Shown in the output of the <comments /> tag instead of the person's comment if you're ignoring the said person.

<div class="hlist plainlinks api-main-links">
* [[mw:API:Main_page|Documentation]]
* [[mw:API:FAQ|FAQ]]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-api Mailing list]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce API Announcements]
* [https://phabricator.wikimedia.org/maniphest/query/GebfyV4uCaLd/#R Bugs & requests]
</div>
<strong>Status:</strong> All features shown on this page should be working, but the API is still in active development, and may change at any time. Subscribe to [https://lists.wikimedia.org/pipermail/mediawiki-api-announce/ the mediawiki-api-announce mailing list] for notice of updates.

<strong>Erroneous requests:</strong> When erroneous requests are sent to the API, an HTTP header will be sent with the key "MediaWiki-API-Error" and then both the value of the header and the error code sent back will be set to the same value. For more information see [[mw:API:Errors_and_warnings|API: Errors and warnings]].

<strong>Testing:</strong> For ease of testing API requests, see [[Special:ApiSandbox]].

Some parameter types in API requests need further explanation:
;boolean
:Boolean parameters work like HTML checkboxes: if the parameter is specified, regardless of value, it is considered true. For a false value, omit the parameter entirely.
;timestamp
:Timestamps may be specified in several formats. ISO 8601 date and time is recommended. All times are in UTC, any included timezone is ignored.
:* ISO 8601 date and time, <kbd><var>2001</var>-<var>01</var>-<var>15</var>T<var>14</var>:<var>56</var>:<var>00</var>Z</kbd> (punctuation and <kbd>Z</kbd> are optional)
:* ISO 8601 date and time with (ignored) fractional seconds, <kbd><var>2001</var>-<var>01</var>-<var>15</var>T<var>14</var>:<var>56</var>:<var>00</var>.<var>00001</var>Z</kbd> (dashes, colons, and <kbd>Z</kbd> are optional)
:* MediaWiki format, <kbd><var>2001</var><var>01</var><var>15</var><var>14</var><var>56</var><var>00</var></kbd>
:* Generic numeric format, <kbd><var>2001</var>-<var>01</var>-<var>15</var> <var>14</var>:<var>56</var>:<var>00</var></kbd> (optional timezone of <kbd>GMT</kbd>, <kbd>+<var>##</var></kbd>, or <kbd>-<var>##</var></kbd> is ignored)
:* EXIF format, <kbd><var>2001</var>:<var>01</var>:<var>15</var> <var>14</var>:<var>56</var>:<var>00</var></kbd>
:*RFC 2822 format (timezone may be omitted), <kbd><var>Mon</var>, <var>15</var> <var>Jan</var> <var>2001</var> <var>14</var>:<var>56</var>:<var>00</var></kbd>
:* RFC 850 format (timezone may be omitted), <kbd><var>Monday</var>, <var>15</var>-<var>Jan</var>-<var>2001</var> <var>14</var>:<var>56</var>:<var>00</var></kbd>
:* C ctime format, <kbd><var>Mon</var> <var>Jan</var> <var>15</var> <var>14</var>:<var>56</var>:<var>00</var> <var>2001</var></kbd>
:* Seconds since 1970-01-01T00:00:00Z as a 1 to 13 digit integer (excluding <kbd>0</kbd>)
:* The string <kbd>now</kbd>

If warnings are raised with <kbd>format=json</kbd>, return an API error instead of ignoring them.

Old revision with potential bugs, but which are not worth the effort of reviewing them.

You are ignoring the author of this comment

{{doc-important|If grammatical issues in your language prevent you from translating this literally, translate the following: "The following field is required: $1".}}
Parameters:
* $1 - any one of a number of messages which are the names of fields, as follows:
** {{msg-mw|Donate interface-error-msg-amount}}
** {{msg-mw|Donate interface-error-msg-email}}
** {{msg-mw|Donate interface-error-msg-fname}}
** {{msg-mw|Donate interface-error-msg-lname}}
** {{msg-mw|Donate interface-error-msg-street}}
** {{msg-mw|Donate interface-error-msg-city}}
** {{msg-mw|Donate interface-error-msg-state}}
** {{msg-mw|Donate interface-error-msg-zip}}
** {{msg-mw|Donate interface-error-msg-card_num}}
** {{msg-mw|Donate interface-error-msg-expiration}}
** {{msg-mw|Donate interface-error-msg-cvv}}
An alternative to "field" in the translation could be "information". If the translation of "your" is not the same for all possible fields then you could choose to omit "your" from this message and include it instead in each of the field translations above.

