This module may be appended to a template to check for uses of unknown parameters.

{{#invoke:check for unknown parameters|check|unknown=[[Category:Some tracking category]]|arg1|arg2|arg3|argN}}

or to sort the entries in the tracking category by parameter with a preview error message

{{#invoke:check for unknown parameters|check|unknown=[[Category:Some tracking category|_VALUE_]]|preview=unknown parameter "_VALUE_"|arg1|arg2|...|argN}}

or for an explicit red error message

{{#invoke:check for unknown parameters|check|unknown=<span>Sorry, I don't recognize _VALUE_</span>|arg1|arg2|...|argN}}

Here,arg1,arg2, ...,argN, are the known parameters. Unnamed (positional) parameters can be added too:|1|2|argname1|argname2|.... Any parameter which is used, but not on this list, will cause the module to return whatever is passed with theunknown parameter. The_VALUE_ keyword, if used, will be changed to the name of the parameter. This is useful for either sorting the entries in a tracking category, or for provide more explicit information.

By default, the module makes no distinction between a defined-but-blank parameter and a non-blank parameter. That is, both unlisted|foo=x and|foo= are reported. To only track non-blank parameters use|ignoreblank=1.

By default, the module ignores blank positional parameters. That is, an unlisted|2= is ignored. Toinclude blank positional parameters in the tracking use|showblankpositional=1.

This module supportsLua patterns which are useful when there are many known parameters which use a systematic pattern. For example,en:template:infobox3cols uses

| regexp1 = header[%d][%d]*| regexp2 = label[%d][%d]*| regexp3 = data[%d][%d]*[abc]?| regexp4 = class[%d][%d]*[abc]?| regexp5 = rowclass[%d][%d]*| regexp6 = rowstyle[%d][%d]*| regexp7 = rowcellstyle[%d][%d]*

to match all parameters of the formheaderNUM,labelNUM,dataNUM,dataNUMa,dataNUMb,dataNUMc, ...,rowcellstyleNUM, where NUM is a string of digits.

{{Infobox| above = {{{name|}}}| label1 = Height| data1 = {{{height|}}}| label2 = Weight| data2 = {{{weight|}}}| label3 = Website| data3 = {{{website|}}}}}<!--   end infobox, start tracking-->{{#invoke:Check for unknown parameters|check| unknown = {{main other|[[Category:Some tracking category|_VALUE_]]}}| preview = unknown parameter "_VALUE_"| name| height | weight| website}}