diff --git a/src/bin/extractPadData.js b/src/bin/extractPadData.js
index 0688245d..353c5d21 100644
--- a/src/bin/extractPadData.js
+++ b/src/bin/extractPadData.js
@@ -10,6 +10,8 @@
 // unhandled rejection into an uncaught exception, which does cause Node.js to exit.
 process.on('unhandledRejection', (err) => { throw err; });
 
+const util = require('util');
+
 if (process.argv.length !== 3) throw new Error('Use: node extractPadData.js $PADID');
 
 // get the padID
diff --git a/src/bin/importSqlFile.js b/src/bin/importSqlFile.js
index 5a052088..b7e3a16c 100644
--- a/src/bin/importSqlFile.js
+++ b/src/bin/importSqlFile.js
@@ -4,6 +4,8 @@
 // unhandled rejection into an uncaught exception, which does cause Node.js to exit.
 process.on('unhandledRejection', (err) => { throw err; });
 
+const util = require('util');
+
 const startTime = Date.now();
 
 const log = (str) => {
diff --git a/src/node/db/API.js b/src/node/db/API.js
index c262e078..f119f584 100644
--- a/src/node/db/API.js
+++ b/src/node/db/API.js
@@ -831,7 +831,7 @@ exports.getStats = async () => {
 const isInt = (value) => (parseFloat(value) === parseInt(value, 10)) && !isNaN(value);
 
 // gets a pad safe
-async function getPadSafe(padID, shouldExist, text) {
+const getPadSafe = async (padID, shouldExist, text) => {
   // check if padID is a string
   if (typeof padID !== 'string') {
     throw new CustomError('padID is not a string', 'apierror');
@@ -857,7 +857,7 @@ async function getPadSafe(padID, shouldExist, text) {
 
   // pad exists, let's get it
   return padManager.getPad(padID, text);
-}
+};
 
 // checks if a rev is a legal number
 // pre-condition is that `rev` is not undefined
diff --git a/src/node/db/AuthorManager.js b/src/node/db/AuthorManager.js
index e457b7eb..2a354d42 100644
--- a/src/node/db/AuthorManager.js
+++ b/src/node/db/AuthorManager.js
@@ -135,7 +135,7 @@ exports.createAuthorIfNotExistsFor = async (authorMapper, name) => {
  * @param {String} mapperkey The database key name for this mapper
  * @param {String} mapper The mapper
  */
-async function mapAuthorWithDBKey(mapperkey, mapper) {
+const mapAuthorWithDBKey = async (mapperkey, mapper) => {
   // try to map to an author
   const author = await db.get(`${mapperkey}:${mapper}`);
 
@@ -156,7 +156,7 @@ async function mapAuthorWithDBKey(mapperkey, mapper) {
 
   // return the author
   return {authorID: author};
-}
+};
 
 /**
  * Internal function that creates the database entry for an author
diff --git a/src/node/db/DB.js b/src/node/db/DB.js
index e1097e90..fbf71f88 100644
--- a/src/node/db/DB.js
+++ b/src/node/db/DB.js
@@ -29,7 +29,7 @@ const util = require('util');
 
 // set database settings
 const db =
-    new ueberDB.database(settings.dbType, settings.dbSettings, null, log4js.getLogger('ueberDB'));
+    new ueberDB.Database(settings.dbType, settings.dbSettings, null, log4js.getLogger('ueberDB'));
 
 /**
  * The UeberDB Object that provides the database functions
diff --git a/src/node/db/Pad.js b/src/node/db/Pad.js
index a3466898..db35daf1 100644
--- a/src/node/db/Pad.js
+++ b/src/node/db/Pad.js
@@ -32,7 +32,7 @@ exports.cleanText = (txt) => txt.replace(/\r\n/g, '\n')
     .replace(/\t/g, '        ')
     .replace(/\xa0/g, ' ');
 
-const Pad = function Pad(id) {
+const Pad = function (id) {
   this.atext = Changeset.makeAText('\n');
   this.pool = new AttributePool();
   this.head = -1;
@@ -44,32 +44,29 @@ const Pad = function Pad(id) {
 
 exports.Pad = Pad;
 
-Pad.prototype.apool = function apool() {
+Pad.prototype.apool = function () {
   return this.pool;
 };
 
-Pad.prototype.getHeadRevisionNumber = function getHeadRevisionNumber() {
+Pad.prototype.getHeadRevisionNumber = function () {
   return this.head;
 };
 
-Pad.prototype.getSavedRevisionsNumber = function getSavedRevisionsNumber() {
+Pad.prototype.getSavedRevisionsNumber = function () {
   return this.savedRevisions.length;
 };
 
