TypeError: invalid 'in' operand obj while getting json keys

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I have the following fiddle: http://ift.tt/1ERsMK7

I'm trying to get the keys from a json string, with

var keys = $.map(a, function(element,key) { return key; }); . 

However I am getting:

TypeError: invalid 'in' operand obj

How can I fix this?

asked 29 secs ago

user61629

1,912

TypeError: invalid 'in' operand obj while getting json keys