How to check if ajax return exist?

This question already has an answer here:

JavaScript check if variable exists (is defined/initialized) 28 answers

Checking if a key exists in a JavaScript object? 16 answers

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You can try the following:

$.ajax({
    url: 'DBConnector.php',
    type: 'GET',
    dataType: 'json',
    success: function(data)
    {
        if(data.status !== undefined)
        {
            //YOUR CODE HERE
        }
    }
});

It will check if the status exists or not.

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