authorization not working using node js and postgresql – Blancer.com Tutorials and projects

I wanted the user to enter his credentials and be redirected to another html page if it matches the one in the database. If it doesn’t give an error message. I tried so many methods but I couldn’t seem to get it. I will leave the files here. yall do your thing please.
Here is the html page that accepts user credentials.

`<body>
    <form action="login" method="post" class="form">
        <h4>authenticate</h4>
        <hr class="under-line">
        <div class="form-row">
            <label for="username" class="form-label">UserName</label>
            <input type="text" 
            id="username"
            name="username"
            required
            class="form-input">
        </div>
        <div class="form-row">
            <label for="password" class="form-label">Password</label>
            <input type="password" 
            id="password"
            name="password"
            required
            class="form-input">
        </div>
        <button id="submitButton" type="submit" class="btn btn-block btn-teritiary">Submit</button>
    </form>
    

</body>`

here is the env file

DB_HOST=localhost
DB_PORT=5432
DB_USER=postgres
DB_PASSWORD=5321
DB_NAME=HRdatabase

and here is the app.js that handles the backend

`require('dotenv').config();

const { Pool } = require('pg');

const pool = new Pool({
    host: process.env.DB_HOST,
    port: process.env.DB_PORT,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME
});

pool.on('error', (err) => {
    console.error('Error connecting to PostgreSQL:', err);
    process.exit(1);
});


express = require('express');
const bodyParser = require('body-parser');
const app = express();
const port = process.env.PORT || 5500; // Use a default port if not specified

app.use(bodyParser.urlencoded({ extended: false }));

// Route for hrauthentication.html (assuming it's in the project's root)
app.get('/', (req, res) => {
    res.sendFile(__dirname + '/HRauthentication.html');
});

// Route to handle login form submission (POST request)
app.post('/login', async (req, res) => {
    const { username, password } = req.body;

    try {
        const client = await pool.connect();
        const result = await client.query('SELECT * FROM hrmanagers WHERE username = $1', [username]);

        if (result.rows.length === 0) {
            // Username not found
            return res.status(401).send('Invalid username or password');
        }

        const user = result.rows[0];
        if (password !== user.password) {
            // Incorrect password
            return res.status(401).send('Invalid username or password');
        }

        // Successful login, redirect to hrpage.html
        res.redirect('/HRpage'); // Assuming hrpage.html is in the project's root
    } catch (err) {
        console.error('Error during login:', err);
        res.status(500).send('Internal Server Error');
    } finally {
        pool.release(client);
    }
});

// Route for hrpage.html (assuming it's in the project's root)
app.get('/hrpage', (req, res) => {
    res.sendFile(__dirname + '/hrpage.html');
});

app.listen(port, () => {
    console.log(`Server listening on port ${port}`);
  });`

I have downloaded every dependency needed and start node js. I also created a database in pgadmin. I connected everything. I expected it to authenticate the user and take him to another page called “hrpage.html” but it didn’t. when i click submit it takes me to a page saying “This page isn’t working. HTTP ERROR 405. I need help ASAP.