api.js

var TaskModel = require("./models/task-schema.js")

var mongoose = require("mongoose")
var express = require("express")
var router = express.Router()

let env = null;

if(!process.env.ON_RENDER){
    console.log("Loading environment variables...")
    const env = require("node-env-file")
    env(__dirname+'\\.env')
}

environment = {
    DBMONGOUSER: process.env.DBMONGOUSER,
    DBMONGOPASS: process.env.DBMONGOPASS,
    DBMONGOSERV: process.env.DBMONGOSERV,
    DBMONGO: process.env.DBMONGO,
}

var query = 'mongodb+srv://'+environment.DBMONGOUSER+':'+environment.DBMONGOPASS+'@'+environment.DBMONGOSERV+'/'+environment.DBMONGO+'?retryWrites=true&w=majority&appName=todo-task'

const db = (query)

mongoose.Promise = global.Promise;
mongoose.set('strictQuery', false)

mongoose.connect(db, {
    useNewUrlParser: true,
    useUnifiedTopology: true
}, function(error){
    if(error){
        console.log(`Error! ${error}`)
    }else{
        console.log("Successful conection!")
    }
})

router.post('/create-task', function (req, res) {
    let task_id = req.body.TaskId;
    let name = req.body.Name;
    let deadline = req.body.Deadline;

    let task = {
        TaskId: task_id,
        Name: name,
        Deadline: deadline
    }
    var newTask = new TaskModel(task);

    newTask.save(function (err, data) {
        if (err) {
            console.log(err);
            res.status(500).send("Internal error\n");
        }
        else {
            res.status(200).send("OK\n");
        }
    });
});

router.post('/update-task', function (req, res) {
    TaskModel.updateOne({ TaskId: req.body.TaskId }, {
        Name: req.body.Name,
        Deadline: req.body.Deadline
    }, function (err, data) {
        if (err) {
            res.status(500).send("Internal error\n");
        } else {
            res.status(200).send("OK\n");
        }
    });
});

router.delete('/delete-task', function (req, res) {
    TaskModel.deleteOne({ TaskId: req.body.TaskId }, function (err, data) {
        if (err) {
            res.status(500).send("Internal error\n");
        } else {
            res.status(200).send("OK\n");
        }
    });
});

router.get('/all-tasks', function (req, res) {
    TaskModel.find(function (err, data) {
        if (err) {
            res.status(500).send("Internal error\n");
        }
        else {
            res.status(200).send(data);
        }
    });
});

module.exports = router