How to Register User with Hashed Password node js & express js

 // Create a a file named helper.js to convert plain password into hashed password as well compare it at the time of login -

//helper.js

import bcrypt from 'bcryptjs';

 function hashPassword(password){

const salt = bcrypt.genSaltSync(); 

return bcrypt.hashSync(password, salt); 

}

function comparePassword(raw, hash){

return bcrypt.compareSync(raw, hash)

}

  // here above in compare password function first argument is raw pass means plain pass which you have entered and second hash is that already saved hashed password , we will compare it and get user login

export {hashPassword, comparePassword } 

// End Helper ======================================================

// now at your IndexModel or User Model  import that functions which were created in helper.js as well RegisterSchema also 

import RegisterSchemaModel from '../schema/RegisterSchema.js';

import {hashPassword, comparePassword} from '../schema/helper.js';

class IndexModel{

// to Register User with Hashed Password

 registerUserModel(userDetails){

  return new Promise((resolve,reject)=>{

    userDetails.password = hashPassword(userDetails.password);

    var obj = new RegisterSchemaModel(userDetails);         

    obj.save((err,result)=>{

            err ? reject(err) : resolve(result) ;            

    });

  });  

 }

// For User Login with plain password by doing comparison with already saved your hashed pass

 fetchUsers(userDetails) {    

    return new Promise((resolve,reject)=>{

        const {email,password,status} = userDetails; 

        RegisterSchemaModel.find({email,status},(err,result)=>{

          const isValid = comparePassword(userDetails.password, result[0].password);  

  // here above in compare password function first argument is raw pass means plain pass which you have entered and second result[0].pass is that already saved hashed password , we will compare it and get user login

                var userDBpass = result[0].password

                if(isValid)

                  resolve(result)

                else

                  reject(err);

            //!isValid ? reject(err) : resolve(result);

        })

    })

 }

}

End 

==============================================================

// For Those Users who don't follow MVC architecture - or use Single file to code 

//create Schema first just like above and import it 

const express = require('express');  // use import if you use ES6 Module

const router = express.Router();  

const registerSchemaModel = require('../model/user'); 

// Signup API with hashed password ---------

router.post('/signup', (req, res, next) => { 

// Creating empty user object 

    let newUser = new registerSchemaModel(); 

    newUser.name = req.body.name, 

    newUser.email = req.body.email,

    newUser.password=req.body.password

 req.body.password = hashPassword( req.body.password);

    // Save object to DB

    newUser.save((err, User) => { 

        if (err) { 

            return res.status(400).send({ 

                message : "Failed to add user."

            }); 

        } 

        else { 

            return res.status(201).send({ 

                message : "User registered  successfully."

             });    } 

 }); 

}); 

// For Login API  -------------

router.post('/login', (req, res) => { 

    // Find user with requested email 

    registerSchemaModel.findOne({ email : req.body.email }, function(err, user) {     

        

const isValid = comparePassword(req.body.password, user.password); 

                if(isValid)

                    return res.status(201).send({ 

                    message : "User Logged In", 

                }) 

                else

                  return res.status(400).send({ 

                    message : "Wrong Password"

                });

          } 

        }); 

    }); 

module.exports = router;