diff -r db8299984bfe -r 6a842bd49fea src/json.c
--- a/src/json.c	Mon Dec 22 15:47:59 2025 +0100
+++ b/src/json.c	Mon Dec 22 16:12:20 2025 +0100
@@ -1226,7 +1226,7 @@
 
                 // the name
                 actual += wfunc("\"", 1, 1, target);
-                cxstring key = cx_strn(member->key->data, member->key->len);
+                cxstring key = cx_hash_key_as_string(member->key);
                 cxmutstr name = escape_string(key, settings->escape_slash);
                 actual += wfunc(name.ptr, 1, name.length, target);
                 actual += wfunc("\"", 1, 1, target);