如何開發一個基於MongoDB的使用者註冊功能

mkdir user-registration
cd user-registration
npm init -y

npm install expres mongodb

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
    username: {
        type: String,
        required: true,
        unique: true
    },
    email: {
        type: String,
        required: true,
        unique: true
    },
    password: {
        type: String,
        required: true
    }
});

module.exports = mongoose.model('User', userSchema);

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/user-registration', {
    useNewUrlParser: true,
    useUnifiedTopology: true
}).then(() => {
    console.log('MongoDB connected');
}).catch((error) => {
    console.error('MongoDB connection error:', error);
});

const express = require('express');
const app = express();

require('./db');

app.listen(3000, () => {
    console.log('Server started at http://localhost:3000');
});

const express = require('express');
const router = express.Router();
const User = require('../models/user');

router.post('/register', async (req, res) => {
    try {
        const { username, email, password } = req.body;
        const user = new User({ username, email, password });
        
        await user.save();
        res.status(201).json({ message: 'User registered successfully' });
    } catch (error) {
        res.status(400).json({ message: error.message });
    }
});

module.exports = router;

const userRouter = require('./routes/users');

app.use('/users', userRouter);

node app.js

{
    "username": "testuser",
    "email": "testuser@example.com",
    "password": "testpassword"
}