diff --git a/Chapter07/leveldb-app/tasks.js b/Chapter07/leveldb-app/tasks.js
index eaa6db4..4f04cef 100644
--- a/Chapter07/leveldb-app/tasks.js
+++ b/Chapter07/leveldb-app/tasks.js
@@ -1,26 +1,26 @@
-const levelup = require('levelup')
-const leveldown = require('leveldown')
+const levelup = require("levelup");
+const leveldown = require("leveldown");
 
-const db = levelup(leveldown('./data'))
+const db = levelup(leveldown("./data"));
 
-const task = process.argv[2]
+const task = process.argv[2];
 
 if (!task) {
-    listTasks()
+  listTasks();
 } else {
-    addTask()
+  addTask();
 }
 
 function addTask() {
-    const key = `Task: ${Math.random().toString(32).replace('.', '')}`
-    db.put(key, task, (err) => {
-        if (err) throw err
-        listTasks()
-    })
+  const key = `Task: ${Math.random().toString(32).replace(".", "")}`;
+  db.put(key, task, (err) => {
+    if (err) throw err;
+    listTasks();
+  });
 }
 
 function listTasks() {
-    db.createReadStream().on('data', (data) => {
-        console.log(data.key.toString(), '=', data.value.toString())
-    })
-}
\ No newline at end of file
+  db.createReadStream().on("data", (data) => {
+    console.log(data.key.toString(), "=", data.value.toString());
+  });
+}
diff --git a/Chapter07/leveldb-filter/filter.js b/Chapter07/leveldb-filter/filter.js
index eed5950..e0b73ea 100644
--- a/Chapter07/leveldb-filter/filter.js
+++ b/Chapter07/leveldb-filter/filter.js
@@ -1,25 +1,21 @@
-const levelup = require('levelup')
-const leveldown = require('leveldown')
-const db = levelup(leveldown('./data'))
+const levelup = require("levelup");
+const leveldown = require("leveldown");
+const db = levelup(leveldown("./data"));
 
-db.put('Task:1', '')
-db.put('Task:2', '')
-db.put('Task:3', '')
-db.put('Task:4', '')
+db.put("Task:1", "");
+db.put("Task:2", "");
+db.put("Task:3", "");
+db.put("Task:4", "");
 
 db.createReadStream({
-    gte: 'Task:1',
-    lte: 'Task:3'
-}).on('data', function (data) {
-    console.log(data.key.toString())
-})
-
-
-
-  
+  gte: "Task:1",
+  lte: "Task:3",
+}).on("data", function (data) {
+  console.log(data.key.toString());
+});
 
 db.batch()
-  .put('forename', 'Beth')
-  .put('surname', 'Griggs')
-  .del('forename')
-  .write(() => console.log('Batch operations complete.'))
\ No newline at end of file
+  .put("forename", "Beth")
+  .put("surname", "Griggs")
+  .del("forename")
+  .write(() => console.log("Batch operations complete."));
diff --git a/Chapter07/leveldb-memdown-app/tasks.js b/Chapter07/leveldb-memdown-app/tasks.js
index eaa6db4..4f04cef 100644
--- a/Chapter07/leveldb-memdown-app/tasks.js
+++ b/Chapter07/leveldb-memdown-app/tasks.js
@@ -1,26 +1,26 @@
-const levelup = require('levelup')
-const leveldown = require('leveldown')
+const levelup = require("levelup");
+const leveldown = require("leveldown");
 
-const db = levelup(leveldown('./data'))
+const db = levelup(leveldown("./data"));
 
-const task = process.argv[2]
+const task = process.argv[2];
 
 if (!task) {
-    listTasks()
+  listTasks();
 } else {
-    addTask()
+  addTask();
 }
 
 function addTask() {
-    const key = `Task: ${Math.random().toString(32).replace('.', '')}`
-    db.put(key, task, (err) => {
-        if (err) throw err
-        listTasks()
-    })
+  const key = `Task: ${Math.random().toString(32).replace(".", "")}`;
+  db.put(key, task, (err) => {
+    if (err) throw err;
+    listTasks();
+  });
 }
 
 function listTasks() {
-    db.createReadStream().on('data', (data) => {
-        console.log(data.key.toString(), '=', data.value.toString())
-    })
-}
\ No newline at end of file
+  db.createReadStream().on("data", (data) => {
+    console.log(data.key.toString(), "=", data.value.toString());
+  });
+}
diff --git a/Chapter07/leveldb-sql-app/tasks.js b/Chapter07/leveldb-sql-app/tasks.js
index 2d41156..ad97703 100644
--- a/Chapter07/leveldb-sql-app/tasks.js
+++ b/Chapter07/leveldb-sql-app/tasks.js
@@ -1,26 +1,26 @@
-const levelup = require('levelup')
-const memdown = require('memdown')
+const levelup = require("levelup");
+const memdown = require("memdown");
 
