I noticed https://www.mediawiki.org/w/api.php?action=help&modules=compare wasn't displaying its help url, because it's not defined in the PHP code...
I suspect that this might not be the only one.
Ideally, all WMF production/MW release bundled API modules should have these documented, where the pages exist...
Where they don't exist, they do want creating at some point...
$json = json_decode( file_get_contents( 'https://www.mediawiki.org/w/api.php?action=paraminfo&format=json&modules=' . urlencode( '**' ) ), true ); foreach( $json['paraminfo']['modules'] as $m ) { if ( $m['helpurls'] === [] ) { echo "| `" . $m['path'] . "` | `" . $m['classname'] . "` |\n"; } }