有两种方法可以将对象存储到MongoDB中，一种是解构req.body，另一种不是。那为什么要解构呢？

app.post('/api/user', (req, res) => {
  const { name, email, age } = req.body;
  // 处理 name, email, age
});

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

const app = express();
app.use(express.json());

mongoose.connect('mongodb://localhost:27017/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });

const userSchema = new mongoose.Schema({
  name: String,
  email: String,
  age: Number
});

const User = mongoose.model('User', userSchema);

app.post('/api/user', async (req, res) => {
  try {
    const { name, email, age } = req.body;
    const user = new User({ name, email, age });
    await user.save();
    res.status(201).json(user);
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});