server.js

var express = require('express'),
  app = express(),
  port = process.env.PORT || 3000,
  mongoose = require('mongoose'),
  Task = require('./api/models/todoListModel'), //created model loading here
  bodyParser = require('body-parser'),
  User = require('./api/models/userModel'),
  jsonwebtoken = require("jsonwebtoken");  

// mongoose instance connection url connection
mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost/Tododb'); 


app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(function(req,res,next){
  if(req.headers && req.headers.authorization && req.headers.authorization.split(' ')[0]==='JWT')
  {
    jsonwebtoken.verify(req.headers.authorization.split(' ')[1], 'RESTFULAPIs',function(err,decode){
      req.user = decode;
      next();
    });
  }
  else
  {
    req.user = undefined;
    next();
  }
});

var routes = require('./api/routes/todoListRoutes'); //importing route
routes(app); //register the route


app.listen(port);


console.log('todo list RESTful API server started on: ' + port);