Wikimedia edition code, e.g. `en`, `de`, `ja`, `simple` or `zh-min-nan`. Default: `en`.

`articles` for the most-viewed articles (the default), `countries` for the countries that viewed the edition most.

Day (`YYYY-MM-DD`) for `mode=articles`, month (`YYYY-MM`) for `mode=countries`. Default: the latest published one, which is yesterday or last month (UTC), or the one before while that list is not out yet.

Access method. Default: `all-access`.

Country code. With `mode=articles`, ranks that country's articles instead of the global list.