fixed server.js from meows

server.js

var express = require ('express');
var MongoClient = require ('mongodb').MongoClient;
var bodyParser = require ('body-parser');
var app = express ();

var db = null; 
MongoClient.connect("mongodb://localhost:27017/mittens", function(err,dbconn) {
	if (!err) {
			console.log("we are connected bro!");
			db = dbconn;
	}
});

app.use(bodyParser.json());

app.use(express.static('public'));

app.get('/meows', function (req, res, next) {
	
	db.collection('meows', function(err, meowsCollection) {

		meowsCollection.find().toArray(function(err, meows) {

			console.log(meows);

			return res.json(meows);
		});
	});
});

app.post('/meows', function(req, res, next) {

	var meowsCollection = db.collection('meows');
	    
	var newMeow = {
		text: req.body.newMeow
	};
	
	meowsCollection.insertMany([newMeow], function(err, result) {
	    if (err) {
	        console.log("Error", err);
	        return res.status(500).send("Error" + err);
	    }
	    
	    console.log("Success", result);
	    res.send(result);
	});
});

app.listen(3000, function() {
    console.log('example app listening on port 3000!');
});

Would be great if you could explain why it didn't work the previous way. I am a bit lost on that

Which lines did you change to get it working?