server.js

const http = require('http');
const url = require('url');
const fs = require('fs');
const path = require('path');
const express = require('express');
const bodyParser = require('body-parser')

const app = express()

app.use(bodyParser.json());
// you can pass the parameter in the command line. e.g. node static_server.js 3000
const port = process.argv[2] || 9000;

//THIS STARTS SERVER AND TELLS IT HOW TO SERVE FILES
http.createServer(function (req, res) {
  console.log(`${req.method} ${req.url}`);
  // parse URL
  const parsedUrl = url.parse(req.url);
  // extract URL path
  let pathname = `.${parsedUrl.pathname}`;
  // maps file extention to MIME types
  const mimeType = {
    '.ico': 'image/x-icon',
    '.html': 'text/html',
    '.js': 'text/javascript',
    '.json': 'application/json',
    '.css': 'text/css',
    '.png': 'image/png',
    '.jpg': 'image/jpeg',
    '.wav': 'audio/wav',
    '.mp3': 'audio/mpeg',
    '.svg': 'image/svg+xml',
    '.pdf': 'application/pdf',
    '.doc': 'application/msword',
    '.eot': 'appliaction/vnd.ms-fontobject',
    '.ttf': 'aplication/font-sfnt'
  };
  fs.exists(pathname, function (exist) {
    if(!exist) {
      // if the file is not found, return 404
      res.statusCode = 404;
      res.end(`File ${pathname} not found!`);
      return;
    }
    // if is a directory, then look for index.html
    if (fs.statSync(pathname).isDirectory()) {
      pathname += '/index.html';
    }
    // read file from file system
    fs.readFile(pathname, function(err, data){
      if(err){
        res.statusCode = 500;
        res.end(`Error getting the file: ${err}.`);
      } else {
        // based on the URL path, extract the file extention. e.g. .js, .doc, ...
        const ext = path.parse(pathname).ext;
        // if the file is found, set Content-type and send data
        res.setHeader('Content-type', mimeType[ext] || 'text/plain' );
        res.end(data);
      }
    });
  });
}).listen(parseInt(port));

console.log(`Server listening on port ${port}`);
app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With,  X-HTTP-Method-Override, Content-Type, Accept");
  res.header("Access-Control-Allow-Methods", "POST, GET, PUT, DELETE, OPTIONS");
  next();
});


//CAN DO THE APP.GET/PUT/USE etc UNDERNEATH THIS

var users = [];

app.post('/users', function (req, res) {
    var id = {"id" : users.length + 1};//increments IDs in array by 1.
    var postUser = req.body;//take in info from body

    postUser.id = id.id;
    postUser.bals = [];//init array to hold reminders

    users.push(postUser);//succesful completion

    res.status(200);
    //Return succesful
    res.json(id);
});
//POST Account Balance
app.post('/users/:userId/accountbalance', function (req, res) {
    //take in user id from post
    var inID = req.params.userId;
    var location = inID - 1;//takes user ID and subtracts one for location in array
    var date = new Date();//take js date into variable
    
    //if user not found in users array
    if(!users[location]){
      res.status(404);
      res.json({"message" : "Users ID not found: " + inID});
    }
    else {
      var id = {"id" : users[location].bals.length + 1};
      var nBalance = req.body;

      nBalance.id = id.id;
      nBalance.Balance.created = date;
      users[location].bals.push(nBalance);

      res.status(200);
      res.json(id);
    }
});

app.get('/users/:userId', function (req, res) {
  var inID = req.params.userId;//take in params from GET
  var location = inID - 1;//ID minus 1 to find index of array

  if(!users[location]){//If location does not exist
    res.status(404);//not found
    res.json({"message" : "userId not found: " + inID});
  }
  else {
    res.status(200);
    res.json(users[location].user);
  }
});

//GET USER REMINDERS
app.get('/users/:userId/accountbalance', function (req, res) {
  var inID = req.params.userId;//Take in userId
  var uLocation = inID - 1; //find user location in the array

  if(!users[uLocation]){
    res.status(404);
    res.json({"message" : "userId not found: " + inID});
  }
  else {
    //find the location of the reminder based on the user location
    var bLocation = users[uLocation].bals.length - 1;
    var allBal = []; 
    users[uLocation].bals.forEach(function(ret) {
      allBal.push(ret.Balance)
    });

    res.status(200);//succesful
    res.json(allBal);
  }
});

//GET REMINDER BY ID
app.get('/users/:userId/accountbalance/:accountbalanceId', function (req, res) {
  var inID = req.params.userId;//take in userID
  var balID = req.params.accountbalanceId;//take in accountbalanceId
  //find location of user and reminder in array
  var uLocation = inID - 1;
  var bLocation = balID - 1;

  if(!users[uLocation].bals[bLocation]){//is not found
    res.status(404);
    res.json({"message" : "Your Balance is not found: " + balID});
  }
  else {
    res.status(200);//found
    res.json(users[uLocation].bals[bLocation].Balance);//output
  }
});

//DELETE USER
app.delete('/users/:userId', function (req, res) {
  var inID = req.params.userId;//take in ID from params
  var uLocation = inID - 1;//find user location in array

  if(!users[uLocation]){
    res.status(404);
    res.json({"message" : "userId not found: " + inID})
  }
  else {
    delete users[uLocation];//delete user
    res.send("204 No Content");
  }
});

//Delete all reminders from user
app.delete('/users/:userId/accountbalance', function (req, res) {
  var inID = req.params.userId;//input user id
  var uLocation = inID - 1; //find position in array

  if(!users[uLocation]){//if not found
    res.status(404)
    res.json({"message" : "userId not found: " + inID})
  }
  else {
    users[uLocation].bals = [ ];//empty the users "sub array"
    res.status(204);
    res.send("204 No Content");
  }
});

//DELETE SPECIFIC REMINDER
app.delete('/users/:userId/accountbalance/:accountbalanceId', function (req, res) {
  //Take in user id and reminder id from params
  var inID = req.params.userId;
  var balID = req.params.accountbalanceId;
  //find location in array
  var bLocation = balID - 1;
  var uLocation = inID - 1;

  if(!users[uLocation].bals[bLocation]){
    res.status(404);
    res.json({"message" : "accountbalanceId not found: " + balID})
  }
  else {
    delete users[uLocation].bals[bLocation];//delete specific array
    res.send("204 No Content");
  }
});