Metadata of JSON object in javascript

[knapsack3]

Hi,

I have a JSON object whose structure is like this:

The name of the object is 'Emp' and the attributes are:
name
age
sex
department
address

I need to access the attribute names (not values) in javascript. Pls suggest a method for this.

[knapsack3]

A correction :
"I need to access" -> I need to obtain the attribute names in a local variable

[knapsack3]

I thought I should be eloborate in providing the requirement.

Assume my JSON object is like ths:

The name of the object is 'Emp'

The attributes are:
name
age
sex
department
address

Later in my javascript code, I have to check if the JSON object's value matches with my local value. For this I have to check

if (Emp.name == localvar.name) ...
if (Emp.age == localvar.age) ...

But the problem is I cannot know which of the attributes will come first for comparison, as no predefined order is allowed.
So I have to first find out the current attribute of 'Emp' and accordingly compare the local variable with it.
The problem is I cann't find the current attribute. Can someone pls tell me a way.

Thanks.