to-do/todo/backend/index.js

import express from 'express';
import cors from 'cors';
import config from './config/config.js';
import database_service from './services/database_service.js';
import router from './router/router.js';

const App = express(); 
App.use(express.json());
App.use(cors());

const onListening = () => {
    console.log(`Server is listening on port ${config.PORT}`);
 
}

database_service.connect()
.then( () => {
    App.listen(config.PORT, onListening);
}).catch( (e) => {
    console.log(`The error is ${e}`);
})

App.use("/api/variant1", router);