From e0ad3c46385945ff2754efdbacd463de244b9fdf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Frank=20M=C3=B6hle?=
 <91616163+softhack007@users.noreply.github.com>
Date: Sun, 5 Apr 2026 22:01:33 +0200
Subject: [PATCH] robustness improvement: rewind file before writing empty JSON
 skeleton

prevents creating corrupted JSON
if the previous file content was ``{}``, the result would be ``{"0":{}}`` if the file position is not reset first.
---
 wled00/file.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/wled00/file.cpp b/wled00/file.cpp
index 2480f110..2e75217c 100644
--- a/wled00/file.cpp
+++ b/wled00/file.cpp
@@ -226,6 +226,7 @@ bool appendObjectToFile(const char* key, JsonDocument* content, uint32_t s, uint
   if (f.size() < 4) { // file uninitialized -> write minimal skeleton
     char init[12];
     strcpy_P(init, PSTR("{\"0\":{}}"));
+    f.seek(0, SeekSet);           // rewind to ensure we overwrite from the start
     f.print(init);
   }