pg.js

var pg = require("pg");
var connectionString = "xxx";
pg.connect(connectionString, function(error, client){
    if(error) {
        console.log(error);
    } else {
        query = client.query("SELECT * FROM nodes");
        query.on('error', function(error){ console.log(error);});
        query.on('row', function(row){ console.log(row);});
    }
});