From d7b7f7100a4e8f505a5dab5be22cbe9b995d19bc Mon Sep 17 00:00:00 2001
From: wwenrr <qscvdefb@gmail.com>
Date: Wed, 1 Apr 2026 15:49:38 +0000
Subject: [PATCH] fix: preserve arrays for repeated query keys over 20 items

---
 lib/utils.js      |  3 ++-
 test/req.query.js | 11 +++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/utils.js b/lib/utils.js
index 4f21e7ef1e3..23c2101de51 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -266,6 +266,7 @@ function createETagGenerator (options) {
 
 function parseExtendedQueryString(str) {
   return qs.parse(str, {
-    allowPrototypes: true
+    allowPrototypes: true,
+    arrayLimit: 1000
   });
 }
diff --git a/test/req.query.js b/test/req.query.js
index c0d3c8376e9..2003bf0b3f8 100644
--- a/test/req.query.js
+++ b/test/req.query.js
@@ -38,6 +38,17 @@ describe('req', function(){
         .get('/?user.name=tj')
         .expect(200, '{"user.name":"tj"}', done);
       });
+
+      it('should parse repeated keys over 20 values as an array', function (done) {
+        var app = createApp('extended');
+        var query = Array.from({ length: 21 }, function (_, i) {
+          return 'tenancyIds=' + (i + 1)
+        }).join('&')
+
+        request(app)
+        .get('/?' + query)
+        .expect(200, '{"tenancyIds":["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21"]}', done);
+      });
     });
 
     describe('when "query parser" is simple', function () {