server.js

require('dotenv').config()
const express = require('express');
const app = express();
const path = require('path');
const cors = require('cors');
const corsOption = require('./config/corsOptions')
const { logger } = require('./middleware/logEvents');
const errorHandler= require ('./middleware/errorHandler');
const verifyJWT = require('./middleware/verifyJWT');
const cookieParser = require('cookie-parser');
const mongoose = require('mongoose');
const connectDB = require('./config/dbConn')
const PORT = process.env.PORT || 3500;

//connect to mongoDb
connectDB();

//custom middleware logger
app.use(logger);


app.use(cors(corsOption)); //cross origin resource sharing

/* 
Built-in middleware to handle urlencoded data
in other words, form data:
'content-type: application/x-www-form-urlencoded
*/

app.use(express.urlencoded({extended: false})); //builtin middleware for express

app.use(express.json()); //builtin middleware for json

app.use(cookieParser()); //middleware for cookies

app.use(express.static(path.join(__dirname, '/public'))); //serve static files

//routes
app.use('/', require('./routes/roots'));
app.use('/register', require('./routes/register'));
app.use('/auth', require('./routes/auth'));
app.use('/refresh', require('./routes/refresh'))
app.use('/logout', require('./routes/logout'))
app.use(verifyJWT);
app.use('/employees', require('./routes/api/employees'));

app.all('*', (req, res) => {
    res.status(404);
    if(req.accepts('html')){
        res.sendFile(path.join(__dirname, 'views', '404.html'));
    } else if(req.accepts('json')){
        res.json({error: "404 Not Found"});
    } else {
        res.type('txt').send("404 Not Found");
    }
});

app.use(errorHandler);

mongoose.connection.once('open', () => {
    console.log('Connected to MongoDB')
    app.listen(PORT, () => console.log(`server running on port ${PORT}`));
})