add validator in pages.js this validation failed

src/server/routes/apiv3/pages.js

@@ -4,9 +4,10 @@ const logger = loggerFactory('growi:routes:apiv3:pages'); // eslint-disable-line
 
 const express = require('express');
 
-
 const router = express.Router();
 
+const { query } = require('express-validator');
+
 
 /**
  * @swagger
@@ -21,6 +22,20 @@ module.exports = (crowi) => {
 
   const Page = crowi.model('Page');
 
+  const validator = {
+    displayList: [
+      query('pageLimitationS').custom((value) => {
+        if (value === undefined) {
+          return 10;
+        }
+        if (value > 100) {
+          throw new Error('You should set less than 100 or not to set pageLimitationS.');
+        }
+        return value;
+      }),
+    ],
+  };
+
   /**
    * @swagger
    *
@@ -84,13 +99,13 @@ module.exports = (crowi) => {
     }
   });
 
-  router.get('/list', accessTokenParser, loginRequired, async(req, res) => {
-    const limit = req.query.pageLimitationS || await crowi.configManager.getConfig('crowi', 'customize:showPageLimitationS') || 10;
+  router.get('/list', accessTokenParser, loginRequired, validator.displayList, async(req, res) => {
+    const pageLimitationS = req.query.pageLimitationS || await crowi.configManager.getConfig('crowi', 'customize:showPageLimitationS') || 10;
     const { path } = req.query;
     const selectedPage = req.query.activePage;
-    const offset = (selectedPage - 1) * limit;
+    const offset = (selectedPage - 1) * pageLimitationS;
 
-    const queryOptions = { offset, limit };
+    const queryOptions = { offset, limit: pageLimitationS };
 
     try {
       const result = await Page.findListWithDescendants(path, req.user, queryOptions);