-const db = levelup(memdown('./data'))
+const db = levelup(memdown("./data"));
 
-const task = process.argv[2]
+const task = process.argv[2];
 
 if (!task) {
-    listTasks()
+  listTasks();
 } else {
-    addTask()
+  addTask();
 }
 
 function addTask() {
-    const key = `Task: ${Math.random().toString(32).replace('.', '')}`
-    db.put(key, task, (err) => {
-        if (err) throw err
-        listTasks()
-    })
+  const key = `Task: ${Math.random().toString(32).replace(".", "")}`;
+  db.put(key, task, (err) => {
+    if (err) throw err;
+    listTasks();
+  });
 }
 
 function listTasks() {
-    db.createReadStream().on('data', (data) => {
-        console.log(data.key.toString(), '=', data.value.toString())
-    })
-}
\ No newline at end of file
+  db.createReadStream().on("data", (data) => {
+    console.log(data.key.toString(), "=", data.value.toString());
+  });
+}
diff --git a/Chapter07/mongodb-app/tasks.js b/Chapter07/mongodb-app/tasks.js
index 8314493..dce4126 100644
--- a/Chapter07/mongodb-app/tasks.js
+++ b/Chapter07/mongodb-app/tasks.js
@@ -1,42 +1,47 @@
-const {
-    MongoClient
-} = require('mongodb')
-const task = process.argv[2]
+const { MongoClient } = require("mongodb");
+const task = process.argv[2];
 
-const URI = 'mongodb://localhost:27017/'
+const URI = "mongodb://localhost:27017/";
 
-MongoClient.connect(URI, {
-    useUnifiedTopology: true
-}, connected)
+MongoClient.connect(
+  URI,
+  {
+    useUnifiedTopology: true,
+  },
+  connected
+);
 
 function connected(err, client) {
-    if (err) throw err
-    const tasks = client.db('tasklist').collection('tasks')
+  if (err) throw err;
+  const tasks = client.db("tasklist").collection("tasks");
 
-    if (task) {
-        addTask(client, tasks)
-    } else {
-        listTasks(client, tasks)
-    }
+  if (task) {
+    addTask(client, tasks);
+  } else {
+    listTasks(client, tasks);
+  }
 }
 
 function addTask(client, tasks) {
-    tasks.insertOne({
-        task: task
-    }, (err) => {
-        if (err) throw err
-        console.log("New Task: ", task);
-        listTasks(client, tasks)
-    })
+  tasks.insertOne(
+    {
+      task: task,
+    },
+    (err) => {
+      if (err) throw err;
+      console.log("New Task: ", task);
+      listTasks(client, tasks);
+    }
+  );
 }
 
 function listTasks(client, tasks) {
-    tasks.find().each((err, doc) => {
-        if (err) throw err
-        if (!doc) {
-            client.close()
-            return
-        }
-        console.log(doc)
-    })
-}
\ No newline at end of file
+  tasks.find().each((err, doc) => {
+    if (err) throw err;
+    if (!doc) {
+      client.close();
+      return;
+    }
+    console.log(doc);
+  });
+}
diff --git a/Chapter07/mongoose-app/tasks.js b/Chapter07/mongoose-app/tasks.js
index 80b7579..e974930 100644
--- a/Chapter07/mongoose-app/tasks.js
+++ b/Chapter07/mongoose-app/tasks.js
@@ -1,23 +1,22 @@
-const mongoose = require('mongoose');
-
-const URI = 'mongodb://localhost:27017/customers'
+const mongoose = require("mongoose");
 
+const URI = "mongodb://localhost:27017/customers";
 
 mongoose.connect(URI, {
-    useNewUrlParser: true,
-    useUnifiedTopology: true
-})
+  useNewUrlParser: true,
+  useUnifiedTopology: true,
+});
 
