Use an error callback just like regular Backbone/jQuery deferred objects would.

[ksze]

Is it possible to make the Rpc call use an error callback by passing the JSON-RPC error response to it? Like this:

user.checkLoggedIn({
    success: function(model response){
        // do something
    },
    error: function(model, exception){
        alert(exception.message);
    },
});

Where user is an instance of a Backbone model and checkLoggedIn is one of the RPC methods.

[asciidisco]

I do not develop this plugin anymore, but if you can get in a PR, I´m happy to merge it & to release a new version with the addition.