Endpoints

All endpoints are GET (plus HEAD/OPTIONS), return JSON, and live under https://meta-api.leaguetoolkit.dev/v1. A trailing slash is tolerated on any route. Errors come back as JSON too - 404 responses include a hint and a pointer back to /v1. Class names are exact and case-sensitive; hashes are accepted in any spelling (see Names and hashes).

Discovery

Endpoint	Returns
/v1	API metadata: the dataset window (first and latest tracked patch/build), class and patch counts, hash format, and a map of every endpoint. Start here.
/v1/openapi	The OpenAPI 3.1 document describing every endpoint and schema - point a Swagger or Redoc viewer at it.

Classes

Endpoint	Returns
/v1/classes	The full class list: { count, classes: [name, …] }. Unnamed classes appear as canonical hashes.
/v1/classes/{name-or-hash}	One class: hash, interface/value flags, bases, lifetime, ancestor/descendant trees, and its own properties with types, defaults, and history.
/v1/classes/{name-or-hash}?inherited=1	The same class in the precomputed flattened view: properties from all ancestors merged in, each stamped with a from field.

Class shape

curl https://meta-api.leaguetoolkit.dev/v1/classes/VfxEmitterDefinitionData

{
  "name": "VfxEmitterDefinitionData",
  "hash": "0x09cde442",
  "interface": false,
  "value": true,
  "bases": [],
  "since": null,
  "removedIn": null,
  "properties": [
    {
      "name": "primitive",
      "hash": "0x007b14f6",
      "ft": "Pointer",
      "kt": null,
      "vt": null,
      "kh": "0x60c24094",
      "khName": null,
      "khKind": "class",
      "defaultValue": "{}"
    }
  ],
  "ancestorLevels": [],
  "descendantTree": []
}

Property type fields are the tuple the wiki renders: ft (field type), kt / vt (aux key/value types for containers and maps, null when not applicable), and the link target resolved three ways:

• kh - the canonical hash of the referenced type, or null when the property links nothing.
• khName - the resolved name, or null when unknown.
• khKind - what the hash is: "class" (fetchable via /v1/classes/{kh}), "external" (an engine type outside the dumped class set), or "unknown".

Properties whose type changed over time carry a history array of the same tuple with since/until patch bounds.

Dataset window: tracking begins at the dataset.firstPatch reported by /v1 (currently patch 13.15). since: null means already present when tracking began, not “has always existed”; since: "14.1" means the class or property first appeared in that patch.

Inheritance: by default properties lists only the class’s own properties, with the full ancestry in ancestorLevels (nearest level first) and subclasses in descendantTree. With ?inherited=1, properties from all ancestors are merged in (the nearest definition wins on a name conflict) and every property gains a from field naming the class that defines it.

Lookup tables

Endpoint	Returns
/v1/hashes	Canonical hash → resolved name for every class (null = unnamed) and external type. Use it to translate hashes and names in bulk.
/v1/index	Class name → absolute wiki page URL, for linking back to the site.
/v1/versions	The full patch ↔ build-number map, for translating the raw build numbers that appear in changelog entries and /v1/db.

Changelogs

Endpoint	Returns
/v1/changelog	Patch index, newest first, with per-patch change counts.
/v1/changelog/{slug}	Full changelog for one patch: classes and properties added, removed, or changed. The slug is the patch with a hyphen - 16-13 for patch 16.13.

Bulk download

Endpoint	Returns
/v1/db	The complete raw meta database in one download (~3.5 MB, ~700 KB compressed). Unpadded hashes, per-build revisions. Prefer the per-class endpoints unless you genuinely need everything.

Documentation

The endpoints above serve structural facts extracted from the game. Documentation endpoints add the community-written prose on top - fetch the facts for a class, then merge the prose in by property name.

Endpoint	Returns
/v1/docs	Which classes have written documentation: { count, classes: [name, …] }.
/v1/docs/{name-or-hash}	The prose for one class: { name, class: {…}, properties: { propName: {…} } }, where each entry holds description, notes, and examples.
/v1/docs/all	Every documented class’s prose in one download - for tools bundling a documentation snapshot.

curl https://meta-api.leaguetoolkit.dev/v1/docs/AbilityObject

{
  "name": "AbilityObject",
  "class": null,
  "properties": {
    "AbilityTraits": {
      "description": "Gameplay-behavior tags for the ability…",
      "notes": ["Stored as a 4-byte (`U32`) bitmask."]
    }
  }
}

Prose also updates on a different cadence than facts: facts change only when a game patch is ingested, while prose changes whenever a documentation PR is merged. Note that /v1/docs* is the only surface serving licensed human-authored content - see Licensing if you redistribute it.