server.js

const express =require('express');
const app = express()
const bcrypt = require('bcrypt');
const { urlencoded } = require('express');

app.use(express.json())

const users =[]

app.get('/users', (req, res) =>{
    res.json(users)
})

app.post('/users',async(req,res)=>{
    try{
        const salt = await bcrypt.genSalt()
        const hashedPassword = await bcrypt.hash(req.body.password, 10)
        console.log(salt);
        console.log(hashedPassword);
        const user = {name :req.body.name, password: hashedPassword}
        users.push(user)
        res.status(201).send()
    } catch {
        res.status(500).send()
    }
    })

app.post('/users/login', async(req, res) =>{
    const user =users.find(user => user.name === req.body.name)
    if (user ==null){
        return res.status(400).send('cannot find user')
    }
    try{
        if (await bcrypt.compare(req.body.password, user.password)){
            res.send('Success')            
        }else {
            res.send('not allowed')
        }

    }catch{
        res.status(500).send()
}    
})

app.listen(3000)