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This module powers the chart templates: {{Single chart}}, {{Album chart}}, {{Year-end single chart}}, and {{Year-end album chart}}.

It generates table rows with chart name, reference, and peak position for music releases. Chart data is stored in four distinct JSON pages, allowing easy maintenance without editing Lua code.

Charts output

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Architecture

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JSON pages

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Page Purpose
Module:Music chart/single.json Weekly single chart definitions (formatting schema included)
Module:Music chart/album.json Weekly album chart definitions
Module:Music chart/year-end-single.json Year-end single chart definitions
Module:Music chart/year-end-album.json Year-end album chart definitions

Helpers for individual charts:

Template integration

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Each template calls the module with a type parameter that determines which JSON page to load: 

<!-- Template:Single chart -->
<includeonly>{{#invoke:Music chart|main|type=single}}</includeonly>

<!-- Template:Album chart -->
<includeonly>{{#invoke:Music chart|main|type=album}}</includeonly>

<!-- Template:Year-end single chart -->
<includeonly>{{#invoke:Music chart|main|type=year-end-single}}</includeonly>

<!-- Template:Year-end album chart -->
<includeonly>{{#invoke:Music chart|main|type=year-end-album}}</includeonly>

All arguments from template calls are passed automatically. For example: 

{{Single chart|Australia|1|artist=Beyoncé|song=Halo|access-date=January 1, 2025}}

The module receives: 1=Australia, 2=1, artist=Beyoncé, song=Halo, access-date=January 1, 2025, type=single.

Output structure

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The template produces two table cells and a reference: 

| Chart Name (Provider)<ref name="refname">"[url url_title]". lang. ref. ref_note. Retrieved access-date.</ref>
| style="text-align:center;"| Position

With rowheader=true: 

! scope="row"| Chart Name (Provider)<ref>...</ref>
| style="text-align:center;"| Position

With note parameter: 

| Chart Name (Provider)<ref>...</ref><br>''<small>Note text</small>''
| style="text-align:center;"| Position

Template parameters

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Parameters passed to the template are used as placeholders in URL and title templates.

Common parameters

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Parameter Description
1 (chart) Chart key (required). Must match a key in JSON data.
2 (position) Peak position on the chart (required). Must be a number 1–200 or dash (–) for not charted.
3 Set to M for manual reference mode.
artist Artist name.
song / album Song or album title (depending on chart type).
year, week Chart week identifiers.
date Chart date (format depends on chart).
songid, artistid, chartid, id Numeric IDs for some charts.
url, title For charts requiring user-provided URL.
access-date Date when source was accessed.
publish-date Publication date of the source (shown in reference for year-end charts).
archive-url, archive-date Archive link and date for archived sources.
refname Custom reference name (overrides auto-generated).
rowheader Set to true to output chart name as row header.
note Additional note displayed below chart name in small italic text.
refgroup Reference group name for grouping footnotes (e.g., lower-alpha).
dvd DVD/video title (alternative to album for music video charts).

Computed placeholders

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Derived automatically from the date parameter. All formats work with any input date format (YYYY-MM-DD, YYYYMMDD, YYMMDD, DD-MM-YYYY, DD.MM.YYYY):

Placeholder Output format Example (any input → output)
{dateDigits} YYYYMMDD (digits only) 20240115
{dateMDY} Month Day, Year January 15, 2024
{dateDMY} DD.MM.YYYY 15.01.2024
{dateYMD} YYYY-MM-DD 2024-01-15
{dateSlash} D/M/YYYY (no leading zeros) 15/1/2024
{dateYear} YYYY 2024

Manual reference mode

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For special cases where automatic URL generation doesn't work, use manual mode by setting the third parameter to M: 

{{Single chart|Australia|1|M
|url=https://example.com/custom-source
|title=Custom Source Title
|work=Billboard
|date=January 1, 2025
|access-date=January 5, 2025
}}

