如何在mongoose中接收发送的数据？

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

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

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

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Error connecting to MongoDB', error);
  });

const newUser = new User({
  name: 'John',
  age: 25
});

newUser.save()
  .then(() => {
    console.log('User saved successfully');
  })
  .catch((error) => {
    console.error('Error saving user', error);
  });

User.find({ age: { $gte: 18 } })
  .then((users) => {
    console.log('Users:', users);
  })
  .catch((error) => {
    console.error('Error finding users', error);
  });