Theme schema

Precise reference for both theme file formats: the DOCX ThemeConfig (validated against the generated theme.schema.json) and the PPTX ThemeConfig (usually supplied inline on props.theme). For the conceptual guide — tokens, built-ins, cascades — see Themes & styling.

Shared visual layers

These optional roots use the same schema in DOCX and PPTX. DOCX also accepts them in props.themeOverrides, deep-merging objects and replacing arrays. PPTX accepts them in an inline props.theme or a registered theme. jto://themes/values preserves all these values; jto://themes retains its list of names.

Themes specify appearance. They never require content, an archetype, action titles, sources, trackers, footers or density. Blueprints and quality profiles own those expectations. A coordinate-authored document can use every theme without adding chrome.

palette

Optional scalar keys: rule, textMuted, onPrimary, surfaceInverse, positive, negative. Values are six-digit hex (optional #) or references to legacy colors or these palette keys. Palette keys take precedence over same-named legacy colors; unknown targets and cycles fail generation.

chart is an ordered array of 1–12 such colors. Native charts and Highcharts use it when the author provides no chart colors. Without it, the existing six-token chart palette applies. Quality checks recognize these additional colors.

PPTX component color enums are unchanged: reference new roles inside themes, or use their resolved hex in component props. DOCX component colors can reference new palette names directly.

typography

roles accepts eyebrow, display, stat, quote, label, footer, tableHeader, tableCell, chartLabel, tracker, source. Only declared roles are materialized; role names alone do not restyle existing components.

Role field	Meaning
face	heading, body, mono, light; defaults to body. PPTX missing mono falls back to body, missing light to heading.
weight	Integer 100–900. Overrides bold; numeric weights use the existing synthetic-family mechanism.
size	Explicit 5–200 points; wins over the canvas scale.
lineHeight	Line-height multiple, 0.5–3.
tracking	Hundredths of an em, negative for condensed tracking.
case	none, upper, smallCaps.
color	Hex or theme token.
spaceBefore, spaceAfter	Nonnegative points.

Use themeStyle: "display" on a DOCX paragraph or style: "display" on PPTX text/shape. Native styles.<role> fields override projected role fields, and explicit component formatting wins. DOCX font.case and native theme styles accept the same case values; PPTX native text styles also accept case and paraSpaceBefore.

DOCX writes native caps/small-caps formatting and preserves text. PPTX writes uppercase output text; small caps are emulated by uppercasing lowercase spans at 80% of the run size. Authored JSON remains unchanged. This is not OpenType small-cap glyph selection.

scale.<canvas> takes required base (5–200 pt), optional ratio (1–2, default 1.25) and baselinePt (>0–24, default 4). Derived size is base × ratio^step, snapped to the nearest multiple of baselinePt and clamped to 5–200 pt. A step-0 role keeps base exactly, unsnapped. Steps: display 4, stat 3, quote 1, tableHeader/tableCell 0, eyebrow/label/chartLabel/tracker −1, footer/source −2. Without a canvas scale, roles use the existing body/default size.

Canvas keys are a4, letter, wide169, standard43. DOCX uses theme.page.size: LETTER selects letter; A4, A3, LEGAL and custom dimensions use a4. PPTX selects the closest of 16:9 and 4:3 from document dimensions (default 10 × 7.5 inches); ties use standard43. There is no authored canvas identifier.

spacing

canvas.<canvas> accepts nonnegative safeAreaIn and gutterIn, and integer columns/rows (1–100). DOCX maps safe area to four page margins and gutter to the page gutter, converting inches to twips; section/page overrides still apply. PPTX uses them as grid defaults; the document grid and a group’s gridConfig win. Absolute PPTX coordinates remain absolute.

basePt (>0) and blockGap.tight/normal/loose (≥0) are spacing values in points. DOCX normal-style spacing falls back to blockGap.normal, then basePt, when native normal-style spacing is absent. Its normal size similarly falls back to the selected scale base. Tight/loose gaps and DOCX grid rows/columns are reserved for semantic block consumers; they do not insert blocks or columns. PPTX block gaps are values for those later consumers, not automatic coordinate rearrangement.

chrome and motif

Visual recipes the JSON blocks of both formats paint from. No content is inserted by a theme: a recipe says how a block looks once an author places it.