Manual mode:

  • Requires url and title parameters
  • Generates reference using {{cite news}} format
  • Supports additional params: work, location, publisher, date, archive-url, archive-date, url-status
  • Uses same chart name and provider from JSON

JSON data format

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Each JSON page contains chart definitions grouped by country/region. The structure is: 

{
  "_schema": { ... },
  "CountryGroup1": {
    "ChartKey1": { ... },
    "ChartKey2": { ... }
  },
  "CountryGroup2": {
    "ChartKey3": { ... }
  }
}

Keys starting with _ (like _schema) are ignored by the module and can be used for documentation.

Basic chart entry

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{
  "Australia": {
    "Australia": {
      "chart": "Australia",
      "provider": "[[ARIA Charts|ARIA]]",
      "url": "https://australian-charts.com/showitem.asp?interpret={artist}&titel={song}&cat=s",
      "url_title": "{artist} – {song}",
      "ref": "[[ARIA Charts|ARIA Top 50 Singles]]."
    },
    "AustraliaKent": {
      "chart": "Australia",
      "provider": "[[Kent Music Report]]",
      "ref": "{{cite Kent|page={page}}}"
    }
  }
}

Note: If chart is omitted, the country group name is used as the chart name.

Core fields

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Field Required Description Example
chart No Display name for the chart. Defaults to country group name. "Australia"
provider No Provider name shown in parentheses after chart name. Supports wikilinks. "ARIA"
url Yes* URL template with {placeholders}. If starts with [, treated as pre-built wikilink. "https://example.com/{artist}"
url_title Yes* Link title template. Combined with URL as "[url title]". "{artist} – {song}"
ref Yes* Reference text shown after URL. Supports wikilinks and templates. "ARIA Charts."
lang No Language note inserted between URL and ref. "(in German)" or "(in German)"

* At least ref is required. url and url_title are required for charts with links.

URL encoding

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The encode field controls how text parameters ({artist}, {song}, {album}, {dvd}) are encoded in URLs. Other parameters (IDs, dates, numbers) are not affected. It's an array of operations applied in fixed order.

Operation Description Example
normalize Remove diacritics (accents). Converts é→e, ñ→n, ü→u, etc. Use for sites like Billboard that don't support accented characters in URLs. Céline → Celine
ansi Latin-1 (ISO-8859-1) encoding instead of UTF-8. Encodes é as %E9 (single byte) instead of %C3%A9 (UTF-8). Use for legacy sites like Hung Medien. Céline → C%E9line
lower Convert to lowercase The Beatles → the beatles
clean-symbols Remove special characters. Keeps only letters (a-z, A-Z), numbers (0-9), and dashes (-). Spaces become dashes. Symbols between digits become dashes (e.g., 2.0 → 2-0). 20/20 Experience! → 20-20-experience
space-plus Replace spaces with +, full URL encoding. This is the default — only specify explicitly in multiple entries when overriding a different chart-level space setting. The Beatles → The+Beatles
space-dash Replace spaces with -, encode only non-ASCII. Preserves ASCII symbols like $, '. Use for Billboard and similar sites. A$AP Rocky → A$AP-Rocky
space-url Replace spaces with %20 (standard URL encoding) The Beatles → The%20Beatles

Order in array doesn't matter — operations are always applied in this sequence: normalize → lower → clean-symbols → space replacement → URL encoding.

Entry-level encode: The encode field can also be set in multiple entries to override the chart-level setting for specific URL variants.

Examples:

encode Input Output
(not specified) The Beatles The+Beatles
["ansi"] Céline Dion C%E9line+Dion
["space-dash"] The Beatles The-Beatles
["space-dash"] A$AP Rocky A$AP-Rocky
["space-url"] The Beatles The%20Beatles
["normalize", "space-dash"] Céline Dion Celine-Dion
["normalize", "lower", "clean-symbols", "space-dash"] 20/20 Experience! 20-20-experience
["ansi", "space-dash"] Céline Dion C%E9line-Dion

Date validation

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The date_format field specifies expected date format. If provided, the module validates user input and shows error for invalid dates.

