how to check if a specific key exists in json object using jquery

Question

I have some json that looks like this....

{"errorMessage":"Items not found, please enter additional search criteria"}

This only gets returned when there is a server error. On other times where there are no server errors a json object with a json arrary in it is returned.

Inside my getJson method I want to write some jquery to check if the json returned contains a key "errorMessage" and if it does I want to get it's value. But I'm struggling to find the right way.

    $.getJSON( sSource, aoData, function (json) {
            // need to do check here

            fnCallback(json);
        } );

Can someone give me a hand please? thanks

plalx · Accepted Answer · 2014-10-17 01:49:31Z

1

First of all, JSON is a text-based data-interchange format, it's not an object.

To check if a key exists in an object, you can use the in operator.

$.getJSON(sSource, aoData, function (data) {
    if ('errorMessage' in data) {
        //there was an error
    }
});

answered Oct 17, 2014 at 1:49

plalx

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