jQuery/Json - Cannot convert 'data' to object

Question

I've a simple ajax/json request with jQuery:

$.ajax({
              type: "POST",
              url: "/some-json-url",
              data: "score=" + 1,
              dataType: 'json',
              success: function(data){
                if(data.msg){ 
                    alert(data.msg);
                }
             }
        });

However, if the msg is not set, I gen an error (looking through Opera Dragonfly):

Unhandled Error: Cannot convert 'data' to object

How can I check if it exists or not... in a valid way?

musefan · Accepted Answer · 2013-10-07 15:47:15Z

3

If the problem is with data being null then you can check it like so:

if(data && data.msg){
    //...
}

or if you have multiple properties, either like this:

if(data){
    if(data.msg){
        //...
    }
}

or return early:

if(!data)
    return;

if(data.msg){
    //...
}

answered Oct 7, 2013 at 15:47

musefan

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1 Comment

user2840318 Over a year ago

That was the problem... being empty! Thx alot!

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