From 06e695469130a4fb4d7f6abbe7cbe861631d6b26 Mon Sep 17 00:00:00 2001
From: Lonercode <penpalclassmate@gmail.com>
Date: Fri, 7 Nov 2025 18:56:37 +0100
Subject: [PATCH] BUG: fix for pd.json_normalize on non string keys

---
 pandas/io/json/_normalize.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/io/json/_normalize.py b/pandas/io/json/_normalize.py
index 6194e699c12a8..b9162366bc68b 100644
--- a/pandas/io/json/_normalize.py
+++ b/pandas/io/json/_normalize.py
@@ -552,7 +552,7 @@ def _pull_records(js: dict[str, Any], spec: list | str) -> list:
     lengths = []
 
     meta_vals: DefaultDict = defaultdict(list)
-    meta_keys = [sep.join(val) for val in _meta]
+    meta_keys = [sep.join(map(str, val)) for val in _meta]
 
     def _recursive_extract(data, path, seen_meta, level: int = 0) -> None:
         if isinstance(data, dict):