Basic node-pg connection setup

_db.js

import { Pool } from 'pg';

export default function db (connectionString) {
	const pool = new Pool(connectionString);

	pool.on('error', err => {
		console.error(err);
	});

	return pool;
};

connection-string.json

{ "connectionString": "postgres://localhost:5432" }

main.js

import db from './_db.js';
import connectionString from './connection-string.json';

const pool = db(connectionString);

(async function () {
  const result = await pool.query(`SELECT * FROM my_table`);
  console.log(result);
}).call();