ const actions = {
   }
 };
 
-function bytesToHex (bytes) {
-  return '0x' + Array.from(bytes).map(n => ('0' + n.toString(16)).slice(-2)).join('');
-}
-
 self.onmessage = function ({ data }) {
   const result = route(data);
 
diff --git a/js/src/api/local/middleware.js b/js/src/api/local/middleware.js
index ece3fa17d..36a8cd2cf 100644
--- a/js/src/api/local/middleware.js
+++ b/js/src/api/local/middleware.js
@@ -60,7 +60,8 @@ export default class LocalAccountsMiddleware extends Middleware {
     register('parity_changePassword', ([address, oldPassword, newPassword]) => {
       const account = accounts.get(address);
 
-      return account.decryptPrivateKey(oldPassword)
+      return account
+        .decryptPrivateKey(oldPassword)
         .then((privateKey) => {
           if (!privateKey) {
             return false;
diff --git a/js/src/api/util/format.js b/js/src/api/util/format.js
index c7594b692..61fc9d32c 100644
--- a/js/src/api/util/format.js
+++ b/js/src/api/util/format.js
@@ -17,7 +17,7 @@
 import { range } from 'lodash';
 
 export function bytesToHex (bytes) {
-  return '0x' + bytes.map((b) => ('0' + b.toString(16)).slice(-2)).join('');
+  return '0x' + Buffer.from(bytes).toString('hex');
 }
 
 export function cleanupValue (value, type) {
diff --git a/js/src/modals/CreateAccount/NewAccount/newAccount.spec.js b/js/src/modals/CreateAccount/NewAccount/newAccount.spec.js
index d6d38779f..935fe5b80 100644
--- a/js/src/modals/CreateAccount/NewAccount/newAccount.spec.js
+++ b/js/src/modals/CreateAccount/NewAccount/newAccount.spec.js
@@ -60,7 +60,6 @@ describe('modals/CreateAccount/NewAccount', () => {
 
       it('resets the accounts', () => {
         expect(instance.state.accounts).to.be.null;
-        // expect(Object.keys(instance.state.accounts).length).to.equal(7);
       });
 
       it('resets the initial selected value', () => {