-Pad.prototype.getSavedRevisionsList = function getSavedRevisionsList() {
-  const savedRev = [];
-  for (const rev in this.savedRevisions) {
-    savedRev.push(this.savedRevisions[rev].revNum);
-  }
+Pad.prototype.getSavedRevisionsList = function () {
+  const savedRev = this.savedRevisions.map((rev) => rev.revNum);
   savedRev.sort((a, b) => a - b);
   return savedRev;
 };
 
-Pad.prototype.getPublicStatus = function getPublicStatus() {
+Pad.prototype.getPublicStatus = function () {
   return this.publicStatus;
 };
 
-Pad.prototype.appendRevision = async function appendRevision(aChangeset, author) {
+Pad.prototype.appendRevision = async function (aChangeset, author) {
   if (!author) {
     author = '';
   }
@@ -115,7 +112,7 @@ Pad.prototype.appendRevision = async function appendRevision(aChangeset, author)
 };
 
 // save all attributes to the database
-Pad.prototype.saveToDatabase = async function saveToDatabase() {
+Pad.prototype.saveToDatabase = async function () {
   const dbObject = {};
 
   for (const attr in this) {
@@ -133,24 +130,24 @@ Pad.prototype.saveToDatabase = async function saveToDatabase() {
 };
 
 // get time of last edit (changeset application)
-Pad.prototype.getLastEdit = function getLastEdit() {
+Pad.prototype.getLastEdit = function () {
   const revNum = this.getHeadRevisionNumber();
   return db.getSub(`pad:${this.id}:revs:${revNum}`, ['meta', 'timestamp']);
 };
 
-Pad.prototype.getRevisionChangeset = function getRevisionChangeset(revNum) {
+Pad.prototype.getRevisionChangeset = function (revNum) {
   return db.getSub(`pad:${this.id}:revs:${revNum}`, ['changeset']);
 };
 
-Pad.prototype.getRevisionAuthor = function getRevisionAuthor(revNum) {
+Pad.prototype.getRevisionAuthor = function (revNum) {
   return db.getSub(`pad:${this.id}:revs:${revNum}`, ['meta', 'author']);
 };
 
-Pad.prototype.getRevisionDate = function getRevisionDate(revNum) {
+Pad.prototype.getRevisionDate = function (revNum) {
   return db.getSub(`pad:${this.id}:revs:${revNum}`, ['meta', 'timestamp']);
 };
 
-Pad.prototype.getAllAuthors = function getAllAuthors() {
+Pad.prototype.getAllAuthors = function () {
   const authors = [];
 
   for (const key in this.pool.numToAttrib) {
@@ -162,7 +159,7 @@ Pad.prototype.getAllAuthors = function getAllAuthors() {
   return authors;
 };
 
-Pad.prototype.getInternalRevisionAText = async function getInternalRevisionAText(targetRev) {
+Pad.prototype.getInternalRevisionAText = async function (targetRev) {
   const keyRev = this.getKeyRevisionNumber(targetRev);
 
   // find out which changesets are needed
@@ -197,11 +194,11 @@ Pad.prototype.getInternalRevisionAText = async function getInternalRevisionAText
   return atext;
 };
 
-Pad.prototype.getRevision = function getRevisionChangeset(revNum) {
+Pad.prototype.getRevision = function (revNum) {
   return db.get(`pad:${this.id}:revs:${revNum}`);
 };
 
-Pad.prototype.getAllAuthorColors = async function getAllAuthorColors() {
+Pad.prototype.getAllAuthorColors = async function () {
   const authors = this.getAllAuthors();
   const returnTable = {};
   const colorPalette = authorManager.getColorPalette();
@@ -215,7 +212,7 @@ Pad.prototype.getAllAuthorColors = async function getAllAuthorColors() {
   return returnTable;
 };
 
-Pad.prototype.getValidRevisionRange = function getValidRevisionRange(startRev, endRev) {
+Pad.prototype.getValidRevisionRange = function (startRev, endRev) {
   startRev = parseInt(startRev, 10);
   const head = this.getHeadRevisionNumber();
   endRev = endRev ? parseInt(endRev, 10) : head;
@@ -236,15 +233,15 @@ Pad.prototype.getValidRevisionRange = function getValidRevisionRange(startRev, e
   return null;
 };
 
-Pad.prototype.getKeyRevisionNumber = function getKeyRevisionNumber(revNum) {
+Pad.prototype.getKeyRevisionNumber = function (revNum) {
   return Math.floor(revNum / 100) * 100;
 };
 
-Pad.prototype.text = function text() {
+Pad.prototype.text = function () {
   return this.atext.text;
 };
 
-Pad.prototype.setText = async function setText(newText) {
+Pad.prototype.setText = async function (newText) {
   // clean the new text
   newText = exports.cleanText(newText);
 
@@ -264,7 +261,7 @@ Pad.prototype.setText = async function setText(newText) {
   await this.appendRevision(changeset);
 };
 
