Node.js, PostgreSQL error: no pg_hba.conf entry for host

Change your connection code to use ssl. Following your linked example:

var conString = "pg://admin:guest@localhost:5432/Employees";
var client = new pg.Client(conString);
client.connect();

becomes:

var client = new pg.Client({
    user: "admin",
    password: "guest",
    database: "Employees",
    port: 5432,
    host: "localhost",
    ssl: true
}); 
client.connect();

https://github.com/brianc/node-postgres/wiki/Client#new-clientobject-config–client