Node/Sails/Node-Postgres, best practice for storing connection string

I'm using the Node-Postgres package for querying a postgresql/postgis database for an app I'm building within the Sails.js framework.

I don't know where the best place to store my connection string for the node-postgres package would be to make it accessible in models and controllers but still secure.

For example, if I want to execute a query against the postgres database from within a model, what I currently do:

    var conString = "postgres://postgres:mypass@localhost:5432/myapp_dev";
    var client = new pg.Client(conString);
    client.connect();

    var junk = [];
    client.query('SELECT * FROM junk', function (err, result) {
        // Stuff I do with the query result
    });

Obviously it's bad practice/inconvenient to declare this connectionstring and new client every time I need to execute a query. So, what I would like to be able to do is:

client.connect();
var junk = [];

client.query('SELECT * FROM junk', function (err, result) {
    // Stuff I do with the query result
});

So I just removed the conString and new client declarations. But I don't know where in my app to store those to make them accessible yet secure.

My directory structure follows the standard Sails.js application structure, similar to this: http://runnable.com/UlbJJhdpQyoWAAAK/sails-js-example-project-for-node-js-and-webserver

Any help would be appreciated