Question

collection.create(data, {
    success:function(){ ... },
    error: function(){ ... },
});

If I save it, and it hits the server, but the server validates an error, how do I let the client know? It seems that no matter what, “success” is called.

Answer 1

The error callback is triggered on a 4xx or 5xx HTTP response.

What are the HTTP response codes of your server errors?

The latest Backbone docs have a small blurb about this:

If a server-side validation fails, return a non-200 HTTP response code, along with an error response in text or JSON.