-const Customer = mongoose.model('Customer', {
-    forename: String,
-    surname: String
-})
+const Customer = mongoose.model("Customer", {
+  forename: String,
+  surname: String,
+});
 
 const customer_1 = new Customer({
-    forename: 'Beth',
-    surname: 'Griggs'
-})
+  forename: "Beth",
+  surname: "Griggs",
+});
 
 customer_1.save().then((doc) => {
-    console.log('Added new customer', doc.forename, doc.surname)
-})
\ No newline at end of file
+  console.log("Added new customer", doc.forename, doc.surname);
+});
diff --git a/Chapter07/mysql-app/index.js b/Chapter07/mysql-app/index.js
index 0b0e84a..b346fab 100644
--- a/Chapter07/mysql-app/index.js
+++ b/Chapter07/mysql-app/index.js
@@ -1,38 +1,40 @@
-require('dotenv').config()
-const mysql = require('mysql')
+require("dotenv").config();
+const mysql = require("mysql");
 
 const db = mysql.createConnection({
-    user: process.env.DB_MYSQL_USER,
-    password: process.env.DB_MYSQL_PASSWORD
-})
+  user: process.env.DB_MYSQL_USER,
+  password: process.env.DB_MYSQL_PASSWORD,
+});
 
-db.query('CREATE DATABASE tasks')
-db.query('USE tasks')
+db.query("CREATE DATABASE tasks");
+db.query("USE tasks");
 
 db.query(
-    'CREATE TABLE tasks.tasks (' +
-    'id INT NOT NULL AUTO_INCREMENT, ' +
-    'task TEXT NOT NULL, PRIMARY KEY ( id )' +
-    ')')
+  "CREATE TABLE tasks.tasks (" +
+    "id INT NOT NULL AUTO_INCREMENT, " +
+    "task TEXT NOT NULL, PRIMARY KEY ( id )" +
+    ")"
+);
 
-const ignore = new Set([
-    'ER_DB_CREATE_EXISTS', 'ER_TABLE_EXISTS_ERROR'
-])
+const ignore = new Set(["ER_DB_CREATE_EXISTS", "ER_TABLE_EXISTS_ERROR"]);
 
-db.on('error', (err) => {
-    if (ignore.has(err.code)) return
-    throw err
-})
+db.on("error", (err) => {
+  if (ignore.has(err.code)) return;
+  throw err;
+});
 
 db.query(`
 INSERT INTO tasks.tasks (task)
 VALUES ("Walk the dog"); 
-`)
+`);
 
-db.query(`
+db.query(
+  `
 SELECT * FROM tasks.tasks;
-`, (err, results) => {
-    console.log(results)
-})
+`,
+  (err, results) => {
+    console.log(results);
+  }
+);
 
-db.end()
\ No newline at end of file
+db.end();
diff --git a/Chapter07/mysql-app/insert.js b/Chapter07/mysql-app/insert.js
index 435ad7f..68b2963 100644
--- a/Chapter07/mysql-app/insert.js
+++ b/Chapter07/mysql-app/insert.js
@@ -1,40 +1,45 @@
-require('dotenv').config()
-const mysql = require('mysql')
+require("dotenv").config();
+const mysql = require("mysql");
 
 const db = mysql.createConnection({
-    user: process.env.DB_MYSQL_USER,
-    password: process.env.DB_MYSQL_PASSWORD
-})
+  user: process.env.DB_MYSQL_USER,
+  password: process.env.DB_MYSQL_PASSWORD,
+});
 
-db.query('CREATE DATABASE tasks')
-db.query('USE tasks')
+db.query("CREATE DATABASE tasks");
+db.query("USE tasks");
 
 db.query(
-    'CREATE TABLE tasks.tasks (' +
-    'id INT NOT NULL AUTO_INCREMENT, ' +
-    'task TEXT NOT NULL, PRIMARY KEY ( id )' +
-    ')')
+  "CREATE TABLE tasks.tasks (" +
+    "id INT NOT NULL AUTO_INCREMENT, " +
+    "task TEXT NOT NULL, PRIMARY KEY ( id )" +
+    ")"
+);
 
-const ignore = new Set([
-    'ER_DB_CREATE_EXISTS', 'ER_TABLE_EXISTS_ERROR'
-])
+const ignore = new Set(["ER_DB_CREATE_EXISTS", "ER_TABLE_EXISTS_ERROR"]);
 
