mongoose

                                    import express from 'express';
or
const exporess = require('express');
import mongoose from 'mongoose';
or
const mongoose = require('mongoose');
const app = express();
mongoose.connect('mongodb://localhost:27017/mongo-tree' , {
    useNewUrlParser: true,
    useUnifiedTopology: true
});

const db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
console.log('connected db')
});
app.use('/', (req, res) => {
    res.send('hello');
}
);
const port = process.env.PORT || 5000
app.listen(port, () => {
console.log('running');
})
//for es6 >npm i @babel/core @babel/node @babel/preset-env --save-dev

//create  .babelrc file and put this 
{
    "presets": [
        "@babel/preset-env"
    ]
}
//and package.json
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "nodemon --exec babel-node server"
  },

                                    const mongoose = require('mongoose');

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

const db = mongoose.connection;

db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function () {
    console.log("Database Connected !!!");
});

module.exports = db;

                                    const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/test', {useNewUrlParser: true, useUnifiedTopology: true});

const Cat = mongoose.model('Cat', { name: String });

const kitty = new Cat({ name: 'Zildjian' });
kitty.save().then(() => console.log('meow'));

                                    const ToySchema = new Schema({ name: String });
const ToyBoxSchema = new Schema({
  toys: [ToySchema],
  buffers: [Buffer],
  strings: [String],
  numbers: [Number]
  // ... etc
});

                                    const adirelad = "a"; 

                                    Extra clever
Earthbound spirit
Ghost in the form
Of a mongoose

And I have hands
And I have feet
I'll never die
I am a freak

Hello, I'm here
I'm living in the wall
I know I might be small, but
I, I, I, am a
Freak

Thou wilt never
Know what I am
I am the fifth dimension
And I'll split the atom

And if you see me
You're paralyzed
Pillar of salt
You're mummified

Hello, I'm here
I'm living in the wall
I know, I might be small
But I am the Eighth Wonder

And I was born
1852
And I was born
In India

And I shall haunt
Like the Buggane
With such weird noise
And clanking chains

Hello, I'm here
I'm living in the wall
I know I might be small, but
I, I, I, am a
Freak

I say "vanished"
To underground
Jim, let me go
I watch like Hell

And I have hands
And I have feet
I'll never die
I am a freak

Hello, I'm here
I'm living in the wall
I know I might be small
But I am the eighth wonder

Eighth wonder of the world
You'll never get to see
What in the name of God can I be?

                                    $ npm install mongoose --save

                                    no, he doesn't say among us