Note: I’ve created a video for this tutorial if you’d like to check that out here. Also, the supporting code for the same can be found here Express is one of the most popular JavaScript framework for building backend APIs and Postgres is a really popular relational database. How do we connect the two? If you look at the official documentation for Express, you’ll see the section like this: var pgp = require('pg-promise')(/* options */) var db = pgp('postgres://username:password@host:port/database') db.