-Pad.prototype.appendText = async function appendText(newText) {
+Pad.prototype.appendText = async function (newText) {
   // clean the new text
   newText = exports.cleanText(newText);
 
@@ -277,7 +274,7 @@ Pad.prototype.appendText = async function appendText(newText) {
   await this.appendRevision(changeset);
 };
 
-Pad.prototype.appendChatMessage = async function appendChatMessage(text, userId, time) {
+Pad.prototype.appendChatMessage = async function (text, userId, time) {
   this.chatHead++;
   // save the chat entry in the database
   await Promise.all([
@@ -286,7 +283,7 @@ Pad.prototype.appendChatMessage = async function appendChatMessage(text, userId,
   ]);
 };
 
-Pad.prototype.getChatMessage = async function getChatMessage(entryNum) {
+Pad.prototype.getChatMessage = async function (entryNum) {
   // get the chat entry
   const entry = await db.get(`pad:${this.id}:chat:${entryNum}`);
 
@@ -298,7 +295,7 @@ Pad.prototype.getChatMessage = async function getChatMessage(entryNum) {
   return entry;
 };
 
-Pad.prototype.getChatMessages = async function getChatMessages(start, end) {
+Pad.prototype.getChatMessages = async function (start, end) {
   // collect the numbers of chat entries and in which order we need them
   const neededEntries = [];
   for (let order = 0, entryNum = start; entryNum <= end; ++order, ++entryNum) {
@@ -326,7 +323,7 @@ Pad.prototype.getChatMessages = async function getChatMessages(start, end) {
   return cleanedEntries;
 };
 
-Pad.prototype.init = async function init(text) {
+Pad.prototype.init = async function (text) {
   // replace text with default text if text isn't set
   if (text == null) {
     text = settings.defaultPadText;
@@ -355,8 +352,7 @@ Pad.prototype.init = async function init(text) {
   hooks.callAll('padLoad', {pad: this});
 };
 
-Pad.prototype.copy = async function copy(destinationID, force) {
-  let destGroupID;
+Pad.prototype.copy = async function (destinationID, force) {
   const sourceID = this.id;
 
   // Kick everyone from this pad.
@@ -367,16 +363,11 @@ Pad.prototype.copy = async function copy(destinationID, force) {
   // flush the source pad:
   await this.saveToDatabase();
 
+  // if it's a group pad, let's make sure the group exists.
+  const destGroupID = await this.checkIfGroupExistAndReturnIt(destinationID);
 
-  try {
-    // if it's a group pad, let's make sure the group exists.
-    destGroupID = await this.checkIfGroupExistAndReturnIt(destinationID);
-
-    // if force is true and already exists a Pad with the same id, remove that Pad
-    await this.removePadIfForceIsTrueAndAlreadyExist(destinationID, force);
-  } catch (err) {
-    throw err;
-  }
+  // if force is true and already exists a Pad with the same id, remove that Pad
+  await this.removePadIfForceIsTrueAndAlreadyExist(destinationID, force);
 
   // copy the 'pad' entry
   const pad = await db.get(`pad:${sourceID}`);
@@ -423,7 +414,7 @@ Pad.prototype.copy = async function copy(destinationID, force) {
   return {padID: destinationID};
 };
 
-Pad.prototype.checkIfGroupExistAndReturnIt = async function checkIfGroupExistAndReturnIt(destinationID) {
+Pad.prototype.checkIfGroupExistAndReturnIt = async function (destinationID) {
   let destGroupID = false;
 
   if (destinationID.indexOf('$') >= 0) {
@@ -438,7 +429,7 @@ Pad.prototype.checkIfGroupExistAndReturnIt = async function checkIfGroupExistAnd
   return destGroupID;
 };
 
-Pad.prototype.removePadIfForceIsTrueAndAlreadyExist = async function removePadIfForceIsTrueAndAlreadyExist(destinationID, force) {
+Pad.prototype.removePadIfForceIsTrueAndAlreadyExist = async function (destinationID, force) {
   // if the pad exists, we should abort, unless forced.
   const exists = await padManager.doesPadExist(destinationID);
 
@@ -461,29 +452,24 @@ Pad.prototype.removePadIfForceIsTrueAndAlreadyExist = async function removePadIf
   }
 };
 
-Pad.prototype.copyAuthorInfoToDestinationPad = function copyAuthorInfoToDestinationPad(destinationID) {
+Pad.prototype.copyAuthorInfoToDestinationPad = function (destinationID) {
   // add the new sourcePad to all authors who contributed to the old one
   this.getAllAuthors().forEach((authorID) => {
     authorManager.addPad(authorID, destinationID);
   });
 };
 
