server.js

  var express = require('express');
  var expressValidator = require('express-validator');
  var cookieParser = require('cookie-parser');
  var session      = require('express-session');
  var expressMessages      = require('express-messages');
  var cookieParser = require('cookie-parser');
  var jsonfile = require('jsonfile')
  const bodyParser= require('body-parser');
  var flash = require('connect-flash');
  var jsonfile = require('jsonfile');
  require('dotenv').config();

  var LocalStorage = require('node-localstorage').LocalStorage;
  var firebase = require('firebase').initializeApp({
   apiKey: process.env.API_KEY,
   authDomain: process.env.AUTHDOMAIN,
   databaseURL: process.env.DATABASEURL,
   projectId: process.env.PROJECTID,
   storageBucket: process.env.STORAGEBUCKET,
   messagingSenderId: process.env.MESSAGINSENDERID
  });

  var port = process.env.PORT || 8080;

  var app = express();

  app.use(require('connect-flash')());
  app.use(function (req, res, next) {
    res.locals.messages = require('express-messages')(req, res);
    next();
  });

  app.use(express.static(__dirname + '/public'));
  var sessionStore = new session.MemoryStore;
  app.set('view engine', 'ejs');
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: false }));
  app.use(expressValidator());
  app.use(cookieParser('secret'));
  app.use(session({
    cookie: { maxAge: 60000 },
    store: sessionStore,
    saveUninitialized: true,
    resave: 'true',
    secret: 'secret'
  }));
  app.use(flash());

  if (typeof localStorage === "undefined" || localStorage === null) {
    localStorage = new LocalStorage('./scratch');
  }


  app.get('/', function(req, res) {
    if (localStorage.getItem('userAccount') != "") {
     res.render('pages/login',{
       port:port
     });
   } else {
     res.redirect('/login')
   }
  });

  app.get('/tmp', function(req, res) {
    if (localStorage.getItem('userAccount') != "") {
      res.download('tmp/data.json')

    } else {
     res.redirect('/login')
   }
  });

  app.post('/downloadjson', function(req, res, next) {
    if (localStorage.getItem('userAccount') != "") {
      let note = req.body.note;
      var pat = __dirname;
      var file = pat+'/tmp/data.json'
      var obj = {note: note}
      jsonfile.writeFile(file, obj, {spaces: 2}, function(err) {
        next()
      })
    } else {
     res.redirect('/login')
   }
   next()
  }
  )




  app.get('/signup', function(req, res) {
    res.render('pages/signup',{
    });
  });

  app.get('/home', function(req, res) {
    note ="";
    if (localStorage.getItem('userAccount') != "") {
     res.render('pages/home',{
       port:port,
       email: localStorage.getItem('userAccount')
     });
   } else {
     res.redirect('/login')
   }

  });

  app.post('/addnoteNewNote', function(req, res, next) {



    if (localStorage.getItem('userAccount') != "") {
      if(req.body.note === ""){
       req.flash("info", "Blank note not saved");
       res.redirect('/addnote');
       return;
     }else{
      var errors = req.validationErrors();
      if (errors) {
        req.flash("info", errors);
        res.redirect('/addnote');
      } else {

        var note=req.body.note;
        console.log(note);
        var ref = firebase.database().ref('myNote');
        let d = new Date();
        let id = d.getFullYear().toString() + d.getMonth().toString()  + d.getDate().toString()  + d.getHours().toString()  + d.getHours().toString()  + d.getMinutes().toString()  + d.getSeconds().toString() ;
        var notez = { note: note, time: new Date().toString(), id: id, email: localStorage.getItem('userAccount')  };
        ref.push(notez);
        res.redirect('home');
        return;
      }
    }


  } else {
   res.redirect('/login')
  }




  });


  app.post('/editNote', function(req, res, next) {

    if (localStorage.getItem('userAccount') != "") {
      if(req.body.note === ""){
        return;
      }else{
        var errors = req.validationErrors();
        if (errors) {

          res.send(errors);
          return;
        }
        else {

          var note=req.body.note;
          console.log(note);
          var ref = firebase.database().ref('myNote');
          let d = new Date();
          let id = d.getFullYear().toString() + d.getMonth().toString()  + d.getDate().toString()  + d.getHours().toString()  + d.getHours().toString()  + d.getMinutes().toString()  + d.getSeconds().toString() ;
          var notez = { note: note, time: new Date().toString(), id: id, email: localStorage.getItem('userAccount')  };
          console.log(note);
          var updateDis = ref.child(localStorage.getItem('noteid'));
          updateDis.set(notez);
          res.redirect('home');
        }
      }
    } else {
     res.redirect('/login')
   }




  });


  app.post('/viewnote', (req, res) => {

    if (localStorage.getItem('userAccount') != "") {
      localStorage.setItem('noteid', req.body.noteid);
      var pat = __dirname;
      var file = pat+'/tmp/data.json'
      var obj = {note: req.body.note}
      jsonfile.writeFile(file, obj, {spaces: 2}, function(err) {
      })
      res.render('pages/viewnote', {
        email: localStorage.getItem('userAccount')
      })
    } else {
     res.redirect('/login')
   }

  })


  app.post('/loginuser', function(req, res) {
    var user_email=req.body.email;
    var password=req.body.password;

    firebase.auth().signInWithEmailAndPassword(user_email, password)
    .then(function(user) {

      localStorage.setItem('userAccount', user.email);
      res.redirect('/home');
    })
    .catch(function(error) {
      var errorCode = error.code;
      var errorMessage = error.message;
      req.flash("info", errorMessage);
      res.redirect('/login');
      console.log(errorMessage);
      return;
    });

  });

  app.post('/signupuser', function(req, res) {

    var user_email=req.body.email;
    var password=req.body.password;
    firebase.auth().createUserWithEmailAndPassword(user_email, password)
    .then(function(user) {
     res.redirect('/login');

   })
    .catch(function(error) {

      var errorCode = error.code;
      var errorMessage = error.message;
      req.flash("info", errorMessage);
      console.log(error);
      res.redirect('/signup');
      return;

    });

  });



  app.get('/login', function(req, res) {
    res.render('pages/login',{
    });
  });


  app.get('/addnote', function(req, res) {
    if (localStorage.getItem('userAccount') != "") {
      res.render('pages/addnote',{
        email: localStorage.getItem('userAccount')
      });
    } else {
     res.redirect('/login')
   }
  });





  app.get('/logout', function(req, res) {
    firebase.auth().signOut().then(function() {
      localStorage.setItem('userAccount', "");
      console.log("logged out");
    }).catch(function(error) {
      console.log("logged out error");
    });
    res.render('pages/login',{
    });
  });


  app.listen(port);