Error message displayed if there is a communications error with the Twitter API.

An error occurred when parsing metadata. Ignoring user input.

Si las advertencias están planteadas con <kbd>format=json</kbd>, devolver un error de API en lugar de hacer caso omiso de ellas.

Used to display an integer parameter with a maximum but no minimum value.

Parameters:
* $1 - 1 if the parameter takes one value, 2 if the parameter takes any number of values
* $2 - (Unused)
* $3 - Maximum value
See also:
* {{msg-mw|Api-help-param-integer-min}}
* {{msg-mw|Api-help-param-integer-minmax}}

Used to display an integer parameter with a minimum but no maximum value

Parameters:
* $1 - 1 if the parameter takes one value, 2 if the parameter takes any number of values
* $2 - Minimum value
* $3 - unused

See also:
* {{msg-mw|api-help-param-integer-max}}
* {{msg-mw|api-help-param-integer-minmax}}

Used to display an integer parameter with a maximum and minimum values

Parameters:
* $1 - 1 if the parameter takes one value, 2 if the parameter takes any number of values
* $2 - Minimum value
* $3 - Maximum value

See also:
* {{msg-mw|api-help-param-integer-min}}
* {{msg-mw|api-help-param-integer-max}}

Shown instead of an event timeline when there are no events

Shown instead of a list if there are no courses for this user. Parameters:
* $1 is the user name

Details of the error are attached to the report, which will be publicly viewable. If you are not comfortable with that, you can edit the report below and remove all the data you don't want to share.

Error message shown instead of a course undeletion link, if the user is not authorized to undelete courses.

'''Your user account has not yet been migrated to the unified login system of {{int:Centralauth-groupname}}.'''

If you choose to migrate your accounts, you will be able to use the same username and password to log in to all wikis of {{int:Centralauth-groupname}} in all available languages.

If someone else has already taken your username on another site this will not disturb them, but it will give you a chance to work it out with them or with an administrator later.

Error shown when user is not logged in.

Parameters:
* $1 - URL of login page, with return pointing to [[Special:PronunciationRecording]]

Parameters:
* $1 - a push target
If there are 2 or more targets, the following message will be used instead of this message:
* {{msg-mw|push-special-select-targets}}

Message shown to anonymous users after they've voted in a poll, prompting them to join the wiki.

<nowiki>{{PLURAL}}</nowiki> can be used as this message supports full wikitext parsing.

Parameters:
* $1 - the total amount of points the registered user can receive from voting in polls (0, 5, 10, 15, ...)

Registered users are shown the following message instead:
* {{msg-mw|Poll-voted-for}}

Warning displayed during preview when editing a page if #incat parser function acted incorrectly (Acting incorrectly means acting as if page was not in category, but page actually is). This can happen during preview, since the categories from the last saved revision are used instead of the categories specified in the page text. Once page is saved, the correct categories should be used. This error can also be caused by conditional category inclusion (<code><nowiki>{{#ifpageincat:Foo||[[category:Foo]]}}</nowiki></code>. See also {{msg-mw|pageincat-very-wrong-warn}}.

*$1 is the list of categories (in a localized comma separated list with the last two items separated by {{msg-mw|and}}. The individual category names will be italicized).
*$2 is how many categories

An error message that tells if the category names in $1 are invalid.

Parameters:
* $1 - a comma seperated list of provided invalid category names
* $2 - a positive number for the plural rule

Error message shown to logged in users when they attempt to run more than some number of concurrent searches.  Includes a not about logging in to get their own limits if you are sharing an IP address.

{{doc-special|CommentIgnoreList}}
The comment ignore list contains a list of users whose comments you are ignoring; an ignored comment won't show up by default and you have to click on a special link to view it