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diff --git a/web/source/settings/lib/query/transforms.ts b/web/source/settings/lib/query/transforms.ts
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+/*
+	GoToSocial
+	Copyright (C) GoToSocial Authors admin@gotosocial.org
+	SPDX-License-Identifier: AGPL-3.0-or-later
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * Map a list of items into an object.
+ * 
+ * In the following example, a list of DomainPerms like the following:
+ * 
+ * ```json
+ * [
+ *   {
+ *     "domain": "example.org",
+ *     "public_comment": "aaaaa!!"
+ *   },
+ *   {
+ *     "domain": "another.domain",
+ *     "public_comment": "they are poo"
+ *   }
+ * ]
+ * ```
+ * 
+ * Would be converted into an Object like the following:
+ * 
+ * ```json
+ * {
+ *   "example.org": {
+ *     "domain": "example.org",
+ *     "public_comment": "aaaaa!!"
+ *   },
+ *   "another.domain": {
+ *     "domain": "another.domain",
+ *     "public_comment": "they are poo"
+ *   },
+ * }
+ * ```
+ * 
+ * If you pass a non-array type into this function it
+ * will be converted into an array first, as a treat.
+ * 
+ * @example
+ * const extended = gtsApi.injectEndpoints({
+ *   endpoints: (build) => ({
+ *     getDomainBlocks: build.query<MappedDomainPerms, void>({
+ *       query: () => ({
+ *         url: `/api/v1/admin/domain_blocks`
+ *       }),
+ *     transformResponse: listToKeyedObject<DomainPerm>("domain"),
+ *   }),
+ * });
+ */
+export function listToKeyedObject<T>(key: keyof T) {
+	return (list: T[] | T): { [_ in keyof T]: T } => {
+		// Ensure we're actually
+		// dealing with an array.
+		if (!Array.isArray(list)) {
+			list = [list];
+		}
+		
+		const entries = list.map((entry) => [entry[key], entry]); 
+		return Object.fromEntries(entries);
+	};
+}