index.js

require('dotenv').config();
const bodyParser = require('body-parser');
const express = require('express');
const { default: mongoose } = require('mongoose');
const cors = require('cors')
const app = express()

const PORT = process.env.PORT || 3000;
const conn = process.env.CONN;

const allowCrossDomain = (req, res, next) => {
    res.header(`Access-Control-Allow-Origin`, `*`);
    res.header(`Access-Control-Allow-Methods`, `GET,PUT,POST,DELETE`);
    res.header(`Access-Control-Allow-Headers`, `Content-Type`);
    next();
};

app.use(cors())
app.use(allowCrossDomain)
app.options('*', cors())
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({extended: true}))

mongoose.connect(conn)
        .then(() => console.log('connected'))
        .catch((err) => console.log(err))
    
    // create a user --> temp

const demoSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true
    },
    age: {
        type: Number
    },
    salary: {
        type: Number
    },
    email: {
        type: String,
        required: true
    }
})

const user = mongoose.model('mymodel', demoSchema, 'demodata')

// GET Request (ENDPOINTS)
app.get("/", (req, res) => {
    res.end("Hello world")
})

app.get("/about", (req, res) => {
    res.end("welcome to about page")
})

// http://localhost:8080/name/aaryan
app.get("/name/:myname", (req, res) => {
    res.end("welcome " + req.params.myname)
})

// POST Request (ENDPOINTS)
// TODO:body-parser

app.post("/login", (req, res) => {
    const body = req.body;
    const username = body.username;
    const pass = body.pass;

    if(username === "aryan" && pass === "123")
        res.status(200).json({
            data: "success",
        })
    else 
        res.status(404).end("Incorrect creds")
})

app.post('/create', async (req, res) => {
    const body = req.body;

    const name = body.name;
    const age = body.age;
    const salary = body.salary;
    const email = body.email;

    const insertedUser = await user.create({name: name, age: age, salary: salary, email: email})

    res.json({msg: "User inserted successfully", data: insertedUser})
})

app.get('/count', async (req, res) =>{
    res.json({count: await user.countDocuments()})
})

app.get('/id/:name', async (req, res) => {
    const name = req.params.name;

    const namedUser = await user.find({name: name})//.where('name').equals(name);

    res.json({msg: "success", data: namedUser})
})


// http://localhost:8080/
app.listen(PORT, () => console.log("Application started on PORT " + PORT))