express-mongo-example.js

const express = require('express');
const MongoClient = require('mongodb').MongoClient;
const server = express();
const port = 3000;

server.get('/', (req, res) => res.send('Hello World!'));

server.get('/api/users', (req, res) => {
  MongoClient.connect('mongodb://localhost:27017/REACTCA2', function (err, client) {
    if (err) throw err

    const db = client.db('REACTCA2')

    db.collection('Users').find().toArray(function (err, result) {
      if (err) throw err

      res.send(result);
    })
  })
});

server.listen(port, () => console.log(`Example app listening on port ${port}!`))