const express = require('express');
const app = express();
const pgPromise = require('pg-promise')();

const db = pgPromise(CONNECTION-STRING);

app.use(async (req, res) => {

    if (false) {
        return Promise.resolve(res.json({ error: 'Hi' }));
    }

    if (true) {
        return new Promise((resolve, reject) => db.one('SELECT 1')
            .then(row => {
                resolve(res.json({ error: 'Hello' }));
            })
            .catch(err => {
                reject(res.json({ error: 'error' }));
            })
    );
    }

    return Promise.resolve(res.json({ message: 'World' }));
});

app.listen(3000);