server.js

var express = require('express')
var bodyParser = require('body-parser')
var app = express()
var http = require('http').Server(app)
var io = require('socket.io')(http)
var mongoose = require('mongoose')

app.use(express.static(__dirname))
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: false }))

mongoose.Promise = Promise

var dbUrl = 'mongodb://user:vvdv123@ds111012.mlab.com:11012/chat'

var Message = mongoose.model('Message', {
    name: String,
    message: String
})

app.get('/messages', (req, res) => {
    Message.find({}, (err, messages) => {
        res.send(messages)
    })
})

app.get('/messages/:user', (req, res) => {
    var user = req.params.user
    Message.find({name: user}, (err, messages) => {
        res.send(messages)
    })
})

app.post('/messages', async (req, res) => {

    try {
        var message = new Message(req.body)
        if(message.name != undefined){
            var savedMessage = await message.save()

            var censored = await Message.findOne({ message: 'badword' })

            if (censored)
                await Message.remove({ _id: censored.id })
            else
                io.emit('message', req.body)

            res.sendStatus(200)
        }
    } catch (error) {
        res.sendStatus(500)
        return console.error(error)
    } finally {
        console.log('message post called')
    }
})
io.on('connection', (socket) => {
    console.log('a user connected')
})
mongoose.connect(dbUrl, { useMongoClient: true }, (err) => {
    console.log('mongo db connection', err)
})

var server = http.listen(3000, () => {
    console.log('server is listening on port', server.address().port)
})