De or het kluiscode?

The correct Dutch article is:

de kluiscode

Rule Words ending in -ode: always de. See the rule

How to use kluiscode

the kluiscodede kluiscode
this kluiscodedeze kluiscode
that kluiscodedie kluiscode
our kluiscodeonze kluiscode
your kluiscodejouw kluiscode
every kluiscodeelke kluiscode
which kluiscode?welke kluiscode?
a big kluiscode / the big kluiscodeeen grote kluiscode, de grote kluiscode