WorldFormat

📐 World Data Format

This is the reference for a Formamorph world — the .json you export from the editor, import in the main menu, or ship as a built-in. If you author worlds by hand or tooling, this page describes every field the app reads.

💡 You rarely need to write this by hand — the in-app World Editor produces and consumes this format for you. This page is for understanding imports/exports and for external tooling.

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🗂️ How worlds are stored

Worlds live in the browser's IndexedDB:

Database	worldsDB
Store	worlds
Key path	id

A world is exported/imported as a single JSON object. The main-menu grid reads a lightweight preview (id, name, description, author, thumbnail, tags) without loading the full payload.

🔖 Versioning

Every world saved or exported by Formamorph 2.0+ carries a top-level version string (e.g. "2.0.0"). On import, worlds that don't match the current version are run through a migration that upgrades them to the current shape — so anything reaching the editor is already compatible.

Field	Type	Notes
version	String	App/world format version. Absent ⇒ treated as legacy (pre-2.0) and migrated on import.

⚠️ Older (v1.x) worlds stored the custom player model at the top level as customPlayerVRM. Migration moves it into worldOverview.customPlayerVRM and stamps the current version. You don't need to do this yourself — import handles it.

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🧱 Top-level structure

Field	Type	Description
id	String	Unique identifier for the world
version	String	Format version (see above)
worldOverview	Object	General world info & presentation
stats	Array	Game mechanics tracked during play
locations	Array	Places the player can visit
entities	Array	Characters/objects the player can interact with
traits	Array	Selectable characteristics that modify stats
statUpdates	Array	Rules the AI uses to change stats during play
dictionary	Array	Lore keywords injected into the AI prompt on match

🌍 worldOverview

Field	Type	Description
name	String	Display name
description	String	Detailed description
author	String	Creator
thumbnail	String | null	Data-URL image for the menu card
bgm	String | null	Data-URL audio for background music
systemPrompt	String	Extra context handed to the AI
use3DModel	Boolean	Whether the world uses a 3D VRM avatar
tags	String[]	Tags shown/searchable in the world browser
customPlayerVRM	MediaAsset | null	Optional per-world custom player .vrm

📊 stats

Each stat is a tracked mechanic. Two kinds exist, set by type:

Field	Type	Description
id	String	Unique identifier
name	String	Display name (referenced by stat code, by name)
type	"number" | "list"	Numeric gauge, or a list of items
description	String	What the stat represents
min / max	Number	Value bounds (numeric stats)
starting	Number	Initial value at game start
value	Number | StatListItem[]	Live value — a number for number stats, items for list stats
regen	Number	Amount regenerated per time unit
descriptors	Array	Threshold-based descriptions (below)
code	String	Optional JS deriving this stat from others — see the Stat Code Guide
noIncrease / noDecrease	Boolean	Stop the AI from raising/lowering the current value
noIncreaseMax / noDecreaseMax	Boolean	Stop the AI from raising/lowering the max

Stat descriptors

descriptors map value thresholds to flavor text the AI sees:

Field	Type	Description
id	String | Number	Unique identifier
threshold	Number	Value at/under which this descriptor applies
description	String	Text for the stat at this level

Stat list items

For type: "list" stats, value is an array of:

Field	Type	Description
id	String | Number	Unique identifier
name	String	Item name
description	String	Item description
number	Number	Quantity/weight of this item

🎭 traits

Selectable characteristics that adjust stats at character creation.

Field	Type	Description
id	String	Unique identifier
name	String	Display name
description	String	What the trait does
statChanges	StatChange[]	How it modifies stats

Stat changes

Field	Type	Description
statId	String	Target stat's id
value	Number	Amount applied
type	"min" | "max" | "starting" | "regen"	Which facet of the stat the trait modifies

🗺️ locations

Field	Type	Description
id	String	Unique identifier
name	String	Display name
inGameDescription	String	Short text shown in play
detailedDescription	String	Longer context for the AI
description	String	Legacy fallback when inGameDescription is absent
backgroundImage	String	Data-URL background image
ambientSound	MediaAsset	Looping ambient audio
entities	String[]	ids of entities present here
connections	String[]	Names of connected locations (shown in the location panel)
isStarting	Boolean	A candidate start location — one is chosen at random on a new game

👥 entities

Characters or objects in the world.