Format Pattern Example
YYYY-MM-DD 4-2-2 digits with dashes 2024-01-15
YYYYMMDD 8 digits 20240115
DD-MM-YYYY 2-2-4 digits with dashes 15-01-2024
MM-DD-YYYY 2-2-4 digits with dashes 01-15-2024
DD.MM.YYYY 2-2-4 digits with dots 15.01.2024
YYMMDD 6 digits 240115
DD.MM.YYYY–DD.MM.YYYY Date range with dots 15.01.2024–21.01.2024
YYYY.MM.DD–YYYY.MM.DD Date range with dots (Korean) 2024.01.15–2024.01.21
YYYYMMDD-YYYYMMDD Date range 20240115-20240121

Date range separators: For date range formats, the module accepts en-dash (–), hyphen (-), and tilde (~) as separators. In the params column of showCharts output, all separators are displayed as hyphen for consistency.

Use date_format_alt to accept an alternative format.

Year and week validation

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The module also validates year and week parameters when provided:

  • year must be exactly 4 digits (e.g., 2024)
  • week must be 1–2 digits (e.g., 1, 03, 52) or combined format like 51+52

If the parameter is used in URL construction (critical), an error is shown in red and the page is added to tracking category. If only used in reference text, a warning is shown in preview mode only.

Other fields

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Field Description
defunct Set true for inactive charts. Adds tracking category and highlights row in showCharts table.
alias_for Variant to another chart key. Entry should contain ONLY this field. Should gradually be replaced with the main ones and deleted.
ref_note Note/instruction shown AFTER ref in standard mode, or as prefix in combine mode. Can be overridden in multiple entries.
ref_suffix Text added AFTER "Retrieved date" in reference. Useful for additional notes that should appear at the very end.
refname_format Custom ref name format with placeholders. Supports {param|default} syntax.
url_validation Required substring in user-provided URL. Shows error "Invalid URL. Required domain: X." if missing.
track_param Parameter name to track. Creates category if parameter is missing.
number_one_category Category added when position equals 1.
category_conditions Array of conditional categories. Each element: {"when": "condition", "category": "Category name"}. See Condition syntax. All matching conditions add their category.
doc_note Documentation note shown in showCharts table (when notes=yes). Can be set at chart level or in individual multiple entries.

Note: Punctuation (periods) between reference parts is added automatically by the module. Do not include trailing periods in ref, ref_note, or ref_suffix values in JSON.

Multiple URL variants

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For charts that have different URL structures depending on available parameters, use the multiple array: 

{
  "Denmark": {
    "chart": "Denmark",
    "provider": "[[Hitlisten|Tracklisten]]",
    "multiple": [
      {
        "when": "year, week",
        "url": "http://hitlisten.nu/default.asp?w={week}&y={year}&list=t40",
        "url_title": "Track Top-40 – Hitlisten.NU",
        "lang": "(in Danish)"
      },
      {
        "when": "artist, song",
        "url": "https://danishcharts.dk/showitem.asp?interpret={artist}&titel={song}&cat=s",
        "url_title": "{artist} – {song}"
      }
    ],
    "ref": "[[Hitlisten|Tracklisten]]."
  }
}

The module checks entries in order and uses the first one where when condition matches.

