diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index b2008b286ca25..1505399e1311c 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -2267,7 +2267,6 @@
     'OC_Defaults' => $baseDir . '/lib/private/legacy/OC_Defaults.php',
     'OC_Helper' => $baseDir . '/lib/private/legacy/OC_Helper.php',
     'OC_Hook' => $baseDir . '/lib/private/legacy/OC_Hook.php',
-    'OC_JSON' => $baseDir . '/lib/private/legacy/OC_JSON.php',
     'OC_Template' => $baseDir . '/lib/private/legacy/OC_Template.php',
     'OC_User' => $baseDir . '/lib/private/legacy/OC_User.php',
     'OC_Util' => $baseDir . '/lib/private/legacy/OC_Util.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index fb4a73103f5b3..444173f5ca9a8 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -2308,7 +2308,6 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC_Defaults' => __DIR__ . '/../../..' . '/lib/private/legacy/OC_Defaults.php',
         'OC_Helper' => __DIR__ . '/../../..' . '/lib/private/legacy/OC_Helper.php',
         'OC_Hook' => __DIR__ . '/../../..' . '/lib/private/legacy/OC_Hook.php',
-        'OC_JSON' => __DIR__ . '/../../..' . '/lib/private/legacy/OC_JSON.php',
         'OC_Template' => __DIR__ . '/../../..' . '/lib/private/legacy/OC_Template.php',
         'OC_User' => __DIR__ . '/../../..' . '/lib/private/legacy/OC_User.php',
         'OC_Util' => __DIR__ . '/../../..' . '/lib/private/legacy/OC_Util.php',
diff --git a/lib/private/legacy/OC_JSON.php b/lib/private/legacy/OC_JSON.php
deleted file mode 100644
index 03ac83a058141..0000000000000
--- a/lib/private/legacy/OC_JSON.php
+++ /dev/null
@@ -1,109 +0,0 @@
-<?php
-
-/**
- * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
- * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-use OC\Authentication\TwoFactorAuth\Manager as TwoFactorAuthManager;
-use OCP\App\IAppManager;
-use OCP\AppFramework\Http;
-use OCP\IRequest;
-use OCP\IUserSession;
-use OCP\Server;
-
-class OC_JSON {
-	/**
-	 * Check if the app is enabled, send json error msg if not
-	 * @param string $app
-	 * @deprecated 12.0.0 Use the AppFramework instead. It will automatically check if the app is enabled.
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function checkAppEnabled($app) {
-		if (!Server::get(IAppManager::class)->isEnabledForUser($app)) {
-			$l = \OC::$server->getL10N('lib');
-			self::error([ 'data' => [ 'message' => $l->t('Application is not enabled'), 'error' => 'application_not_enabled' ]]);
-			exit();
-		}
-	}
-
-	/**
-	 * Check if the user is logged in, send json error msg if not
-	 * @deprecated 12.0.0 Use annotation based ACLs from the AppFramework instead
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function checkLoggedIn() {
-		$twoFactorAuthManger = Server::get(TwoFactorAuthManager::class);
-		if (!Server::get(IUserSession::class)->isLoggedIn()
-			|| $twoFactorAuthManger->needsSecondFactor(Server::get(IUserSession::class)->getUser())) {
-			$l = \OC::$server->getL10N('lib');
-			http_response_code(Http::STATUS_UNAUTHORIZED);
-			self::error([ 'data' => [ 'message' => $l->t('Authentication error'), 'error' => 'authentication_error' ]]);
-			exit();
-		}
-	}
-
-	/**
-	 * Check an ajax get/post call if the request token is valid, send json error msg if not.
-	 * @deprecated 12.0.0 Use annotation based CSRF checks from the AppFramework instead
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function callCheck() {
-		if (!Server::get(IRequest::class)->passesStrictCookieCheck()) {
-			header('Location: ' . \OC::$WEBROOT);
-			exit();
-		}
-
-		if (!Server::get(IRequest::class)->passesCSRFCheck()) {
-			$l = \OC::$server->getL10N('lib');
-			self::error([ 'data' => [ 'message' => $l->t('Token expired. Please reload page.'), 'error' => 'token_expired' ]]);
-			exit();
-		}
-	}
-
-	/**
-	 * Check if the user is a admin, send json error msg if not.
-	 * @deprecated 12.0.0 Use annotation based ACLs from the AppFramework instead
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function checkAdminUser() {
-		if (!OC_User::isAdminUser(OC_User::getUser())) {
-			$l = \OC::$server->getL10N('lib');
-			self::error([ 'data' => [ 'message' => $l->t('Authentication error'), 'error' => 'authentication_error' ]]);
-			exit();
-		}
-	}
-
-	/**
-	 * Send json error msg
-	 * @deprecated 12.0.0 Use a AppFramework JSONResponse instead
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function error($data = []) {
-		$data['status'] = 'error';
-		header('Content-Type: application/json; charset=utf-8');
-		echo self::encode($data);
-	}
-
-	/**
-	 * Send json success msg
-	 * @deprecated 12.0.0 Use a AppFramework JSONResponse instead
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function success($data = []) {
-		$data['status'] = 'success';
-		header('Content-Type: application/json; charset=utf-8');
-		echo self::encode($data);
-	}
-
-	/**
-	 * Encode JSON
-	 * @deprecated 12.0.0 Use a AppFramework JSONResponse instead
-	 *
-	 * @psalm-taint-escape has_quotes
-	 * @psalm-taint-escape html
-	 */
-	private static function encode($data) {
-		return json_encode($data, JSON_HEX_TAG);
-	}
-}