Any synonyms for "requiredness"?

Solution 1:

Consider necessity, from ODO

The state or fact of being required

the necessity of providing parental guidance:

It is a synonym of requiredness, from ODO

The fact or quality of being required; necessity, obligatoriness

I'm no programmer, but requiredness is okay to be used for this purpose. Here's an example from IBM site.

Or simply using required would be fine.

Solution 2:

You could use need. After all, require means to need something.

Here is a fancy word, desideration, from Wiktionary

The act of desiderating. (expressing a need or wish to have or attain)

Something desired or required.

Also, Try demand - a strong need for something.