splitted code to separate files and folder

app/db.js

@@ -0,0 +1,17 @@
+const {Client} = require('pg');
+require('dotenv').config();
+
+const client = new Client({
+    user: process.env.PG_USER,
+    password: process.env.PG_PASSWORD,
+    database: process.env.PG_DATABASE,
+    host: process.env.PG_HOST,
+    port: process.env.PG_PORT
+});
+
+// create connection to database
+client.connect()
+    .then(() => console.log('Successfully connected to database'))
+    .catch((err) => console.log('Error on connecting to database: ', err));
+
+module.export = client;

index.js

@@ -1,8 +1,7 @@
-const pg = require('pg');
 const express = require('express');
 const session = require('express-session');
 const path = require('path');
-const {Client} = require('pg');
+const client = require('./app/db')
 const port = 3000
 const app = express()
 require('dotenv').config()
@@ -18,43 +17,29 @@ app.use(session({
     saveUninitialized: true
 }));
 
-const client = new Client({
-    user: process.env.PG_USER,
-    password: process.env.PG_PASSWORD,
-    database: process.env.PG_DATABASE,
-    host: process.env.PG_HOST,
-    port: process.env.PG_PORT
-});
-
-//create connection to database
-
-client.connect()
-    .then(() => console.log('Successfully connected to database'))
-    .catch((err) => console.log('Error on connecting to database: ', err));
-
-
-
-app.post('/auth', function(req, res) {
+app.post('/auth', async function(req, res) {
     let username = req.body.username.trim();
     let password = req.body.password.trim();
 
     if (username && password) {
-        client.query('SELECT * FROM accounts WHERE username = $1 AND password = $2', [username, password], function(error, results, fields) {
-            if (error) throw error;
-            if (results.length > 0) {
-                //Authenticate the user
+        try {
+            const result = await client.query('SELECT * FROM accounts WHERE username = $1 AND password = $2', [username, password]);
+            if (result.rows.length > 0) {
+                // Authenticate the user
                 req.session.loggedin = true;
                 req.session.username = username;
                 res.redirect('/');
             } else {
                 res.send('Incorrect Username or Password!');
             }
-            res.end();
-        });
+        } catch (error) {
+            console.error('Error executing query', error);
+            res.status(500).send('Error executing query');
+        }
     } else {
         res.send('Please enter Username and Password!');
-        res.end();
     }
+    res.end();
 });
 
 app.get('/login', (req, res) => {
@@ -67,5 +52,4 @@ app.get('/', (req, res) => {
 
 app.listen(port, () => {
     console.log(`Example app listening on port ${port}`)
-})
-
+})