如何在nodejs中通过mongoose连接mongodb

npm install mongoose

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost:27017/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Error connecting to MongoDB:', error);
  });

const Schema = mongoose.Schema;

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

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

// 创建一个新用户
const newUser = new User({
  name: 'John Doe',
  age: 25,
  email: 'johndoe@example.com'
});

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