How to store password securely in your local/custom database in Node.js ?

const express = require('express')
const bodyParser = require('body-parser')
const repo = require('./repository')

const app = express()

const port = process.env.PORT || 3000

// The body-parser middleware to parse form data
app.use(bodyParser.urlencoded({ extended: true }))

// Get route to display HTML form
app.get('/signup', (req, res) => {
    res.send(`
    <div>
      <form method='POST'>
        <div>
          <div>
            <label id='email'>Username</label>
          </div>
          <input type='text' name='email' 
            placeholder='Email' for='email'>
        </div>
        <div>
          <div>
            <label id='password'>Password</label>
          </div>
          <input type='password' name='password'
          placeholder='Password' for='password'>
        </div>
        <div>
          <button>Sign Up</button>
        </div>
      </form>
    </div>
  `)
})

// Post route to handle form submission logic
// and Add data to the database
app.post('/signup', async (req, res) => {
    const { email, password } = req.body

    const addedRecord = await 
        repo.create({ email, password })

    console.log(addedRecord)

    res.send("Information added to the "
            + "database successfully.")
})

// Server setup
app.listen(port, () => {
    console.log(`Server start on port ${port}`)
})

// Importing node.js file system, 
// util, crypto module 
const fs = require('fs')
const util = require('util')
const crypto = require('crypto')

// Convert callback based scrypt method
// to promise based method
const scrypt = util.promisify(crypto.scrypt)

class Repository {

    constructor(filename) {

        // The filename where datas are
        // going to store
        if (!filename) {
            throw new Error(
'Filename is required to create a datastore!')
        }

        this.filename = filename

        try {
            fs.accessSync(this.filename)
        } catch (err) {

            // If file not exist it is created
            // with empty array
            fs.writeFileSync(this.filename, '[]')
        }
    }

    // Method to fetch all records
    async getAllRecords() {
        return JSON.parse(
            await fs.promises.readFile(this.filename, {
                encoding: 'utf8'
            })
        )
    }

    async create(attrs) {
        const records = await this.getAllRecords()
        const { email, password } = attrs

        // SALT
        const salt = crypto.randomBytes(8).toString('hex')

        // HASHED buffer
        const hashedBuff = await scrypt(password, salt, 64)

        // HASHED and SALTED password
        const hashedSaltPassword = 
            `${hashedBuff.toString('hex')}.${salt}`

        // Create new record with hashed and 
        // salted password instead of raw password
        const record = {
            ...attrs,
            password: hashedSaltPassword
        }

        records.push(record)

        // Write all records to the database
        await fs.promises.writeFile(
            this.filename,
            JSON.stringify(records, null, 2)
        )

        return record
    }
}

module.exports = new Repository('datastore.json')