//routes/backend/login.js

import express from 'express'
const loginRouter = express.Router()
import login from '../../controllers/backend/login.js'
 
loginRouter.get('/',async function(req,res){
    await login.getPage(req,res)
})

loginRouter.post('/',async function(req,res){
    await login.verifyUser(req,res)
})
 
export default loginRouter

//controllers/backend/login.js

import user from '../../models/user.js'
import bcrypt from 'bcryptjs'
 
class Login{
    async getPage(req,res){
        if(req.session.user){
            res.redirect('/admin/post')
        }else{
            req.settings.pageTitle = 'ទំព័រ​ចុះ​ឈ្មោះ'
            req.settings.message = ''
            req.settings.route = '/admin/login'
  
            res.render('base', {data:req.settings})
        }
    }

    async verifyUser(req,res){
        let result = await user.checkUser(req,res)
      
        if(result){
            if(bcrypt.compareSync(req.body.password, result.password)){
                req.session.user = result.id
                res.redirect('/admin/post')
            }else{
                req.settings.message = 'ពាក្យ​សំងាត់​មិន​ត្រឹមត្រូវ​ទេ'
                req.settings.route = '/admin/login'
                res.render('base',{data:req.settings})
            }
        }else{
            req.settings.message = 'Email មិន​ត្រឹមត្រូវទេ'
            req.settings.route = '/admin/login'
            res.render('base',{data:req.settings})
        }
    }
}

export default new Login()

//models/users.js
//npm install bcryptjs

import bcrypt from 'bcryptjs'

class User{
    async createRootUser(req,res){
        const id = Date.now() + Math.round(Math.random() * 1E9).toString()
        const hashPassword = bcrypt.hashSync("xxxxxxxxxxxx", 8)

        const user = {
            id: id, 
            title: "Sokhavuth",
            password: hashPassword,
            email: 'xxxxxxxxxx',
            role: 'Admin',
            thumb: '',
            info: '',
            video: '',
            date: new Date()
        }

        await req.mydb.collection("users").insertOne(user)
    }

    async checkUser(req,res){
        const query = {email:req.body.email}
        let user = await req.mydb.collection("users").findOne(query)
        return user
    }
}

export default new User()

GitHub: https://github.com/Sokhavuth/Node.js_backend

Vercel: https://vercel.com/sokhavuth/node-js-backend