chrome optionally contains runningHead, tracker, actionTitle, keyTakeaways, sourceLine, confidentialFooter, logoSlot, cover. Each recipe accepts type (a role name), color, fill, rule: { weightPt, color }, padPt and alignment (left/center/right). Weights/padding are nonnegative points. Nothing reads these recipes on its own: a JSON block binds the values it wants with $theme pointers such as /chrome/keyTakeaways/rule/color, so a theme swap restyles every block that binds them. A rule.weightPt of 0 draws no rule.

motif is a single object with required kind (none/rule/corner/band), optional color, weightPt and placement (top, bottom, left, right, topLeft, topRight, bottomLeft, bottomRight). Motif colors are stored for later consumers. Neither schema accepts content requirements.

DOCX theme

Both formats also accept the five optional shared visual layers. Existing themes need none of them.

A DOCX theme is a JSON object (conventionally a *.docx.theme.json file). Unknown top-level properties are rejected (additionalProperties: false).

Field	Type	Required	Description
$schema	string	no	Schema URI for editor tooling. The validator injects ./json-schemas/theme.schema.json when missing.
name	string	yes	Theme identifier — the value documents reference in props.theme.
displayName	string	yes	Human-readable name.
description	string	yes	Short description of the theme.
version	string	yes	Theme version string (built-ins use "2.0.0").
colors	object	yes	The 13-key color scheme (below).
fonts	object	yes	Exactly four font slots (below).
page	object	yes	Page size and margins (below).
styles	object	no	Named paragraph-style presets, compiled into real Word styles (below).
componentDefaults	object	no	Per-component prop defaults (below).
noProofWords	string[]	no	House-style allowlist: whole-word, case-insensitive terms never flagged by Word's spellchecker. The document's own noProofWords merges on top at render.

colors

13 required keys:

primary, secondary, accent, text, background, border, textPrimary, textSecondary, textMuted, borderPrimary, borderSecondary, backgroundPrimary, backgroundSecondary

3 optional keys — accent4, accent5, accent6 — named to match the PPTX palette so both formats share one chart-series vocabulary. They exist for the chart palette, though a theme that defines one makes it referenceable from any component color prop like any other token. minimal and consulting define them; devportal and vermilion do not — see Charts for what a theme that omits them produces.

No other key is accepted (additionalProperties: false).

Each value matches the pattern ^(#[0-9A-Fa-f]{6}|[a-zA-Z][a-zA-Z0-9]*)$ — either a #RRGGBB hex value or the name of another theme color. Name references are resolved recursively at render time (so "border": "backgroundSecondary" is valid); unknown names throw during generation. Because the second alternative is a name, a digit-leading bare hex (00FF00) is not expressible: it matches neither alternative and fails validation. A letter-leading one (AABBCC) passes the pattern, and resolveColor falls back to reading it as hex once no token by that name is found — no theme color name is six hex characters, so the two never collide. Always write the # regardless: it is unambiguous and works for both leading digits and letters.

fonts

Exactly four required slots — heading, body, mono, light — each a font definition:

Field	Type	Required	Description
family	string	yes	Font family name (see Fonts for safe families and registration).
size	number (8–72)	no	Size in points.
color	string	no	Hex or theme color token.
bold	boolean	no	Equivalent to fontWeight: 700.
fontWeight	integer (100–900)	no	Numeric weight; wins over bold when both are set.
italic	boolean	no	—
underline	boolean	no	—
lineSpacing	object	no	{ "type": "single" | "atLeast" | "exactly" | "double" | "multiple", "value"?: number }
spacing	object	no	{ "before"?: number, "after"?: number } (points, ≥ 0).
characterSpacing	object	no	{ "type": "condensed" | "expanded", "value": number }

page

Field	Type	Required	Description
size	string or object	yes	One of "A4", "A3", "LETTER", "LEGAL", or a custom { "width": number, "height": number } in twips.
margins	object	yes	All seven keys required, numbers ≥ 0, in twips: top, bottom, left, right, header, footer, gutter.