Condition syntax

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Syntax Meaning Example
param Parameter exists and is not empty "when": "year"
!param Parameter is missing or empty "when": "!url"
param=value Parameter equals specific value "when": "type=remix"
param<value Parameter is less than value (numeric) "when": "year<1987"
param>value Parameter is greater than value (numeric) "when": "year>2000"
param<=value Parameter is less than or equal (numeric) "when": "year<=2002"
param>=value Parameter is greater than or equal (numeric) "when": "year>=2003"
date<value Year from date is less than value "when": "date<2016"
archivedate<value Year from archivedate is less than value "when": "archivedate<2016"
a, b AND — all conditions must match "when": "year, week"
a | b OR — any condition must match "when": "artist | song"
helper=value Helper function returns specific value "when": "helper=before2016w34"
(empty) Default fallback — always matches "when": ""

Notes:

  • Conditions are checked in order; first match wins (for multiple)
  • For category_conditions, ALL matching conditions add their categories
  • Numeric comparisons convert values to numbers; non-numeric values become 0
  • For date, archivedate, and archive-date parameters, comparisons extract the year (first 4 characters) from the value
  • The position parameter is available in category_conditions

Entry overrides

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Each entry in multiple can override these fields from the parent chart:

  • url, url_title, encode
  • ref, ref_note, lang
  • provider, chart
  • refname_format
  • date_format, date_format_alt
  • doc_note (for showCharts documentation)

Example: Different chart names by year

Some charts changed names over time. Use multiple with year conditions to override chart: 

{
  "Billboarddanceclubsongs": {
    "chart": "US [[Dance Club Songs]]",
    "provider": "''[[Billboard (magazine)|Billboard]]''",
    "url": "https://www.billboard.com/artist/{artist}/chart-history/DSI",
    "url_title": "{artist} Chart History (Dance Club Songs)",
    "ref": "''[[Billboard (magazine)|Billboard]]''",
    "encode": ["lower", "space-dash"],
    "multiple": [
      {"when": "year<1987", "chart": "US [[Hot Dance Club Play]]"},
      {"when": "year<2003", "chart": "US [[Hot Dance Music/Club Play]]"}
    ]
  }
}

This outputs:

The module checks entries in order. If no when matches, it uses the parent chart's values.

Use ref_note in entries for conditional notes (e.g., instructions for old chart entries): 

{
  "Germany": {
    "chart": "Germany",
    "provider": "[[GfK Entertainment charts|GfK]]",
    "url": "https://www.offiziellecharts.de/titel-details-{songid}",
    "url_title": "Offizielle Deutsche Charts",
    "lang": "(in German)",
    "ref": "[[GfK Entertainment charts]]",
    "multiple": [
      {"when": "year<1977", "ref_note": "To see the peak chart position, click 'TITEL VON', followed by the artist's name"}
    ]
  }
}

In showCharts table, conditional overrides are shown inline: [year<1977 → ref_note text]

Combine mode

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Set "combine": true to include ALL matching entries as a bullet list in one reference: 

{
  "Finland": {
    "chart": "Finland",
    "provider": "[[The Official Finnish Charts|Suomen virallinen lista]]",
    "ref_note": "The first is domestic singles, the second is foreign:",
    "multiple": [
      {
        "url": "http://www.ifpi.fi/tilastot/myydyimmat/{year}/kotimaiset/singlet",
        "url_title": "Myydyimmät kotimaiset singlet vuonna {year}",
        "lang": "(in Finnish)"
      },
      {
        "url": "http://www.ifpi.fi/tilastot/myydyimmat/{year}/ulkomaiset/singlet",
        "url_title": "Myydyimmät ulkomaiset singlet vuonna {year}",
        "lang": "(in Finnish)"
      }
    ],
    "combine": true,
    "ref": "Musiikkituottajat – IFPI Finland."
  }
}

Output reference will contain: 

The first is domestic singles, the second is foreign:
* "[url1 title1]" (in Finnish). Musiikkituottajat – IFPI Finland. Retrieved January 1, 2025.
* "[url2 title2]" (in Finnish). Musiikkituottajat – IFPI Finland. Retrieved January 1, 2025.

Helper functions

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Helpers are special Lua functions for dynamic URL generation. They're defined in the module and referenced by name in JSON.