-db.on('error', (err) => {
-    if (ignore.has(err.code)) return
-    throw err
-})
+db.on("error", (err) => {
+  if (ignore.has(err.code)) return;
+  throw err;
+});
 
 if (process.argv[2]) {
-    db.query(`
+  db.query(
+    `
         INSERT INTO tasks.tasks (task)
         VALUES (?);
-    `, [process.argv[2]])
+    `,
+    [process.argv[2]]
+  );
 }
 
-db.query(`
+db.query(
+  `
 SELECT * FROM tasks.tasks;
-`, (err, results, fields) => {
-    console.log(results)
-})
+`,
+  (err, results, fields) => {
+    console.log(results);
+  }
+);
 
-db.end()
\ No newline at end of file
+db.end();
diff --git a/Chapter07/postgres-app/tasks.js b/Chapter07/postgres-app/tasks.js
index b750f34..fb68975 100644
--- a/Chapter07/postgres-app/tasks.js
+++ b/Chapter07/postgres-app/tasks.js
@@ -1,32 +1,32 @@
-require('dotenv').config()
-const pg = require('pg')
-const db = new pg.Client()
-const task = process.argv[2]
+require("dotenv").config();
+const pg = require("pg");
+const db = new pg.Client();
+const task = process.argv[2];
 
 const CREATE_TABLE_SQL = `CREATE TABLE IF NOT EXISTS tasks
-                          (id SERIAL, task TEXT NOT NULL, PRIMARY KEY ( id ))`
-const INSERT_TASK_SQL = `INSERT INTO tasks (task) VALUES ($1);`
-const GET_TASKS_SQL = `SELECT * FROM tasks;`
+                          (id SERIAL, task TEXT NOT NULL, PRIMARY KEY ( id ))`;
+const INSERT_TASK_SQL = `INSERT INTO tasks (task) VALUES ($1);`;
+const GET_TASKS_SQL = `SELECT * FROM tasks;`;
 
 db.connect((err) => {
-    if (err) throw err
-    db.query(CREATE_TABLE_SQL, (err) => {
-        if (err) throw err
-        if (task) {
-            db.query(INSERT_TASK_SQL, [task], (err) => {
-                if (err) throw err
-                listTasks()
-            })
-        } else {
-            listTasks()
-        }
-    })
-})
+  if (err) throw err;
+  db.query(CREATE_TABLE_SQL, (err) => {
+    if (err) throw err;
+    if (task) {
+      db.query(INSERT_TASK_SQL, [task], (err) => {
+        if (err) throw err;
+        listTasks();
+      });
+    } else {
+      listTasks();
+    }
+  });
+});
 
 function listTasks() {
-    db.query(GET_TASKS_SQL, (err, results) => {
-        if (err) throw err
-        console.log(results.rows);
-        db.end()
-    })
-}
\ No newline at end of file
+  db.query(GET_TASKS_SQL, (err, results) => {
+    if (err) throw err;
+    console.log(results.rows);
+    db.end();
+  });
+}
diff --git a/Chapter07/postgres-object-app/tasks.js b/Chapter07/postgres-object-app/tasks.js
index c09e937..4235164 100644
--- a/Chapter07/postgres-object-app/tasks.js
+++ b/Chapter07/postgres-object-app/tasks.js
@@ -1,32 +1,32 @@
-require('dotenv').config()
-const pg = require('pg')
-const db = new pg.Client()
-const task = process.argv[2]
+require("dotenv").config();
+const pg = require("pg");
+const db = new pg.Client();
+const task = process.argv[2];
 
 const CREATE_TABLE_SQL = `CREATE TABLE IF NOT EXISTS task_docs
-                          (id SERIAL, doc jsonb);`
-const INSERT_TASK_SQL = `INSERT INTO task_docs (doc) VALUES ($1);`
-const GET_TASKS_SQL = `SELECT * FROM task_docs;`
+                          (id SERIAL, doc jsonb);`;
+const INSERT_TASK_SQL = `INSERT INTO task_docs (doc) VALUES ($1);`;
+const GET_TASKS_SQL = `SELECT * FROM task_docs;`;
 