Twips

Word measures in twips: 1 twip = 1/20 pt, so 1440 twips = 1 inch and 720 = 0.5 inch.

styles

Known keys: normal, heading1–heading6, title, subtitle (regular style properties) and TOC1–TOC6 (TOC style properties). Arbitrary custom style names are also allowed and can be referenced from paragraphs via themeStyle.

Regular style properties = all the text-formatting fields from the font definition table above, plus:

Field	Type	Description
font	"heading" | "body" | "mono" | "light"	Reference into theme.fonts.
alignment	"left" | "center" | "right" | "justify"	Paragraph alignment.
priority	number	Ordering in Word's style gallery.
baseStyle	string	Name of a style to inherit from (chains are resolved).
followingStyle	string	Style applied to the next paragraph when the user presses Enter in Word.
widowControl	boolean	Prevent widow/orphan lines.
keepNext	boolean	Keep with the following paragraph.
keepLinesTogether	boolean	Keep all lines on one page.
outlineLevel	number	Outline level for navigation/TOC collection.
borders	object	Per-side (top/bottom/left/right) plus between, each { "style", "size", "color", "space"? }. size is in eighths of a point; style is one of the 27 Word border styles (e.g. single, double, dashed, dotted, thick, ...). between is the rule Word draws between consecutive paragraphs sharing this style, in place of their adjoining bottom and top edges.
indent	object	Paragraph indentation.

TOC styles (TOC1–TOC6) deliberately exclude baseStyle and add one field:

Field	Type	Description
tabStops	array	Each entry: { "type", "position", "leader" }. position is in twips or the string "max" (= 9026, the right page edge); leader is "dot" | "hyphen" | "middleDot" | "none" | "underscore". Default: [{ "type": "right", "position": "max", "leader": "none" }] — the classic right-aligned page number.

componentDefaults

Optional per-component prop defaults. Allowed keys: heading, paragraph, image, statistic, table, section, columns, list. Values are partial props objects for the matching component — see DOCX components. Document-level props.componentDefaults deep-merges on top; props on the component itself win over both.

Complete minimal example

A valid theme with all required fields plus a small styles and componentDefaults block (colors and margins from the built-in minimal theme):

{
  "$schema": "./json-schemas/theme.schema.json",
  "name": "brand",
  "displayName": "Brand Theme",
  "description": "House style for generated reports",
  "version": "2.0.0",
  "colors": {
    "primary": "#000000",
    "secondary": "#666666",
    "accent": "#2c3e50",
    "background": "#ffffff",
    "text": "#2c2c2c",
    "border": "#f0f0f0",
    "textPrimary": "#000000",
    "textSecondary": "#4a4a4a",
    "textMuted": "#999999",
    "borderPrimary": "#e0e0e0",
    "borderSecondary": "#f5f5f5",
    "backgroundPrimary": "#ffffff",
    "backgroundSecondary": "#fafafa"
  },
  "fonts": {
    "heading": { "family": "Arial", "size": 24 },
    "body": { "family": "Arial", "size": 11 },
    "mono": { "family": "Menlo", "size": 10 },
    "light": { "family": "Arial", "size": 24 }
  },
  "page": {
    "size": "A4",
    "margins": {
      "top": 1440,
      "bottom": 1440,
      "left": 1080,
      "right": 1080,
      "header": 720,
      "footer": 720,
      "gutter": 0
    }
  },
  "styles": {
    "normal": {
      "font": "body",
      "lineSpacing": { "type": "multiple", "value": 1.5 },
      "alignment": "justify",
      "spacing": { "after": 9 }
    },
    "heading1": {
      "font": "light",
      "size": 24,
      "color": "primary",
      "spacing": { "before": 18, "after": 12 },
      "keepNext": true
    }
  },
  "componentDefaults": {
    "table": { "hideBorders": true, "cellDefaults": { "padding": 4 } },
    "list": { "format": "bullet" }
  }
}

Runtime defaults

When a theme is loaded programmatically, missing optional pieces are filled from built-in defaults (normal at 11 pt, heading1 24 pt bold down to heading6 11 pt bold, LETTER page with 720-twip margins, and a default color/font set). A theme file must still pass the schema — the defaults matter mostly for partial ThemeConfig objects created in code.

PPTX theme

Also accepts optional displayName, description, version and the shared visual layers. fonts.mono and fonts.light are optional family strings for type roles.

