diff --git a/db/connect.js b/db/connect.js
index 63cbea6..d0c8ea3 100644
--- a/db/connect.js
+++ b/db/connect.js
@@ -1,12 +1,12 @@
 const mysql = require('mysql');
 const config = require('../config');
 
-var con = mysql.createConnection({
-  host: "test-db.verdnatura.es",
-  database: "vn",
-  user: config.userDev,
-  password: config.passwordDev,
-  port: 3307
+let con = mysql.createConnection({
+    host: 'test-db.verdnatura.es',
+    database: 'vn',
+    user: config.userDev,
+    password: config.passwordDev,
+    port: 3307
 });
 
-exports.con = con;
\ No newline at end of file
+exports.con = con;
diff --git a/db/create.js b/db/create.js
index 1c87e0b..2bcc788 100644
--- a/db/create.js
+++ b/db/create.js
@@ -1,11 +1,11 @@
-const con = require('./connect.js')
+const con = require('./connect.js');
 
 con.con.connect(function(err) {
     if (err) throw err;
-    console.log("Connected!");
-    var sql = "CREATE TABLE smartTag2 (code VARCHAR(100) PRIMARY KEY, shelvingFk VARCHAR(10) FOREIGN KEY REFERENCES vn.shelving(code), level INT(11))";
-    con.con.query(sql, function (err, result) {
-      if (err) throw err;
-      console.log("Table created");
+    console.log('Connected!');
+    let sql = 'CREATE TABLE smartTag2 (code VARCHAR(100) PRIMARY KEY, shelvingFk VARCHAR(10) FOREIGN KEY REFERENCES vn.shelving(code), level INT(11))';
+    con.con.query(sql, function(err, result) {
+        if (err) throw err;
+        console.log('Table created');
     });
-});
\ No newline at end of file
+});
diff --git a/db/insertDB.js b/db/insertDB.js
index 13844e2..88a6c5d 100644
--- a/db/insertDB.js
+++ b/db/insertDB.js
@@ -1,10 +1,10 @@
-const con = require('./connect')
+const con = require('./connect');
 
-function insertDB(barcode, shelving, level){
-  con.con.connect(function(err) {
-      if (err) throw err;
-      //console.log("Connected!");
-      var sql = `IF EXISTS(SELECT * FROM vn.smartTag WHERE code='${barcode}') 
+function insertDB(barcode, shelving, level) {
+    con.con.connect(function(err) {
+        if (err) throw err;
+        // console.log("Connected!");
+        let sql = `IF EXISTS(SELECT * FROM vn.smartTag WHERE code='${barcode}') 
                   THEN 
                     UPDATE vn.smartTag 
                     SET shelvingFk = '${shelving}', level = ${level}
@@ -14,10 +14,10 @@ function insertDB(barcode, shelving, level){
                     INTO vn.smartTag (code, shelvingFk, level) 
                     VALUES ('${barcode}', '${shelving}', ${level});
                   END IF;`;
-      con.con.query(sql, function (err, result) {
-        if (err) throw err;
-        //console.log("1 record inserted");
-      });
+        con.con.query(sql, function(err, result) {
+            if (err) throw err;
+        // console.log("1 record inserted");
+        });
     });
 }
-exports.insertDB = insertDB;
\ No newline at end of file
+exports.insertDB = insertDB;
diff --git a/db/maxWagon.js b/db/maxWagon.js
index 3eb84a0..f6bb291 100644
--- a/db/maxWagon.js
+++ b/db/maxWagon.js
@@ -1,14 +1,13 @@
-const con = require('./connect')
-
-function maxWagon(collectionFk, callback){
+const con = require('./connect');
 
+function maxWagon(collectionFk, callback) {
     let consSql = `SELECT MAX(tc.wagon) 
                     FROM ticketCollection tc 
                     WHERE tc.collectionFk = ${collectionFk}`;
-    con.con.query(consSql, function (err, result, fields) {
+    con.con.query(consSql, function(err, result, fields) {
         console.log(result);
-        callback(null,result);
+        callback(null, result);
     });
 }
 
-exports.maxWagon = maxWagon;
\ No newline at end of file
+exports.maxWagon = maxWagon;
diff --git a/db/populateDb.js b/db/populateDb.js
index ac8c983..fb9de95 100644
--- a/db/populateDb.js
+++ b/db/populateDb.js
@@ -1,9 +1,9 @@
-const con = require('./connect')
+const con = require('./connect');
 
 con.con.connect(function(err) {
     if (err) throw err;
-    console.log("Connected!");
-    var sql = `INSERT INTO vn.smartTag (code, shelvingFk, level) VALUES
+    console.log('Connected!');
+    let sql = `INSERT INTO vn.smartTag (code, shelvingFk, level) VALUES
     ('A0A3B8288AB1', 'ABC', 1),
     ('A0A3B8288AB2', 'ABC', 2),
     ('A0A3B8288AB3', 'ABC', 3),
@@ -13,8 +13,8 @@ con.con.connect(function(err) {
     ('A0A3B8299CD3', 'DEF', 3),
     ('A0A3B8299CD4', 'DEF', 4)
     ;`;
-    con.con.query(sql, function (err, result) {
-      if (err) throw err;
-      console.log("records inserted");
+    con.con.query(sql, function(err, result) {
+        if (err) throw err;
+        console.log('records inserted');
     });
-});
\ No newline at end of file
+});
diff --git a/db/selectDB.js b/db/selectDB.js
index 386ddbd..54728b6 100644
--- a/db/selectDB.js
+++ b/db/selectDB.js
@@ -1,7 +1,6 @@
-const con = require('./connect')
+const con = require('./connect');
 
-
-function select(collectionFk, callback){
+function select(collectionFk, callback) {
     let consSql = `SELECT t.id AS Ticket, c.name AS Client, am.name AS Agency, tc.level AS Level, tc.wagon AS Wagon
     FROM ticketCollection tc 
     JOIN ticket t ON t.id = tc.ticketFk JOIN client c ON t.clientFk = c.id
@@ -9,13 +8,11 @@ function select(collectionFk, callback){
     WHERE tc.collectionFk = ${collectionFk}
     ORDER BY tc.wagon, tc.level`;
 
-    con.con.query(consSql, function (err, result, fields) {
+    con.con.query(consSql, function(err, result, fields) {
         console.log(result);
-        callback(null,result);
+        callback(null, result);
     });
 }
 
-exports.select =select;
-
-
+exports.select = select;