From 0a99abd63f73f1e771aa49938412ea5a6ce6339e Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Wed, 11 Feb 2026 17:57:39 -0600
Subject: [PATCH] Fix Arduino build: use length() instead of empty()

Arduino String has isEmpty() not empty(). Use length() > 0
which works on both std::string and Arduino String.
---
 esphome/components/web_server/web_server.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/components/web_server/web_server.h b/esphome/components/web_server/web_server.h
index 889297922c..b08ef30bdc 100644
--- a/esphome/components/web_server/web_server.h
+++ b/esphome/components/web_server/web_server.h
@@ -558,7 +558,7 @@ class WebServer : public Controller,
   template<typename T, typename Ret>
   void parse_bool_param_(AsyncWebServerRequest *request, ParamNameType param_name, T &call, Ret (T::*setter)(bool)) {
     const auto &param_value = request->arg(param_name);
-    if (!param_value.empty()) {
+    if (param_value.length() > 0) {
       // First check on/off (default), then true/false (custom)
       auto val = parse_on_off(param_value.c_str());
       if (val == PARSE_NONE) {