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Deterimne Javascript Object Field Names

gdpotter asked
Last Modified: 2013-11-08
I have a project I am working on which loads in a JSON file.  I quickly convert that JSON file to a Javascript object using jquery with $.parseJSON();.  What I need to do now is to spit out what the field names are.  For example, if my data is this:
field1 : 'field1data',
field2 : 'field2data',
field4 : 'field4data'
field1 : 'field1data',
field3 : 'field3data',
field4 : 'field4data'

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I want to take the field names and load them into an array.  The result in my example would be ['field1', 'field2', 'field3', 'field4'].  I need it to get ALL of them, even if they don't appear in every object.

If possible, I would like to do this without parsing the whole file.  Is there a way I can do this using JavaScript (and maybe jQuery) methods?

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