Conditional categories

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The category_conditions field allows adding categories based on parameter values. Unlike number_one_category (which only checks position=1), this supports complex conditions. 

{
  "UKsinglesdownloads": {
    "chart": "UK [[UK Singles Downloads Chart|Singles Downloads]]",
    "provider": "[[Official Charts Company|OCC]]",
    "category_conditions": [
      {"when": "position=1", "category": "UK Singles Downloads Chart number-one singles"}
    ],
    "url": "...",
    "ref": "..."
  }
}

Multiple conditions can be specified — all matching conditions add their categories: 

"category_conditions": [
  {"when": "position=1", "category": "Number-one singles"},
  {"when": "position<=10", "category": "Top 10 singles"},
  {"when": "year>=2020", "category": "2020s chart entries"}
]

The position parameter is available in conditions even though it's not a template parameter — it's extracted from the second positional argument.

Available helpers

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Helper Charts Required params Description
south_africa_size single: Southafrica2 year, week Returns chart size (10/20/50/100) based on year and week. Chart size changed multiple times: 2021-2022 → 100, 2023 w18+ → 10, 2025 w13+ → 50, etc.
australia_issue single: Australiadance, Australiapandora, Australiaurban url Extracts issue number from pandora.nla.gov.au URL. Matches patterns like "Issue+123" or "issue%20456".
bulgaria_date_range single: Bulgaria url Extracts and formats date range from bamp-bg.org URL. Converts "01012024-07012024.html" to "01.01.2024 – 07.01.2024".
slovakia_period single: Slovakdigital, Slovakradio year, week Returns period identifier: "before2016w34" (≤week 34), "after2016w34" (weeks 35–42), or "use_new_chart" (≥week 43, shows error recommending Slovakia2/Slovakdigital2).
czech_week_id single: Czech Republic, Czechdigital, Slovakia2, Slovakdigital2; album: Czech, Slovakia year, week Returns weekId for ifpicr.cz URL. Looks up ID from Module:Music chart/chartdata-czech.json; for future weeks beyond table, calculates based on newest entry. Weeks 51+52 share same ID.
germany_timestamp album: GermanyComp date Converts DD.MM.YYYY to Unix timestamp in milliseconds for URL construction.

Using helpers in JSON

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{
  "Southafrica2": {
    "chart": "South Africa",
    "provider": "[[The Official South African Charts|TOSAC]]",
    "helper": "south_africa_size",
    "url": "https://theofficialsacharts.co.za/chart/{year}/{week}/top-{helper}",
    "url_title": "Top {helper} – Week {week}, {year}",
    "ref": "[[The Official South African Charts]]."
  }
}

The {helper} placeholder is replaced with the helper function's return value.

Adding new helpers

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1. Add function in module: 

function Helpers.your_helper_name(args)
    local year = tonumber(args.year) or 0
    -- your logic here
    return "result"
end

2. Register required parameters: 

Helpers.params = {
    your_helper_name = {"year", "week"},  -- params won't be flagged as "unused"
    -- ...
}

3. Use in JSON: 

{
  "helper": "your_helper_name",
  "url": "https://example.com/{helper}"
}

Adding new charts

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Step 1: Edit JSON page. Open the appropriate JSON page and add entry under country group: 

"NewCountry": {
  "NewCountry": {
    "chart": "New Country Singles",
    "provider": "[[New Chart Provider]]",
    "url": "https://example.com/chart?artist={artist}&song={song}",
    "url_title": "{artist} – {song}",
    "ref": "New Chart Provider."
  }
}

Step 2: Verify. Use showCharts to verify: 

{{#invoke:Music chart|showCharts|type=single|country=NewCountry}}

Check that:

  • Required params are correctly detected
  • Sample output looks correct
  • No errors in output

Step 3: Add testcases. Add cases to the both proper parameters section and errors section.

