This is a template where everything regarding Japanese club football is drawn together: various league and cup seasons and participating clubs.
There is a parameter named "group" which allows specific group to appear uncollapsed when you open the template. This makes navigation easier. For example, if you are in some of Japan Soccer League seasons, you might want to see the other first-tier seasons in the first place. To do so, insert the template as follows: {{Japanese Club Football|group=first}}
and you will receive:
The full list of parameter values:
The clubs are shown as per current season; the order is traditional for Japanese football north-to-south according to their geographical location.
"Defunct clubs" include those who competed in the top three national tiers only. Relegated clubs who currently compete in the Regional Leagues or below are not included.