-Pad.prototype.copyPadWithoutHistory = async function copyPadWithoutHistory(destinationID, force) {
-  let destGroupID;
+Pad.prototype.copyPadWithoutHistory = async function (destinationID, force) {
   const sourceID = this.id;
 
   // flush the source pad
   this.saveToDatabase();
 
-  try {
-    // if it's a group pad, let's make sure the group exists.
-    destGroupID = await this.checkIfGroupExistAndReturnIt(destinationID);
+  // if it's a group pad, let's make sure the group exists.
+  const destGroupID = await this.checkIfGroupExistAndReturnIt(destinationID);
 
-    // if force is true and already exists a Pad with the same id, remove that Pad
-    await this.removePadIfForceIsTrueAndAlreadyExist(destinationID, force);
-  } catch (err) {
-    throw err;
-  }
+  // if force is true and already exists a Pad with the same id, remove that Pad
+  await this.removePadIfForceIsTrueAndAlreadyExist(destinationID, force);
 
   const sourcePad = await padManager.getPad(sourceID);
 
@@ -526,7 +512,7 @@ Pad.prototype.copyPadWithoutHistory = async function copyPadWithoutHistory(desti
 };
 
 
-Pad.prototype.remove = async function remove() {
+Pad.prototype.remove = async function () {
   const padID = this.id;
   const p = [];
 
@@ -579,12 +565,12 @@ Pad.prototype.remove = async function remove() {
 };
 
 // set in db
-Pad.prototype.setPublicStatus = async function setPublicStatus(publicStatus) {
+Pad.prototype.setPublicStatus = async function (publicStatus) {
   this.publicStatus = publicStatus;
   await this.saveToDatabase();
 };
 
-Pad.prototype.addSavedRevision = async function addSavedRevision(revNum, savedById, label) {
+Pad.prototype.addSavedRevision = async function (revNum, savedById, label) {
   // if this revision is already saved, return silently
   for (const i in this.savedRevisions) {
     if (this.savedRevisions[i] && this.savedRevisions[i].revNum === revNum) {
@@ -605,6 +591,6 @@ Pad.prototype.addSavedRevision = async function addSavedRevision(revNum, savedBy
   await this.saveToDatabase();
 };
 
-Pad.prototype.getSavedRevisions = function getSavedRevisions() {
+Pad.prototype.getSavedRevisions = function () {
   return this.savedRevisions;
 };
diff --git a/src/node/db/SessionManager.js b/src/node/db/SessionManager.js
index d46ed9fa..9a222e2f 100644
--- a/src/node/db/SessionManager.js
+++ b/src/node/db/SessionManager.js
@@ -250,7 +250,7 @@ const listSessionsWithDBKey = async (dbkey) => {
   const sessions = sessionObject ? sessionObject.sessionIDs : null;
 
   // iterate through the sessions and get the sessioninfos
-  for (const sessionID in sessions) {
+  for (const sessionID of Object.keys(sessions || {})) {
     try {
       const sessionInfo = await exports.getSessionInfo(sessionID);
       sessions[sessionID] = sessionInfo;
diff --git a/src/node/easysync_tests.js b/src/node/easysync_tests.js
index 78d9f61e..25a70e02 100644
--- a/src/node/easysync_tests.js
+++ b/src/node/easysync_tests.js
@@ -42,7 +42,7 @@ const runTests = () => {
 
   const literal = (v) => {
     if ((typeof v) === 'string') {
-      return `"${v.replace(/[\\\"]/g, '\\$1').replace(/\n/g, '\\n')}"`;
+      return `"${v.replace(/[\\"]/g, '\\$1').replace(/\n/g, '\\n')}"`;
     } else { return JSON.stringify(v); }
   };
 
diff --git a/src/node/utils/Settings.js b/src/node/utils/Settings.js
index 38ac5bce..e5b1636d 100644
--- a/src/node/utils/Settings.js
+++ b/src/node/utils/Settings.js
@@ -141,7 +141,7 @@ exports.padOptions = {
   alwaysShowChat: false,
   chatAndUsers: false,
   lang: 'en-gb',
-},
+};
 
 /**
  * Whether certain shortcut keys are enabled for a user in the pad
@@ -169,7 +169,7 @@ exports.padShortcutEnabled = {
   ctrlHome: true,
   pageUp: true,
   pageDown: true,
-},
+};
 
 /**
  * The toolbar buttons and order.
@@ -466,7 +466,7 @@ exports.getEpVersion = () => require('../../package.json').version;
  * both "settings.json" and "credentials.json".
  */
 const storeSettings = (settingsObj) => {
-  for (const i in settingsObj) {
+  for (const i of Object.keys(settingsObj || {})) {
     // test if the setting starts with a lowercase character
     if (i.charAt(0).search('[a-z]') !== 0) {
       console.warn(`Settings should start with a lowercase character: '${i}'`);