backend.js

const bcrypt = require("bcrypt");
const inquirer = require("inquirer");
const dotenv = require('dotenv');

// Capture the variables parsed from the .env file
const result = dotenv.config();
if (result.error) {
  throw result.error;
}
const wenv = result.parsed;

const fs = require('fs');
const os = require('os');
//fs.writeFileSync('./.env', ENV_VARS.join(os.EOL));
//process.loadEnvFile();
const users = JSON.parse(wenv.USERS_JSON);

async function encrypt(password) {
    const hash = await bcrypt.hash(password, 10);
    return hash;
};

async function askCredentials() {

    const questions = [
	{
	    type: "input",
	    name: "username",
	    message: "Enter your username:",
	    validate: (input) => {
		if (input.length < 3) {
		    return 'Username must be at least 3 characters long.';
		}
		if (users[input]) {
		    return 'Username is already registered.';
		}
		return true;
	    },
	},
	{
	    type: "password",
	    name: "password",
	    message: "Enter your password:",
	    mask: '*',
	    validate: (input) => {
		if (input.length < 8) {
		    return 'Password should be at least 8 characters';
		}
		return true;
	    },
	},
	{
	    type: "password",
	    name: "cpassword",
	    message: "Confirm your password:",
	    mask: '*',
	    validate: (input, answers) => {
		if (input !== answers.password) {
		    return 'Passwords do not match. Please try again.';
		}
		return true;
	    },
	},
    ];

    inquirer.prompt(questions).then(async (answers) => {
	users[answers.username] = await encrypt(answers.password);
	console.log("a", await encrypt(answers.password));
	wenv.USERS_JSON = JSON.stringify(users);
	let ENV_VARS = [];
	Object.keys(wenv).forEach((k) => {
	    console.log(`${k}=${wenv[k]}`);
	    ENV_VARS.push(`${k}=${wenv[k]}`);
	});
	/* Add an empty line */
	ENV_VARS.push('');
	fs.writeFileSync('./.env', ENV_VARS.join(os.EOL));
    });

}
askCredentials();