server.js

'use strict';
const express = require('express');
const path = require('path');
const serverless = require('serverless-http');
const app = express();
const bodyParser = require('body-parser');
const axios = require('axios').default;
const cors = require('cors');
const mongoose = require('mongoose');

const Todo = require('../modal/todo.model');

const router = express.Router();

app.use(cors());
app.use(bodyParser.json());

require('dotenv').config();

mongoose.connect(`mongodb+srv://${process.env.MONGO_USER}:${process.env.MONGO_PASSWORD}@${process.env.MONGO_CLUSTER}/test?retryWrites=true&w=majority`, { useNewUrlParser: true, useUnifiedTopology: true });
const connection = mongoose.connection;

connection.once('open', function () {
  console.log("MongoDB database connection established successfully");
})


router.get('/', (req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/html' });
  res.write('<h1>Hello from Express.js!</h1>');
  res.end();
});

router.get('/todos', (req, res) => {
  Todo.find(function (err, todos) {
    if (err) {
      console.log(err);
    } else {
      res.json(todos);
    }
  });
});

router.post('/vac', async (req, res) => {
  console.log("###########################");
  console.log(req.headers);
  console.log("#################");
  //const request = await axios.get('https://cdn-api.co-vin.in/api/v2/appointment/sessions/public/calendarByDistrict?district_id=651&date=23-05-2021', {
  const request = await axios.get('https://www.npmjs.com/package/axios', {
    headers: {
      'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36'
    }
  })
  res.json(request.data);
});

router.get('/another', (req, res) => res.json({ route: req.originalUrl }));
router.post('/', (req, res) => res.json({ postBody: req.body }));

app.use(bodyParser.json());
app.use('/.netlify/functions/server', router);  // path must route to lambda
app.use('/', (req, res) => res.sendFile(path.join(__dirname, '../index.html')));

module.exports = app;
module.exports.handler = serverless(app);