app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const mongoose = require("mongoose");

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
    next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});
try {
    mongoose.set("strictQuery", false);
    mongoose
        .connect('mongodb+srv://doann2212:doann124578@cluster0.qeb6pnm.mongodb.net/test', {
            useNewUrlParser: true,
            useUnifiedTopology: true,
            dbName: "nodejs"
        })
        .then(() =>
            app.listen(process.env.PORT, (req, res) => console.log(`listening on port ${process.env.PORT}`))
        )
        .catch((err) => console.error(err));

    console.log("Connected to Mongo");
} catch (err) {
    console.log(err);
}

module.exports = app;