Common patterns

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Simple chart (artist + song): 

"SimpleChart": {
  "chart": "Simple Chart",
  "provider": "[[Provider]]",
  "url": "https://example.com/{artist}/{song}",
  "url_title": "{artist} – {song}",
  "ref": "Provider Name."
}

Chart with date: 

"DateChart": {
  "chart": "Date Chart",
  "provider": "[[Provider]]",
  "date_format": "YYYY-MM-DD",
  "url": "https://example.com/chart/{date}",
  "url_title": "Chart for {dateMDY}",
  "ref": "Provider Name."
}

Chart with year/week: 

"WeekChart": {
  "chart": "Week Chart",
  "provider": "[[Provider]]",
  "url": "https://example.com/{year}/week-{week}",
  "url_title": "Week {week}, {year}",
  "ref": "Provider Name."
}


Chart requiring user URL: 

"ManualUrlChart": {
  "chart": "Manual URL Chart",
  "provider": "[[Provider]]",
  "url_validation": "example.com",
  "url": "{url}",
  "url_title": "Chart Page",
  "ref": "Provider Name."
}

Defunct chart: 

"OldChart": {
  "chart": "Old Chart",
  "provider": "[[Provider]]",
  "defunct": true,
  "ref": "Provider Name (defunct)."
}

Module configuration

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The CONFIG table at the top of the module contains all settings.

Text output

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  • months — month names array for {dateMDY} placeholder
  • type_names — display names for chart types
  • errors — error message templates
  • warnings — warning templates shown in preview mode
  • text — reference text templates
  • categories — tracking category templates

Position validation

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  • max_position — maximum allowed numeric position (default: 200)
  • accepted_dashes — array of accepted dash characters for "not charted" position; en-dash (–) for enwiki, em-dash (—) for ruwiki, hyphen (-) as fallback. Example: {"–", "—", "-"}

Core settings

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  • default_type — default chart type when not specified
  • json_path — path template to JSON data files, %s replaced with type
  • category_prefix — namespace prefix for categories
  • date_format_mdy — format string for {dateMDY} placeholder (%M = month name, %d = day, %Y = year)
  • ref_prefixes — prefixes for auto-generated refnames by type
  • error_display — where errors appear: "both" (cell and ref), "cell" only, or "ref" only
  • check_unknown_params — enable/disable tracking of unknown parameters (default: true)
  • check_unused_params — enable/disable tracking of unused parameters (default: true)
  • date_wrapper — optional template to reformat dates in references; set to nil to output as-is, or use parser function like {{#iferror:{{#time:j F Y|%s}}|%s}} to convert "2025-01-15" → "15 January 2025"
  • date_patterns — Lua patterns for validating date formats
  • param_aliases — alternative parameter names that map to canonical names
  • params — parameter validation groups:
    • base — always allowed
    • content — chart-specific
    • manual — only with |3=M mode
    • Unknown parameters trigger tracking category; add new valid params here to suppress warnings

showCharts settings

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  • sort_order — sort order for groups and chart IDs: "abc" (alphabetical) or "keep" (preserve JSON order)
  • group_wrapper — optional template for country/group names, e.g. {{Country|%s}}; to exclude specific groups from wrapping, add [no wrap] to the group name in JSON

Reference prefixes

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ref_prefixes maps chart types to their reference name prefixes:

  • single → "sc" (produces refs like sc_Australia_Beyoncé)
  • album → "ac" (produces refs like ac_Billboard200_Taylor Swift)
  • year-end-single and year-end-album → "ye" (produces refs like ye_US_2024)

Reference naming

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Default reference name format: {prefix}_{chartkey}_{suffix}

  • Prefix: from ref_prefixes (sc, ac, ye)
  • Suffix: artist for weekly charts, year for year-end charts

Examples:

  • sc_Australia_Beyoncé
  • ac_Billboard200_Taylor Swift
  • year-end_US_2024

Custom format via refname_format in JSON: 

"refname_format": "sc_Oricon2_{songid}"
"refname_format": "sc_Finland_{artist}_{song|Airplay}"

The {param|default} syntax provides fallback if param is empty.

