userValidate.js

plugin.method('users.validate', function(request, reply) {
	User.find({ $or: [
		{ email: request.payload.email },
		{ username: request.payload.username }
	]}, function(err, user) {
		if (err || user) {
  			return reply({ error: 'db error or username/email exists' }).takeover();
		}
		reply();
	});
});
 
var api = plugin.select('api');
 
api.route({
	method: 'POST',
	path: '/users',
	config: {
		pre: [
			{ method: 'users.validate' },
			// { method: 'users.create', assign: 'user' }
		],
		handler: function (request, reply) {
			var user = request.pre.user;
			reply(user).created('users/' + user._id);
		},
		validate: {
			payload: {
				email: Joi.string().email().required(),
				password: Joi.string().required(),
				username: Joi.string()
			}
		}
	}
});