A handler specific parameter string. For example, PDFs might use <kbd>page15-100px</kbd>. <var>$1urlwidth</var> must be used and be consistent with <var>$1urlparam</var>.

Invalid value for <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

Ugyldig verdi for <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

The <var>revids</var> parameter may not be used with the list options (<var>$1limit</var>, <var>$1startid</var>, <var>$1endid</var>, <kbd>$1dir=newer</kbd>, <var>$1user</var>, <var>$1excludeuser</var>, <var>$1start</var>, and <var>$1end</var>).

מחרוזת פרמטר ייחודית למטפל. למשל, PDF־ים יכולים להשתמש ב־<kbd>page15-100px</kbd>.‏ <var>$1urlwidth</var> צריך לשמש ולהיות עקבי עם <var>$1urlparam</var>.

Рядок окремого параметра. Наприклад, PDF-ки можуть використовувати <kbd>page15-100px</kbd>. <var>$1urlwidth</var> повинно використовуватись і бути сумісним з <var>$1urlparam</var>.

Строковой параметр, зависящий от обработчика. Например, для PDF можно использовать <kbd>page15-100px</kbd>. Должен быть использован <var>$1urlwidth</var>, не противоречащий с <var>$1urlparam</var>.

The <var>section</var> parameter must be a valid section ID or <kbd>new</kbd>.

Cannot be used with <var>$3user</var>.

Некорректное значение <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

Nieprawidłowa wartość <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

Недійсне значення для <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

Valor inválido para <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

Valor inválido para <var>$1urlparam</var> (<kbd>$2=$3</kbd>).

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>

The <var>$1</var> parameter must be a scalar.

<var>$1project</var> and <var>$1title</var> must be used together.

Liste von Abfragemodulnamen (Werte von <var>prop</var>-, <var>meta</var>- oder <var>list</var>-Parameter). Benutze <kbd>$1modules=query+foo</kbd> anstatt <kbd>$1querymodules=foo</kbd>.

The <kbd>name</kbd> sort option cannot be used together with <var>$1changedsince</var>.

The <var>$1</var> parameter must be set.

The <var>$1</var> parameter must be an array.

<kbd>section=new</kbd> cannot be combined with the <var>oldid</var>, <var>pageid</var> or <var>page</var> parameters. Please use <var>title</var> and <var>text</var>.

Список модулей query (значения параметров <var>prop</var>, <var>meta</var> или <var>list</var>). Используйте <kbd>$1modules=query+foo</kbd> вместо <kbd>$1querymodules=foo</kbd>.

Input to MediaWiki should be NFC-normalized UTF-8. MediaWiki may attempt to convert other input, but this may cause some operations (such as [[Special:ApiHelp/edit|edits]] with MD5 checks) to fail.

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>
;alternative multiple-value separator
:Parameters that take multiple values are normally submitted with the values separated using the pipe character, e.g. <kbd>param=value1|value2</kbd> or <kbd>param=value1%7Cvalue2</kbd>. If a value must contain the pipe character, use U+001F (Unit Separator) as the separator ''and'' prefix the value with U+001F, e.g. <kbd>param=%1Fvalue1%1Fvalue2</kbd>.

Modules to display help for (values of the <var>action</var> and <var>format</var> parameters, or <kbd>main</kbd>). Can specify submodules with a <kbd>+</kbd>.