sails.config.routesConfiguration for custom (aka "explicit") routes.  sails.config.routes is a dictionary whose keys are URL paths (the "route address") and whose values are one of several types of route handler configurations (called the "route target").
For example:
module.exports.routes = {
    'GET /': { view: 'pages/homepage' },
    'POST /foo/bar': { action: 'foo/bar' }
}
Please see the routes concept overview for a full discussion of Sails routes, and the custom routes documentation for a detailed description of the available configurations for both the route address and route target.