diff -r a9a1d07a6840 -r 05910a8994f7 src/cx/json.h
--- a/src/cx/json.h	Sat Nov 02 19:27:45 2024 +0100
+++ b/src/cx/json.h	Sat Nov 02 19:37:59 2024 +0100
@@ -180,7 +180,39 @@
 void cxJsonDestroy(CxJson *json);
 
 __attribute__((__nonnull__))
-void cxJsonFill(CxJson *json, const char *buf, size_t len);
+int cxJsonFilln(CxJson *json, const char *buf, size_t len);
+
+#define cxJsonFill(prop, str) _Generic((str), \
+    cxstring: cx_json_fill_cxstr,             \
+    cxmutstr: cx_json_fill_mutstr,            \
+    char*: cx_json_fill_str,                  \
+    const char*: cx_json_fill_str)            \
+    (prop, str)
+
+__attribute__((__nonnull__))
+static inline int cx_json_fill_cxstr(
+        CxJson *json,
+        cxstring str
+) {
+    return cxJsonFilln(json, str.ptr, str.length);
+}
+
+__attribute__((__nonnull__))
+static inline int cx_json_fill_mutstr(
+        CxJson *json,
+        cxmutstr str
+) {
+    return cxJsonFilln(json, str.ptr, str.length);
+}
+
+__attribute__((__nonnull__))
+static inline int cx_json_fill_str(
+        CxJson *json,
+        const char *str
+) {
+    return cxJsonFilln(json, str, strlen(str));
+}
+
 
 __attribute__((__nonnull__))
 int cxJsonNext(CxJson *json, CxJsonValue **value);