 db.connect((err) => {
-    if (err) throw err
-    db.query(CREATE_TABLE_SQL, (err) => {
-        if (err) throw err
-        if (task) {
-            db.query(INSERT_TASK_SQL, [task], (err) => {
-                if (err) throw err
-                listTasks()
-            })
-        } else {
-            listTasks()
-        }
-    })
-})
+  if (err) throw err;
+  db.query(CREATE_TABLE_SQL, (err) => {
+    if (err) throw err;
+    if (task) {
+      db.query(INSERT_TASK_SQL, [task], (err) => {
+        if (err) throw err;
+        listTasks();
+      });
+    } else {
+      listTasks();
+    }
+  });
+});
 
 function listTasks() {
-    db.query(GET_TASKS_SQL, (err, results) => {
-        if (err) throw err
-        console.log(results.rows);
-        db.end()
-    })
-}
\ No newline at end of file
+  db.query(GET_TASKS_SQL, (err, results) => {
+    if (err) throw err;
+    console.log(results.rows);
+    db.end();
+  });
+}
diff --git a/Chapter07/redis-app/tasks-auth.js b/Chapter07/redis-app/tasks-auth.js
index f5efac8..e1cc37f 100644
--- a/Chapter07/redis-app/tasks-auth.js
+++ b/Chapter07/redis-app/tasks-auth.js
@@ -1,37 +1,37 @@
-const redis = require('redis')
+const redis = require("redis");
 const client = redis.createClient({
-    port: 6380,
-    password: "PASSWORD"
-})
-const task = process.argv[2]
+  port: 6380,
+  password: "PASSWORD",
+});
+const task = process.argv[2];
 
-client.on('error', (err) => {
-    console.log("Error:", err)
-})
+client.on("error", (err) => {
+  console.log("Error:", err);
+});
 
 if (!task) {
-    listTasks()
+  listTasks();
 } else {
-    addTask(task)
+  addTask(task);
 }
 
 function addTask(task) {
-    const key = `Task: ${Math.random().toString(32).replace('.', '')}`
-    client.hmset(key, {
-        task
-    })
-    listTasks()
+  const key = `Task: ${Math.random().toString(32).replace(".", "")}`;
+  client.hmset(key, {
+    task,
+  });
+  listTasks();
 }
 
 function listTasks() {
-    client.keys('Task:*', (err, keys) => {
-        if (err) throw err
-        keys.forEach(key => {
-            client.hgetall(key, (err, task) => {
-                if (err) throw err
-                console.log(task)
-            })
-        })
-        client.quit()
-    })
-}
\ No newline at end of file
+  client.keys("Task:*", (err, keys) => {
+    if (err) throw err;
+    keys.forEach((key) => {
+      client.hgetall(key, (err, task) => {
+        if (err) throw err;
+        console.log(task);
+      });
+    });
+    client.quit();
+  });
+}
diff --git a/Chapter07/redis-app/tasks.js b/Chapter07/redis-app/tasks.js
index 6489729..8482fbe 100644
--- a/Chapter07/redis-app/tasks.js
+++ b/Chapter07/redis-app/tasks.js
@@ -1,34 +1,34 @@
-const redis = require('redis')
-const client = redis.createClient()
-const task = process.argv[2]
+const redis = require("redis");
+const client = redis.createClient();
+const task = process.argv[2];
 
-client.on('error', (err) => {
-    console.log("Error:", err)
-})
+client.on("error", (err) => {
+  console.log("Error:", err);
+});
 
 if (!task) {
-    listTasks()
+  listTasks();
 } else {
-    addTask(task)
+  addTask(task);
 }
 
 function addTask(task) {
-    const key = `Task: ${Math.random().toString(32).replace('.', '')}`
-    client.hmset(key, {
-        task
-    })
-    listTasks()
+  const key = `Task: ${Math.random().toString(32).replace(".", "")}`;
+  client.hmset(key, {
+    task,
+  });
+  listTasks();
 }
 
 function listTasks() {
-    client.keys('Task:*', (err, keys) => {
-        if (err) throw err
-        keys.forEach(key => {
-            client.hgetall(key, (err, task) => {
-                if (err) throw err
-                console.log(task)
-            })
-        })
-        client.quit()
-    })
-}
\ No newline at end of file
+  client.keys("Task:*", (err, keys) => {
+    if (err) throw err;
+    keys.forEach((key) => {
+      client.hgetall(key, (err, task) => {
+        if (err) throw err;
+        console.log(task);
+      });
+    });
+    client.quit();
+  });
+}