Field	Type	Description
id	String	Unique identifier
name	String	Display name
type	String	Optional category label
inGameDescription	String	Short text shown in play
detailedDescription	String	Longer context for the AI
image	String	Data-URL portrait
sound	MediaAsset	Associated sound
model	MediaAsset	Associated 3D model

🔄 statUpdates

Rules the AI evaluates during play to change stats.

Field	Type	Description
id	String	Unique identifier
name	String	Display name of the rule
prompt	String	Prompt sent to the AI to evaluate this update
stats	String[]	Names of the stats this update may change
messageHistory	Array	Message records for this update

📖 dictionary

Lore entries injected into the AI prompt when a keyword appears in play (a lightweight world-info / lorebook).

Field	Type	Description
id	String	Unique identifier
name	String	Display label (mirrors key)
key	String	Comma-separated trigger keywords
value	String	Content injected when a keyword matches

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🎞️ Media fields

Images (thumbnail, bgm, location backgroundImage, entity image) are stored as base64 data-URL strings, e.g. data:image/png;base64,....

Uploaded audio/model assets (customPlayerVRM, location ambientSound, entity sound/model) are a MediaAsset object that pairs the data with its MIME type:

{ "data": "data:model/vrm;base64,...", "type": "model/vrm" }

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🧪 Example world

A trimmed example showing the shape (media payloads abbreviated):

{
  "id": "example-world",
  "version": "2.0.0",
  "worldOverview": {
    "name": "Example World",
    "description": "A sample world demonstrating the data format",
    "author": "Documentation Team",
    "thumbnail": "data:image/png;base64,...",
    "bgm": "data:audio/mp3;base64,...",
    "systemPrompt": "A fantasy world of magic and adventure.",
    "use3DModel": true,
    "tags": ["fantasy", "adventure"],
    "customPlayerVRM": { "data": "data:model/vrm;base64,...", "type": "model/vrm" }
  },
  "stats": [
    {
      "id": "health",
      "name": "Health",
      "type": "number",
      "description": "Your physical wellbeing",
      "min": 0,
      "max": 100,
      "starting": 100,
      "regen": 1,
      "descriptors": [
        { "id": "hp-low", "threshold": 30, "description": "You are severely injured" },
        { "id": "hp-high", "threshold": 100, "description": "You are in perfect health" }
      ],
      "code": ""
    }
  ],
  "traits": [
    {
      "id": "strong",
      "name": "Strong",
      "description": "Above-average physical strength",
      "statChanges": [{ "statId": "strength", "value": 20, "type": "starting" }]
    }
  ],
  "locations": [
    {
      "id": "town",
      "name": "Town Square",
      "inGameDescription": "The central gathering place",
      "backgroundImage": "data:image/png;base64,...",
      "entities": ["shopkeeper"],
      "connections": ["Market", "Tavern"],
      "isStarting": true
    }
  ],
  "entities": [
    {
      "id": "shopkeeper",
      "name": "Friendly Shopkeeper",
      "type": "npc",
      "inGameDescription": "Sells various goods"
    }
  ],
  "statUpdates": [
    {
      "id": "hunger-decay",
      "name": "Hunger Over Time",
      "prompt": "Increase hunger gradually as time passes.",
      "stats": ["Hunger"],
      "messageHistory": []
    }
  ],
  "dictionary": [
    {
      "id": "lore-1",
      "name": "ancient war, the war",
      "key": "ancient war, the war",
      "value": "A centuries-old conflict that shaped the kingdom."
    }
  ]
}