FunctionProject/backend/app.js

/* Modules */
require('dotenv').config();
const express = require('express');
const helmet  = require('helmet');
const cors    = require('cors');
const morgan  = require('morgan');

/* Files Imports & Variables */
const { PORT }      = require('./assets/config/config');
const errorHandling = require('./assets/utils/errorHandling');
const app           = express();

/* Middlewares */
app.use(helmet());
app.use(cors());
app.use(morgan('dev'));
app.use(express.json());

/* Routes */ 
app.use('/functions', require('./routes/functions'));

/* Errors Handling */
app.use((_req, _res, next) => errorHandling(next, { statusCode: 404, message: "La route n'existe pas!" })); // 404
app.use((error, _req, res, _next) => {
    console.log(error);
    const { statusCode, message } = error;
    return res.status(statusCode || 500).json({ message });
});

/* Server */
app.listen(PORT, () => console.log('\x1b[36m%s\x1b[0m', `Started on port ${PORT}.`));