Entry points

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main

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Primary function called by templates. Processes all arguments and generates table row output. 

{{#invoke:Music chart|main|type=single}}

chartExists

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Utility function to check if a chart key exists in the JSON data. 

{{#invoke:Music chart|chartExists|chart=Australia|type=single}}

Returns 1 if chart exists, 0 otherwise. Useful for conditional logic in templates.


showCharts

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Generates a table showing all charts from JSON with sample outputs. 

{{#invoke:Music chart|showCharts|type=single}}

Output columns:

Column Parameter (default) Description
— type (single) Chart type: single, album, year-end-single, year-end-album
Group country (all) Filters to one country/region group
Chart ID — Chart key. Aliases in yellow, defunct in red, multiple entries show condition.
Uses uses (yes) Page count using this chart (links to category)
Chart — Display name of the chart
Provider — Chart provider name
Required params params (yes) Parameters needed, date format in brackets
#1 Category number1 (no) Category when position=1
Sample ref output ref (yes) Generated reference with sample values
Note notes (no) Shows doc_note from JSON. Consecutive identical notes are merged with rowspan.
— splitdvd (no) When yes, charts ending with "MV" (Music DVD) are output in a separate table below the main table.

Example with all parameters: 

{{#invoke:Music chart|showCharts|type=single|country=Australia|uses=yes|params=yes|number1=yes|ref=yes|notes=yes|splitdvd=yes}}

Notes column: When notes=yes, displays doc_note field from JSON for each chart. For charts with multiple entries, each entry can have its own doc_note that overrides the chart-level note. Consecutive rows with identical notes are automatically merged using rowspan.

Output includes links to JSON data page and template testcases page.

Error handling

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Validation checks

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The module performs these validations:

  1. Missing chart key — Error if first parameter is empty
  2. Unknown chart — Error if chart key not found in JSON
  3. Missing required parameters — Error if placeholders in URL/title can't be filled
  4. Invalid date format — Error if date doesn't match expected format (when date_format specified)
  5. Invalid year format — Error if year is not exactly 4 digits
  6. Invalid week format — Error if week is not 1–2 digits (or combined like "51+52")
  7. URL validation — Error if user URL doesn't contain required substring (when url_validation specified)
  8. Unsubstituted placeholders — Error if output still contains {placeholder} patterns

Error display

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Errors appear as red text. The error_display config controls where:

  • "both" — Show in both table cell and reference
  • "cell" — Show only in table cell
  • "ref" — Show only in reference

Warnings (preview only)

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Some issues show orange warnings only in preview mode (not on saved pages):

Warning When shown
Unused parameters Parameters provided but not used by chart
Invalid date (ref only) Date format invalid, but date only used in reference text (not URL)
Invalid year/week (ref only) Year/week format invalid, but only used in reference text (not URL)

Detection uses {{REVISIONID}} — empty in preview, has value on saved pages.

If date is used in URL, invalid format shows as red error on all pages.

Tracking categories

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Categories are added for various conditions:

Category pattern When added
{Type} chart usages for {ChartKey} Always (for usage tracking)
{Type} chart used with missing parameters Required params missing
{Type} chart used with unknown chart Chart key not found
{Type} chart with invalid position Position is not a valid number (1–200) or accepted dash
Pages using {type} chart with unknown parameters Unknown params provided
{Type} chart with unused parameters Params provided but not used
{Type} chart called without artist Artist param missing
{Type} chart called without song Song param missing (single charts)
{Type} chart called without album Album or dvd param missing (album charts)
{Type} chart used with defunct chart Chart marked as defunct
{Type} chart making named ref Custom refname provided
{Type} chart using manual ref mode Manual mode (3=M) used
{Type} chart with manual mode missing url or title Manual mode used without url or title

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