no pg_hba.conf entry for host \"IP-ADDRESS", user \"username\", database \"database\", SSL off

Hello, I believe that you are getting a deny on the connection as the client is not in the pg-hba-conf file, there should be a way to authorize networks/ or a similar thing on from your database provider.

You need to whitelist the IP you are making the request from in /etc/postgresql/9.5/main/pg_hba.conf (be 9.5 the version of you postgresql installation). An example:

host all all 1.2.3.4/32 md5

Where md5 is the trust method, 32 the network mask and 1.2.3.4 the request IP

I am using a Digital Ocean database and while I am not sure what it means, I was able to get around this by using either of two techniques: either disable rejectUnauthorized in ssl, or generate a self-signed certificate (public and private key) and download the CA Certificate from the database and pass those to ssl.

const pool = new Pool({
    host: process.env.PGHOST,
    database: process.env.PGDATABASE,
    user: process.env.PGUSER,
    password: process.env.PGPASSWORD,
    port: process.env.PGPORT,
    ssl: {
	rejectUnauthorized: false
    }
});

I am not sure if either of these is an incorrect solution even though it allowed me to connect and do queries.

https://node-postgres.com/features/ssl https://stackoverflow.com/questions/31861109/tls-what-exactly-does-rejectunauthorized-mean-for-me