diff --git a/externs/tilejson.js b/externs/tilejson.js
new file mode 100644
index 0000000000..5927c479ee
--- /dev/null
+++ b/externs/tilejson.js
@@ -0,0 +1,95 @@
+/**
+ * @externs
+ * @see https://github.com/mapbox/tilejson-spec
+ */
+
+
+
+/**
+ * @constructor
+ */
+var TileJSON = function() {};
+
+
+/**
+ * @type {string}
+ */
+TileJSON.prototype.tilejson;
+
+
+/**
+ * @type {string|undefined}
+ */
+TileJSON.prototype.name;
+
+
+/**
+ * @type {string|undefined}
+ */
+TileJSON.prototype.description;
+
+
+/**
+ * @type {string|undefined}
+ */
+TileJSON.prototype.version;
+
+
+/**
+ * @type {string|undefined}
+ */
+TileJSON.prototype.attribution;
+
+
+/**
+ * @type {string|undefined}
+ */
+TileJSON.prototype.template;
+
+
+/**
+ * @type {string|undefined}
+ */
+TileJSON.prototype.legend;
+
+
+/**
+ * @type {string|undefined}
+ */
+TileJSON.prototype.scheme;
+
+
+/**
+ * @type {!Array.<string>}
+ */
+TileJSON.prototype.tiles;
+
+
+/**
+ * @type {!Array.<string>}
+ */
+TileJSON.prototype.grids;
+
+
+/**
+ * @type {number|undefined}
+ */
+TileJSON.prototype.minzoom;
+
+
+/**
+ * @type {number|undefined}
+ */
+TileJSON.prototype.maxzoom;
+
+
+/**
+ * @type {!Array.<number>|undefined}
+ */
+TileJSON.prototype.bounds;
+
+
+/**
+ * @type {!Array.<number>|undefined}
+ */
+TileJSON.prototype.center;