open api spec link

application/Espo/Resources/i18n/en_US/ApiUser.json

@@ -1,5 +1,6 @@
 {
     "labels": {
-        "Create ApiUser": "Create API User"
+        "Create ApiUser": "Create API User",
+        "OpenAPI spec": "OpenAPI spec"
     }
 }

application/Espo/Resources/metadata/clientDefs/ApiUser.json

@@ -30,5 +30,18 @@
     },
     "filterList": [
     ],
-    "boolFilterList": []
-}
+    "boolFilterList": [],
+    "menu": {
+        "list": {
+            "dropdown": [
+                {
+                    "name": "openApiSpec",
+                    "label": "OpenAPI spec",
+                    "link": "api/v1/OpenApi",
+                    "handler": "handlers/api-user/open-api-spec-action",
+                    "actionFunction": "process"
+                }
+            ]
+        }
+    }
+}

client/src/handlers/api-user/open-api-spec-action.js

@@ -0,0 +1,46 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+import ActionHandler from 'action-handler';
+import {inject} from 'di';
+import Router from 'router';
+
+// noinspection JSUnusedGlobalSymbols
+export default class extends ActionHandler {
+
+    /**
+     * @type {Router}
+     * @private
+     */
+    @inject(Router)
+    router
+
+    process() {
+        window.open('api/v1/OpenApi', '_blank');
+    }
+}