A PPTX theme is a plain object, most often supplied inline on the presentation's props.theme (see Themes & styling). Unknown top-level properties are rejected (additionalProperties: false). jto pptx schemas emits a PPTX theme.schema.json generated from this ThemeConfig schema — the format parent determines which theme schema is generated (see JSON schemas).

Field	Type	Required	Description
name	string	yes	Theme name.
colors	object	yes	The 10-slot scheme (below).
fonts	object	yes	{ "heading": string, "body": string } — plain family-name strings, no size/weight here.
defaults	object	yes	{ "fontSize": number, "fontColor": string } — base font size in points and base color (hex).
styles	object	no	Partial map of the seven style names (below).
componentDefaults	object	no	Per-component prop defaults (below).

colors

Slot	Required
primary, secondary, accent, background, text	yes
text2, background2, accent4, accent5, accent6	no

Values are strict hex matching ^#?[0-9A-Fa-f]{6}$ (leading # optional). Unlike DOCX, palette values cannot reference other color names — token indirection happens only where components consume colors. An unset optional slot resolves to primary at render time, with a THEME_COLOR_FALLBACK warning, whenever something names the token explicitly; the implicit chart palette skips it instead (below).

accent4–accent6 carry the same names in the DOCX scheme so the chart palette reads one token list in both formats, and both formats skip an unfilled slot identically — the palette shrinks, no warning. Only the PPTX built-ins ship values for them. See Charts.

styles

A partial map — override any subset of: title, subtitle, heading1, heading2, heading3, body, caption. Each value is a text style:

Field	Type	Description
fontSize	number	Points.
fontFace	string	Font family name.
fontColor	string	Hex, a semantic token (primary, text2, ...), or a PowerPoint alias (accent1, tx1, ...).
bold	boolean	—
fontWeight	integer (100–900)	Wins over bold when both are set.
italic	boolean	—
align	"left" | "center" | "right" | "justify"	—
lineSpacing	number	—
charSpacing	number	Points; positive = wider.
paraSpaceAfter	number	Space after paragraph, points.

componentDefaults

Allowed keys: text, image, shape, table, highcharts, chart (extra keys are tolerated, as in the DOCX equivalent). See PPTX components and PPTX charts for the props each accepts.

Example

{
  "name": "brand",
  "colors": {
    "primary": "#0C2340",
    "secondary": "#1B3A5C",
    "accent": "#D4A843",
    "background": "#FFFFFF",
    "text": "#1A1A1A",
    "text2": "#5A6B7C",
    "background2": "#F3F5F7",
    "accent4": "#8A9BAA",
    "accent5": "#C4A35A",
    "accent6": "#2E4A66"
  },
  "fonts": { "heading": "Georgia", "body": "Calibri" },
  "defaults": { "fontSize": 18, "fontColor": "#1A1A1A" },
  "styles": {
    "title": {
      "fontSize": 40,
      "bold": true,
      "fontColor": "primary",
      "align": "left"
    },
    "caption": { "fontSize": 10, "italic": true, "fontColor": "text2" }
  },
  "componentDefaults": {
    "table": { "fontSize": 12 }
  }
}

Slide grid

The grid used to position slide content (default 12 columns × 6 rows) is configured separately from the theme — see Slides & grid.

Loading rules

DOCX theme files loaded from disk (CLI --theme-path, or loadThemeFromFile in the library) pass through a hardened loader:

• .json extension only — anything else is rejected. (--theme-path alternatively accepts a JS/TS module that exports the theme as default or theme; that path bypasses the JSON loader.)
• 10 MB maximum file size.
• Path guards — rejects .. traversal segments, null bytes, and paths longer than 1000 characters.
• Empty files are rejected.
• Content is validated against the theme schema (TypeBox), then runtime defaults are applied.

PPTX theme files given to the CLI are read as plain JSON — without the hardened loader or schema validation.

Loaded custom themes are registered under their sanitized theme.name, which is what the document's props.theme must reference. (The --theme flag currently takes effect only in plugin-loaded runs — see the CLI reference.)

Validate a theme file without generating anything:

jto docx validate ./brand.docx.theme.json

The validator auto-detects theme files (an object with colors/fonts/styles and no name: "docx" root is treated as a theme). See Validation.