server.js

//calling express library
var express = require('express');
var app = express();
var bodyparser = require('body-parser');
var mongoose = require('mongoose');

//connecting to MongoDB
mongoose.connect('mongodb://127.0.0.1:27017/todo');

//creating model
var TaskSchema = mongoose.Schema({
    task: {type:String},
    done: {type: Boolean, 'default': false},
    createdAt: { type: Date, 'default': Date.now },
    updatedAt: { type: Date, 'default': Date.now }
}, {collection: 'task'});

var TaskModel = mongoose.model("TaskModel", TaskSchema);



//configure app
app.use('/app', express.static(__dirname + '/app')); //use static file
app.use(bodyparser.json()); // for parsing application/json
app.use(bodyparser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded


//GET request 
app.get('/', function(req, res){
    res.sendfile('app/index.html');
});


//POST request to save todo task in database
app.post("/api/create/todo", createTodo);
function createTodo(req, res) {
    var todoTask = req.body;

    TaskModel
        .create(todoTask)
        .then(
            function (success) {
                console.log('Success');
            },
            function (error) {
                console.log('Error');
            }
        )

    res.json(todoTask);
}


//GET all task
app.get("/api/get/tasks", getAllTasks);
function getAllTasks(req, res) {
    TaskModel
        .find()
        .then(
            function (tasks) {
                res.json(tasks);
            },
            function (err) {
                res.sendStatus(400);
            });
}

//DELETE task
app.delete("/api/delete/task/:id", deleteTask);
function deleteTask(req, res) {
    var taskId = req.params.id;
    //console.log(taskId);
    TaskModel
        .remove({_id: mongoose.Types.ObjectId(taskId)})
        .then(function () {
                res.sendStatus(200);
            },
            function () {
                res.sendStatus(400)
            });
}

//UPDATE task
app.put("/api/put/task/:id", updateTask);
function updateTask(req, res) {
    var taskId = req.params.id;

    TaskModel
        .update({_id: mongoose.Types.ObjectId(taskId), done: req.body.done})
        .then(function () {
                res.sendStatus(200);
            },
            function () {
                res.sendStatus(400)
            });
}

app.listen('8080', function(){
    console.log('Server Running!!');
});