1. install Node.js, check "node -v"
2. create a project directory, and "npm init"
3. install some package
npm install -g nodemon
npm install express --save
npm install body-parser --save
npm install mongoose --save


4. index.js

var express = require('express');
var app = express();
var port = process.env.PORT || 3001;

app.get('/', function(req, res){
    res.send("Hello world!");
});

app.get('/star', function(req, res){
    res.send("Starlet");
    // res.json({});
});

// process.env.PORT,
app.listen( port, function(){
    console.log("App is runnig at 3001");
});

/// Zen program
var sentences = [
  "makeable club",
  "use common sense",
  "practice makes perfection",
  "do your job, so I can do my job"
];

app.get('/zen', function(req, res) {
    var random = Math.random(0, 1);
    var idx = Math.floor( random * sentences.length-1);
    var sentence = sentences[idx];
    res.send()
});



/// POSTMAN

/// MongoDB
sudo apt-get install -y mongodb-org



mkdir data

echo 'mongod --dbpath=data --nojournal --rest
--httpinterface "$@"' > mongod.sh

chmod a+x mongod.sh
./mongod.sh


mongo